Exemple #1
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    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = afwImage.readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwImage.makeWcs(maskedImageMD)
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        self.exposureCrWcs = afwImage.ExposureF(
            100, 100, self.wcs)  # n.b. the (100, 100, ...) form
        self.exposureCrOnly = afwImage.ExposureF(afwGeom.ExtentI(
            100, 100))  # test with ExtentI(100, 100) too

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        filterPolicy = pexPolicy.Policy()
        filterPolicy.add("lambdaEff", 470.0)
        afwImage.Filter.define(afwImage.FilterProperty("g", filterPolicy))
Exemple #2
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    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwGeom.makeSkyWcs(maskedImageMD, False)
        self.md = maskedImageMD
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector
        self.extras = {"misc": DummyPsf(3.5)}

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        # n.b. the (100, 100, ...) form
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)
        # test with ExtentI(100, 100) too
        self.exposureCrOnly = afwImage.ExposureF(lsst.geom.ExtentI(100, 100))

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        defineFilter("g", 470.0)
Exemple #3
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 def cmpExposure(self, e1, e2):
     self.assertEqual(e1.getDetector().getName(), e2.getDetector().getName())
     self.assertEqual(e1.getDetector().getSerial(), e2.getDetector().getSerial())
     self.assertEqual(e1.getFilter().getName(), e2.getFilter().getName())
     xy = afwGeom.Point2D(0, 0)
     self.assertEqual(e1.getWcs().pixelToSky(xy)[0], e2.getWcs().pixelToSky(xy)[0])
     self.assertEqual(e1.getCalib().getExptime(), e2.getCalib().getExptime())
     # check PSF identity
     if not e1.getPsf():
         self.assertFalse(e2.getPsf())
     else:
         psf1 = DummyPsf.swigConvert(e1.getPsf())
         psf2 = DummyPsf.swigConvert(e2.getPsf())
         self.assertEqual(psf1.getValue(), psf2.getValue())
Exemple #4
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 def cmpExposure(self, e1, e2):
     self.assertEqual(e1.getDetector().getName(), e2.getDetector().getName())
     self.assertEqual(e1.getDetector().getSerial(), e2.getDetector().getSerial())
     self.assertEqual(e1.getFilter().getName(), e2.getFilter().getName())
     xy = afwGeom.Point2D(0, 0)
     self.assertEqual(e1.getWcs().pixelToSky(xy)[0], e2.getWcs().pixelToSky(xy)[0])
     self.assertEqual(e1.getCalib(), e2.getCalib())
     # check PSF identity
     if not e1.getPsf():
         self.assertFalse(e2.getPsf())
     else:
         psf1 = DummyPsf.swigConvert(e1.getPsf())
         psf2 = DummyPsf.swigConvert(e2.getPsf())
         self.assertEqual(psf1.getValue(), psf2.getValue())
Exemple #5
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 def setUp(self):
     np.random.seed(1)
     schema = lsst.afw.table.ExposureTable.makeMinimalSchema()
     self.ka = schema.addField("a", type=float, doc="doc for a")
     self.kb = schema.addField("b", type=int, doc="doc for b")
     self.cat = lsst.afw.table.ExposureCatalog(schema)
     self.wcs = self.createWcs()
     self.psf = DummyPsf(2.0)
     self.bbox0 = lsst.afw.geom.Box2I(
         lsst.afw.geom.Box2D(
             self.wcs.getPixelOrigin() - lsst.afw.geom.Extent2D(5.0, 4.0),
             self.wcs.getPixelOrigin() +
             lsst.afw.geom.Extent2D(20.0, 30.0)))
     self.bbox1 = lsst.afw.geom.Box2I(
         lsst.afw.geom.Box2D(
             self.wcs.getPixelOrigin() - lsst.afw.geom.Extent2D(15.0, 40.0),
             self.wcs.getPixelOrigin() + lsst.afw.geom.Extent2D(3.0, 6.0)))
     self.calib = lsst.afw.image.Calib()
     self.calib.setFluxMag0(56.0, 2.2)
     self.visitInfo = self.createVisitInfo()
     record0 = self.cat.addNew()
     record0.setId(1)
     record0.set(self.ka, np.pi)
     record0.set(self.kb, 4)
     record0.setBBox(self.bbox0)
     record0.setPsf(self.psf)
     record0.setWcs(self.wcs)
     record0.setCalib(self.calib)
     record0.setVisitInfo(self.visitInfo)
     record1 = self.cat.addNew()
     record1.setId(2)
     record1.set(self.ka, 2.5)
     record1.set(self.kb, 2)
     record1.setWcs(self.wcs)
     record1.setBBox(self.bbox1)
Exemple #6
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    def setUp(self):
        super().setUp()

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()
        defineFilter("g", 470.0)

        self.wcs = afwGeom.makeSkyWcs(
            lsst.geom.Point2D(0.0, 0.0),
            lsst.geom.SpherePoint(2.0, 34.0, lsst.geom.degrees),
            np.identity(2),
        )
        self.photoCalib = afwImage.PhotoCalib(1.5)
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector
        self.summaryStats = afwImage.ExposureSummaryStats(ra=100.0)
        self.polygon = afwGeom.Polygon(
            lsst.geom.Box2D(lsst.geom.Point2D(0.0, 0.0),
                            lsst.geom.Point2D(25.0, 20.0)))
        self.coaddInputs = afwImage.CoaddInputs()
        self.apCorrMap = afwImage.ApCorrMap()
        self.transmissionCurve = afwImage.TransmissionCurve.makeIdentity()

        self.exposureInfo = afwImage.ExposureInfo()
        gFilter = afwImage.Filter("g")
        gFilterLabel = afwImage.FilterLabel(band="g")
        self.exposureInfo.setFilter(gFilter)
        self.exposureInfo.setFilterLabel(gFilterLabel)
Exemple #7
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    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(self.detector)

        subBBox = afwGeom.Box2I(afwGeom.Point2I(10, 10),
                                afwGeom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(mainExposure, subBBox,
                                           afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)

        subExposure = afwImage.ExposureF(inFilePathSmall, subBBox,
                                         afwImage.LOCAL)

        self.checkWcs(mainExposure, subExposure)

        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)

        self.assertRaises(lsst.afw.fits.FitsError, getExposure)

        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        mainExposure.getCalib().setExptime(10)
        mainExposure.getCalib().setMidTime(dafBase.DateTime())
        midMjd = mainExposure.getCalib().getMidTime().get()
        fluxMag0, fluxMag0Err = 1e12, 1e10
        mainExposure.getCalib().setFluxMag0(fluxMag0, fluxMag0Err)

        with utilsTests.getTempFilePath(".fits") as tmpFile:
            mainExposure.writeFits(tmpFile)

            readExposure = type(mainExposure)(tmpFile)

            #
            # Check the round-tripping
            #
            self.assertEqual(mainExposure.getFilter().getName(),
                             readExposure.getFilter().getName())

            self.assertEqual(mainExposure.getCalib().getExptime(),
                             readExposure.getCalib().getExptime())
            self.assertEqual(midMjd,
                             readExposure.getCalib().getMidTime().get())
            self.assertEqual((fluxMag0, fluxMag0Err),
                             readExposure.getCalib().getFluxMag0())

            psf = readExposure.getPsf()
            self.assert_(psf is not None)
            dummyPsf = DummyPsf.swigConvert(psf)
            self.assert_(dummyPsf is not None)
            self.assertEqual(dummyPsf.getValue(), self.psf.getValue())
Exemple #8
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    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(self.detector)
        exposure.setFilter(afwImage.Filter("g"))

        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter().getName(), "g")

        try:
            exposure.getWcs()
        except pexExcept.Exception as e:
            print("caught expected exception (getWcs): %s" % e)
            pass
        #
        # Test the Calib member.  The Calib tests are in color.py, here we just check that it's in Exposure
        #
        calib = exposure.getCalib()
        fluxMag0, FluxMag0Err = 1.1e12, 2.2e10
        calib.setFluxMag0(fluxMag0, FluxMag0Err)
        self.assertEqual(exposure.getCalib().getFluxMag0(),
                         (fluxMag0, FluxMag0Err))
        #
        # now check that we can set Calib
        #
        calib = afwImage.Calib()
        fluxMag0_2, fluxMag0Err_2 = (511.1, 44.4)
        calib.setFluxMag0(fluxMag0_2, fluxMag0Err_2)

        exposure.setCalib(calib)

        self.assertEqual(exposure.getCalib().getFluxMag0(),
                         (fluxMag0_2, fluxMag0Err_2))
        #
        # Psfs next
        #
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0))  # we can reset the Psf

        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
Exemple #9
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    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(self.detector)
        exposure.setFilter(afwImage.Filter("g"))
        exposure.setFilterLabel(afwImage.FilterLabel(band="g"))

        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter().getName(), "g")
        self.assertEqual(exposure.getFilterLabel().bandLabel, "g")
        self.assertEqual(exposure.getWcs(), self.wcs)

        # The PhotoCalib tests are in test_photoCalib.py;
        # here we just check that it's gettable and settable.
        self.assertIsNone(exposure.getPhotoCalib())

        photoCalib = afwImage.PhotoCalib(511.1, 44.4)
        exposure.setPhotoCalib(photoCalib)
        self.assertEqual(exposure.getPhotoCalib(), photoCalib)

        # Psfs next
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0))  # we can reset the Psf

        # extras next
        info = exposure.getInfo()
        for key, value in self.extras.items():
            self.assertFalse(info.hasComponent(key))
            self.assertIsNone(info.getComponent(key))
            info.setComponent(key, value)
            self.assertTrue(info.hasComponent(key))
            self.assertEqual(info.getComponent(key), value)
            info.removeComponent(key)
            self.assertFalse(info.hasComponent(key))

        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
Exemple #10
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    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(self.detector)
        
        subBBox = afwGeom.Box2I(afwGeom.Point2I(10, 10), afwGeom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(mainExposure, subBBox, afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)
        
        subExposure = afwImage.ExposureF(inFilePathSmall, subBBox, afwImage.LOCAL)
        
        self.checkWcs(mainExposure, subExposure)
        
        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)
        
        self.assertRaises(lsst.afw.fits.FitsError, getExposure)
        
        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        mainExposure.getCalib().setExptime(10)
        mainExposure.getCalib().setMidTime(dafBase.DateTime())
        midMjd = mainExposure.getCalib().getMidTime().get()
        fluxMag0, fluxMag0Err = 1e12, 1e10
        mainExposure.getCalib().setFluxMag0(fluxMag0, fluxMag0Err)

        with utilsTests.getTempFilePath(".fits") as tmpFile:
            mainExposure.writeFits(tmpFile)

            readExposure = type(mainExposure)(tmpFile)

            #
            # Check the round-tripping
            #
            self.assertEqual(mainExposure.getFilter().getName(), readExposure.getFilter().getName())

            self.assertEqual(mainExposure.getCalib().getExptime(), readExposure.getCalib().getExptime())
            self.assertEqual(midMjd, readExposure.getCalib().getMidTime().get())
            self.assertEqual((fluxMag0, fluxMag0Err), readExposure.getCalib().getFluxMag0())

            psf = readExposure.getPsf()
            self.assert_(psf is not None)
            dummyPsf = DummyPsf.swigConvert(psf)
            self.assert_(dummyPsf is not None)
            self.assertEqual(dummyPsf.getValue(), self.psf.getValue())
Exemple #11
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    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(self.detector)
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.setPsf(DummyPsf(4.0))

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)
Exemple #12
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    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(cameraGeom.Detector(cameraGeom.Id(666)))
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.getCalib().setExptime(666)
        exposureU.setPsf(DummyPsf(4.0))

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)
Exemple #13
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    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall, allowUnsafe=True)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(self.detector)
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.setPsf(DummyPsf(4.0))
        infoU = exposureU.getInfo()
        for key, value in self.extras.items():
            infoU.setComponent(key, value)

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)
 def setUp(self):
     np.random.seed(1)
     schema = lsst.afw.table.ExposureTable.makeMinimalSchema()
     self.ka = schema.addField("a", type=np.float64, doc="doc for a")
     self.kb = schema.addField("b", type=np.int64, doc="doc for b")
     self.cat = lsst.afw.table.ExposureCatalog(schema)
     self.wcs = self.createWcs()
     self.psf = DummyPsf(2.0)
     self.bbox0 = lsst.geom.Box2I(
         lsst.geom.Box2D(
             self.wcs.getPixelOrigin() - lsst.geom.Extent2D(5.0, 4.0),
             self.wcs.getPixelOrigin() + lsst.geom.Extent2D(20.0, 30.0)
         )
     )
     self.bbox1 = lsst.geom.Box2I(
         lsst.geom.Box2D(
             self.wcs.getPixelOrigin() - lsst.geom.Extent2D(15.0, 40.0),
             self.wcs.getPixelOrigin() + lsst.geom.Extent2D(3.0, 6.0)
         )
     )
     # these numbers are what were persisted as `Calib` objects in the files.
     self.photoCalib = lsst.afw.image.makePhotoCalibFromCalibZeroPoint(56.0, 2.2)
     self.visitInfo = self.createVisitInfo()
     self.detector = DetectorWrapper().detector
     record0 = self.cat.addNew()
     record0.setId(1)
     record0.set(self.ka, np.pi)
     record0.set(self.kb, 4)
     record0.setBBox(self.bbox0)
     record0.setPsf(self.psf)
     record0.setWcs(self.wcs)
     record0.setPhotoCalib(self.photoCalib)
     record0.setVisitInfo(self.visitInfo)
     record0.setValidPolygon(None)
     record0.setDetector(None)
     record1 = self.cat.addNew()
     record1.setId(2)
     record1.set(self.ka, 2.5)
     record1.set(self.kb, 2)
     record1.setWcs(self.wcs)
     record1.setBBox(self.bbox1)
     record1.setValidPolygon(self.makePolygon())
     record1.setDetector(self.detector)
Exemple #15
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    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = afwImage.readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width =  maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwImage.makeWcs(maskedImageMD)
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)         # n.b. the (100, 100, ...) form
        self.exposureCrOnly = afwImage.ExposureF(afwGeom.ExtentI(100, 100)) # test with ExtentI(100, 100) too

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        filterPolicy = pexPolicy.Policy()
        filterPolicy.add("lambdaEff", 470.0)
        afwImage.Filter.define(afwImage.FilterProperty("g", filterPolicy))
Exemple #16
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    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwGeom.makeSkyWcs(maskedImageMD, False)
        self.md = maskedImageMD
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        # n.b. the (100, 100, ...) form
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)
        # test with ExtentI(100, 100) too
        self.exposureCrOnly = afwImage.ExposureF(lsst.geom.ExtentI(100, 100))

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        defineFilter("g", 470.0)
Exemple #17
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class ExposureTestCase(lsst.utils.tests.TestCase):
    """
    A test case for the Exposure Class
    """

    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = afwImage.readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwImage.makeWcs(maskedImageMD)
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)         # n.b. the (100, 100, ...) form
        self.exposureCrOnly = afwImage.ExposureF(afwGeom.ExtentI(100, 100))  # test with ExtentI(100, 100) too

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        filterPolicy = pexPolicy.Policy()
        filterPolicy.add("lambdaEff", 470.0)
        afwImage.Filter.define(afwImage.FilterProperty("g", filterPolicy))

    def tearDown(self):
        del self.smallExposure
        del self.wcs
        del self.psf
        del self.detector

        del self.exposureBlank
        del self.exposureMiOnly
        del self.exposureMiWcs
        del self.exposureCrWcs
        del self.exposureCrOnly

    def testGetMaskedImage(self):
        """
        Test to ensure a MaskedImage can be obtained from each
        Exposure. An Exposure is required to have a MaskedImage,
        therefore each of the Exposures should return a MaskedImage.

        MaskedImage class should throw appropriate
        lsst::pex::exceptions::NotFound if the MaskedImage can not be
        obtained.
        """
        maskedImageBlank = self.exposureBlank.getMaskedImage()
        blankWidth = maskedImageBlank.getWidth()
        blankHeight = maskedImageBlank.getHeight()
        if blankWidth != blankHeight != 0:
            self.fail("%s = %s != 0" % (blankWidth, blankHeight))

        maskedImageMiOnly = self.exposureMiOnly.getMaskedImage()
        miOnlyWidth = maskedImageMiOnly.getWidth()
        miOnlyHeight = maskedImageMiOnly.getHeight()
        self.assertAlmostEqual(miOnlyWidth, self.width)
        self.assertAlmostEqual(miOnlyHeight, self.height)

        # NOTE: Unittests for Exposures created from a MaskedImage and
        # a WCS object are incomplete.  No way to test the validity of
        # the WCS being copied/created.

        maskedImageMiWcs = self.exposureMiWcs.getMaskedImage()
        miWcsWidth = maskedImageMiWcs.getWidth()
        miWcsHeight = maskedImageMiWcs.getHeight()
        self.assertAlmostEqual(miWcsWidth, self.width)
        self.assertAlmostEqual(miWcsHeight, self.height)

        maskedImageCrWcs = self.exposureCrWcs.getMaskedImage()
        crWcsWidth = maskedImageCrWcs.getWidth()
        crWcsHeight = maskedImageCrWcs.getHeight()
        if crWcsWidth != crWcsHeight != 0:
            self.fail("%s != %s != 0" % (crWcsWidth, crWcsHeight))

        maskedImageCrOnly = self.exposureCrOnly.getMaskedImage()
        crOnlyWidth = maskedImageCrOnly.getWidth()
        crOnlyHeight = maskedImageCrOnly.getHeight()
        if crOnlyWidth != crOnlyHeight != 0:
            self.fail("%s != %s != 0" % (crOnlyWidth, crOnlyHeight))

        # Check Exposure.getWidth() returns the MaskedImage's width
        self.assertEqual(crOnlyWidth, self.exposureCrOnly.getWidth())
        self.assertEqual(crOnlyHeight, self.exposureCrOnly.getHeight())

    def testGetWcs(self):
        """
        Test if a WCS can be obtained from each Exposure created with
        a WCS.

        Test that appropriate exceptions are thrown if a WCS is
        requested from an Exposure that was not created with a WCS.
        Python turns the pex::exceptions in the Exposure and
        MaskedImage classes into IndexErrors.

        The exposureBlank, exposureMiOnly, and exposureCrOnly
        Exposures should throw a lsst::pex::exceptions::NotFound.
        """

        self.assertFalse(self.exposureBlank.getWcs())
        self.assertFalse(self.exposureMiOnly.getWcs())

        # These two should pass
        self.exposureMiWcs.getWcs()
        self.exposureCrWcs.getWcs()

        self.assertFalse(self.exposureCrOnly.getWcs())

    def testExposureInfoConstructor(self):
        """Test the Exposure(maskedImage, exposureInfo) constructor"""
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setWcs(self.wcs)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage, exposureInfo)

        self.assertTrue(exposure.hasWcs())
        self.assertEqual(exposure.getWcs().getPixelOrigin(), self.wcs.getPixelOrigin())
        self.assertEquals(exposure.getDetector().getName(), self.detector.getName())
        self.assertEquals(exposure.getDetector().getSerial(), self.detector.getSerial())
        self.assertEquals(exposure.getFilter(), gFilter)

        self.assertTrue(exposure.getInfo().hasWcs())
        self.assertEqual(exposure.getInfo().getWcs().getPixelOrigin(), self.wcs.getPixelOrigin())
        self.assertEquals(exposure.getInfo().getDetector().getName(), self.detector.getName())
        self.assertEquals(exposure.getInfo().getDetector().getSerial(), self.detector.getSerial())
        self.assertEquals(exposure.getInfo().getFilter(), gFilter)

    def testNullWcs(self):
        """Test that an Exposure constructed with second argument None is usable

        When the exposureInfo constructor was first added, trying to get a WCS
        or other info caused a segfault because the ExposureInfo did not exist.
        """
        maskedImage = self.exposureMiOnly.getMaskedImage()
        exposure = afwImage.ExposureF(maskedImage, None)
        self.assertFalse(exposure.hasWcs())
        self.assertFalse(exposure.hasPsf())

    def testSetExposureInfo(self):
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setWcs(self.wcs)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage)
        self.assertFalse(exposure.hasWcs())

        exposure.setInfo(exposureInfo)

        self.assertTrue(exposure.hasWcs())
        self.assertEqual(exposure.getWcs().getPixelOrigin(), self.wcs.getPixelOrigin())
        self.assertEquals(exposure.getDetector().getName(), self.detector.getName())
        self.assertEquals(exposure.getDetector().getSerial(), self.detector.getSerial())
        self.assertEquals(exposure.getFilter(), gFilter)

    def testVisitInfoFitsPersistence(self):
        """Test saving an exposure to FITS and reading it back in preserves (some) VisitInfo fields"""
        exposureId = 5
        exposureTime = 12.3
        boresightRotAngle = 45.6 * afwGeom.degrees
        weather = afwCoord.Weather(1.1, 2.2, 0.3)
        visitInfo = afwImage.makeVisitInfo(
            exposureId = exposureId,
            exposureTime = exposureTime,
            boresightRotAngle = boresightRotAngle,
            weather = weather,
        )
        # Calib used to have exposure time and exposure date, so check for lack of interference
        calib = afwImage.Calib(3.4)
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setVisitInfo(visitInfo)
        exposureInfo.setCalib(calib)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage, exposureInfo)
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure.writeFits(tmpFile)
            rtExposure = afwImage.ExposureF(tmpFile)
        rtVisitInfo = rtExposure.getInfo().getVisitInfo()
        self.assertEqual(rtVisitInfo.getWeather(), weather)
        self.assertEqual(rtExposure.getCalib(), calib)
        self.assertEqual(rtExposure.getFilter(), gFilter)

    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(self.detector)
        exposure.setFilter(afwImage.Filter("g"))

        self.assertEquals(exposure.getDetector().getName(), self.detector.getName())
        self.assertEquals(exposure.getDetector().getSerial(), self.detector.getSerial())
        self.assertEquals(exposure.getFilter().getName(), "g")

        try:
            exposure.getWcs()
        except pexExcept.Exception as e:
            print("caught expected exception (getWcs): %s" % e)
            pass
        #
        # Test the Calib member.  The Calib tests are in color.py, here we just check that it's in Exposure
        #
        calib = exposure.getCalib()
        fluxMag0, FluxMag0Err = 1.1e12, 2.2e10
        calib.setFluxMag0(fluxMag0, FluxMag0Err)
        self.assertEqual(exposure.getCalib().getFluxMag0(), (fluxMag0, FluxMag0Err))
        #
        # now check that we can set Calib
        #
        calib = afwImage.Calib()
        fluxMag0_2, fluxMag0Err_2 = (511.1, 44.4)
        calib.setFluxMag0(fluxMag0_2, fluxMag0Err_2)

        exposure.setCalib(calib)

        self.assertEqual(exposure.getCalib().getFluxMag0(), (fluxMag0_2, fluxMag0Err_2))
        #
        # Psfs next
        #
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0))  # we can reset the Psf

        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)

    def testHasWcs(self):
        """
        Test if an Exposure has a WCS or not.
        """
        self.assertFalse(self.exposureBlank.hasWcs())

        self.assertFalse(self.exposureMiOnly.hasWcs())
        self.assertTrue(self.exposureMiWcs.hasWcs())
        self.assertTrue(self.exposureCrWcs.hasWcs())
        self.assertFalse(self.exposureCrOnly.hasWcs())

    def testGetSubExposure(self):
        """
        Test that a subExposure of the original Exposure can be obtained.

        The MaskedImage class should throw a
        lsst::pex::exceptions::InvalidParameter if the requested
        subRegion is not fully contained within the original
        MaskedImage.

        """
        #
        # This subExposure is valid
        #
        subBBox = afwGeom.Box2I(afwGeom.Point2I(40, 50), afwGeom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(self.exposureCrWcs, subBBox, afwImage.LOCAL)

        self.checkWcs(self.exposureCrWcs, subExposure)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class and should trigger an exception
        # from the WCS class for the MaskedImage 871034p_1_MI.

        subRegion3 = afwGeom.Box2I(afwGeom.Point2I(100, 100), afwGeom.Extent2I(10, 10))

        def getSubRegion():
            self.exposureCrWcs.Factory(self.exposureCrWcs, subRegion3, afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class only for the MaskedImage small_MI.
        # small_MI (cols, rows) = (256, 256)

        subRegion4 = afwGeom.Box2I(afwGeom.Point2I(250, 250), afwGeom.Extent2I(10, 10))

        def getSubRegion():
            self.exposureCrWcs.Factory(self.exposureCrWcs, subRegion4, afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # check the sub- and parent- exposures are using the same Wcs transformation
        subBBox = afwGeom.Box2I(afwGeom.Point2I(40, 50), afwGeom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(self.exposureCrWcs, subBBox, afwImage.LOCAL)
        parentPos = self.exposureCrWcs.getWcs().pixelToSky(0, 0)

        parentPos = parentPos.getPosition()

        subExpPos = subExposure.getWcs().pixelToSky(0, 0).getPosition()

        for i in range(2):
            self.assertAlmostEqual(parentPos[i], subExpPos[i], 9, "Wcs in sub image has changed")

    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(self.detector)

        subBBox = afwGeom.Box2I(afwGeom.Point2I(10, 10), afwGeom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(mainExposure, subBBox, afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)

        subExposure = afwImage.ExposureF(inFilePathSmall, subBBox, afwImage.LOCAL)

        self.checkWcs(mainExposure, subExposure)

        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)

        self.assertRaises(lsst.afw.fits.FitsError, getExposure)

        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        fluxMag0, fluxMag0Err = 1e12, 1e10
        mainExposure.getCalib().setFluxMag0(fluxMag0, fluxMag0Err)

        # Check scaling of Calib
        scale = 2.0
        calib = mainExposure.getCalib()
        calib *= scale
        self.assertEqual((fluxMag0*scale, fluxMag0Err*scale), calib.getFluxMag0())
        calib /= scale
        self.assertEqual((fluxMag0, fluxMag0Err), calib.getFluxMag0())

        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            mainExposure.writeFits(tmpFile)

            readExposure = type(mainExposure)(tmpFile)

            #
            # Check the round-tripping
            #
            self.assertEqual(mainExposure.getFilter().getName(), readExposure.getFilter().getName())

            self.assertEqual((fluxMag0, fluxMag0Err), readExposure.getCalib().getFluxMag0())

            psf = readExposure.getPsf()
            self.assertIsNotNone(psf)
            dummyPsf = DummyPsf.swigConvert(psf)
            self.assertIsNotNone(dummyPsf)
            self.assertEqual(dummyPsf.getValue(), self.psf.getValue())

    def checkWcs(self, parentExposure, subExposure):
        """Compare WCS at corner points of a sub-exposure and its parent exposure
           By using the function indexToPosition, we should be able to convert the indices
           (of the four corners (of the sub-exposure)) to positions and use the wcs
           to get the same sky coordinates for each.
        """
        subMI = subExposure.getMaskedImage()
        subDim = subMI.getDimensions()

        # Note: pixel positions must be computed relative to XY0 when working with WCS
        mainWcs = parentExposure.getWcs()
        subWcs = subExposure.getWcs()

        for xSubInd in (0, subDim.getX()-1):
            for ySubInd in (0, subDim.getY()-1):
                mainWcs.pixelToSky(
                    afwImage.indexToPosition(xSubInd),
                    afwImage.indexToPosition(ySubInd),
                )
                subWcs.pixelToSky(
                    afwImage.indexToPosition(xSubInd),
                    afwImage.indexToPosition(ySubInd),
                )

    def cmpExposure(self, e1, e2):
        self.assertEqual(e1.getDetector().getName(), e2.getDetector().getName())
        self.assertEqual(e1.getDetector().getSerial(), e2.getDetector().getSerial())
        self.assertEqual(e1.getFilter().getName(), e2.getFilter().getName())
        xy = afwGeom.Point2D(0, 0)
        self.assertEqual(e1.getWcs().pixelToSky(xy)[0], e2.getWcs().pixelToSky(xy)[0])
        self.assertEqual(e1.getCalib(), e2.getCalib())
        # check PSF identity
        if not e1.getPsf():
            self.assertFalse(e2.getPsf())
        else:
            psf1 = DummyPsf.swigConvert(e1.getPsf())
            psf2 = DummyPsf.swigConvert(e2.getPsf())
            self.assertEqual(psf1.getValue(), psf2.getValue())

    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(self.detector)
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.setPsf(DummyPsf(4.0))

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)

        # Ensure that the copy was deep.
        # (actually this test is invalid since getDetector() returns a CONST_PTR)
        # cen0 = exposureU.getDetector().getCenterPixel()
        # x0,y0 = cen0
        # det = exposureF.getDetector()
        # det.setCenterPixel(afwGeom.Point2D(999.0, 437.8))
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[0], x0)
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[1], y0)

    def testDeepCopyData(self):
        """Make sure a deep copy of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        expCopy = exp.clone()
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertFloatsAlmostEqual(miCopy.getImage().getArray(), -50)
        self.assertTrue(np.all(miCopy.getMask().getArray() == 2))
        self.assertFloatsAlmostEqual(miCopy.getVariance().getArray(), 175)

        self.assertFloatsAlmostEqual(mi.getImage().getArray(), 100)
        self.assertTrue(np.all(mi.getMask().getArray() == 5))
        self.assertFloatsAlmostEqual(mi.getVariance().getArray(), 200)

    def testDeepCopySubData(self):
        """Make sure a deep copy of a subregion of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        bbox = afwGeom.Box2I(afwGeom.Point2I(1, 0), afwGeom.Extent2I(5, 4))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertFloatsAlmostEqual(miCopy.getImage().getArray(), -50)
        self.assertTrue(np.all(miCopy.getMask().getArray() == 2))
        self.assertFloatsAlmostEqual(miCopy.getVariance().getArray(), 175)

        self.assertFloatsAlmostEqual(mi.getImage().getArray(), 100)
        self.assertTrue(np.all(mi.getMask().getArray() == 5))
        self.assertFloatsAlmostEqual(mi.getVariance().getArray(), 200)

    def testDeepCopyMetadata(self):
        """Make sure a deep copy of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        expCopy = exp.clone()
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.get("foo"), 6)
        self.assertEqual(expMeta.get("foo"), 5)  # this will fail if the bug is present

    def testDeepCopySubMetadata(self):
        """Make sure a deep copy of a subregion of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        bbox = afwGeom.Box2I(afwGeom.Point2I(1, 0), afwGeom.Extent2I(5, 5))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.get("foo"), 6)
        self.assertEqual(expMeta.get("foo"), 5)  # this will fail if the bug is present

    def testMakeExposureLeaks(self):
        """Test for memory leaks in makeExposure (the test is in lsst.utils.tests.MemoryTestCase)"""
        afwImage.makeMaskedImage(afwImage.ImageU(afwGeom.Extent2I(10, 20)))
        afwImage.makeExposure(afwImage.makeMaskedImage(afwImage.ImageU(afwGeom.Extent2I(10, 20))))

    def testImageSlices(self):
        """Test image slicing, which generate sub-images using Box2I under the covers"""
        exp = afwImage.ExposureF(10, 20)
        mi = exp.getMaskedImage()
        mi[9, 19] = 10
        # N.b. Exposures don't support setting/getting the pixels so can't replicate e.g. Image's slice tests
        sexp = exp[1:4, 6:10]
        self.assertEqual(sexp.getDimensions(), afwGeom.ExtentI(3, 4))
        sexp = exp[..., -3:]
        self.assertEqual(sexp.getDimensions(), afwGeom.ExtentI(exp.getWidth(), 3))
        self.assertEqual(sexp.getMaskedImage().get(sexp.getWidth() - 1, sexp.getHeight() - 1),
                         exp.getMaskedImage().get(exp.getWidth() - 1, exp.getHeight() - 1))

    def testConversionToScalar(self):
        """Test that even 1-pixel Exposures can't be converted to scalars"""
        im = afwImage.ExposureF(10, 20)

        self.assertRaises(TypeError, float, im)  # only single pixel images may be converted
        self.assertRaises(TypeError, float, im[0, 0])  # actually, can't convert (img, msk, var) to scalar

    def testReadMetadata(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            self.exposureCrWcs.getMetadata().set("FRAZZLE", True)
            # This will write the main metadata (inc. FRAZZLE) to the primary HDU, and the
            # WCS to subsequent HDUs, along with INHERIT=T.
            self.exposureCrWcs.writeFits(tmpFile)
            # This should read the first non-empty HDU (i.e. it skips the primary), but
            # goes back and reads it if it finds INHERIT=T.  That should let us read
            # frazzle and the Wcs from the PropertySet returned by readMetadata.
            md = afwImage.readMetadata(tmpFile)
            wcs = afwImage.makeWcs(md, True)
            self.assertEqual(wcs.getPixelOrigin(), self.wcs.getPixelOrigin())
            self.assertEqual(wcs.getSkyOrigin(), self.wcs.getSkyOrigin())
            self.assertTrue(np.all(wcs.getCDMatrix() == self.wcs.getCDMatrix()))
            frazzle = md.get("FRAZZLE")
            self.assertTrue(frazzle)

    def testArchiveKeys(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            exposure1.writeFits(tmpFile)
            exposure2 = afwImage.ExposureF(tmpFile)
            self.assertFalse(exposure2.getMetadata().exists("AR_ID"))
            self.assertFalse(exposure2.getMetadata().exists("PSF_ID"))
            self.assertFalse(exposure2.getMetadata().exists("WCS_ID"))

    def testTicket2861(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            schema = afwTable.ExposureTable.makeMinimalSchema()
            coaddInputs = afwImage.CoaddInputs(schema, schema)
            exposure1.getInfo().setCoaddInputs(coaddInputs)
            exposure2 = afwImage.ExposureF(exposure1, True)
            self.assertIsNotNone(exposure2.getInfo().getCoaddInputs())
            exposure2.writeFits(tmpFile)
            exposure3 = afwImage.ExposureF(tmpFile)
            self.assertIsNotNone(exposure3.getInfo().getCoaddInputs())
Exemple #18
0
class ExposureTestCase(unittest.TestCase):
    """
    A test case for the Exposure Class
    """

    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = afwImage.readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width =  maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwImage.makeWcs(maskedImageMD)
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)         # n.b. the (100, 100, ...) form
        self.exposureCrOnly = afwImage.ExposureF(afwGeom.ExtentI(100, 100)) # test with ExtentI(100, 100) too

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        filterPolicy = pexPolicy.Policy()
        filterPolicy.add("lambdaEff", 470.0)
        afwImage.Filter.define(afwImage.FilterProperty("g", filterPolicy))
            
    def tearDown(self):
        del self.smallExposure
        del self.wcs
        del self.psf
        del self.detector

        del self.exposureBlank
        del self.exposureMiOnly
        del self.exposureMiWcs
        del self.exposureCrWcs
        del self.exposureCrOnly

    def testGetMaskedImage(self):
        """
        Test to ensure a MaskedImage can be obtained from each
        Exposure. An Exposure is required to have a MaskedImage,
        therefore each of the Exposures should return a MaskedImage.

        MaskedImage class should throw appropriate
        lsst::pex::exceptions::NotFound if the MaskedImage can not be
        obtained.
        """
        maskedImageBlank = self.exposureBlank.getMaskedImage()
        blankWidth = maskedImageBlank.getWidth()
        blankHeight = maskedImageBlank.getHeight()
        if blankWidth != blankHeight != 0:
            self.fail("%s = %s != 0" % (blankWidth, blankHeight))
        
        maskedImageMiOnly = self.exposureMiOnly.getMaskedImage()
        miOnlyWidth = maskedImageMiOnly.getWidth()
        miOnlyHeight = maskedImageMiOnly.getHeight()
        self.assertAlmostEqual(miOnlyWidth, self.width)
        self.assertAlmostEqual(miOnlyHeight, self.height)
        
        # NOTE: Unittests for Exposures created from a MaskedImage and
        # a WCS object are incomplete.  No way to test the validity of
        # the WCS being copied/created.
        
        maskedImageMiWcs = self.exposureMiWcs.getMaskedImage()
        miWcsWidth = maskedImageMiWcs.getWidth()
        miWcsHeight = maskedImageMiWcs.getHeight()
        self.assertAlmostEqual(miWcsWidth, self.width)
        self.assertAlmostEqual(miWcsHeight, self.height)
       
        maskedImageCrWcs = self.exposureCrWcs.getMaskedImage()
        crWcsWidth = maskedImageCrWcs.getWidth()
        crWcsHeight = maskedImageCrWcs.getHeight()
        if crWcsWidth != crWcsHeight != 0:
            self.fail("%s != %s != 0" % (crWcsWidth, crWcsHeight))
        
        maskedImageCrOnly = self.exposureCrOnly.getMaskedImage()
        crOnlyWidth = maskedImageCrOnly.getWidth()
        crOnlyHeight = maskedImageCrOnly.getHeight()
        if crOnlyWidth != crOnlyHeight != 0:
            self.fail("%s != %s != 0" % (crOnlyWidth, crOnlyHeight))

        # Check Exposure.getWidth() returns the MaskedImage's width
        self.assertEqual(crOnlyWidth, self.exposureCrOnly.getWidth())
        self.assertEqual(crOnlyHeight, self.exposureCrOnly.getHeight())

    def testGetWcs(self):
        """
        Test if a WCS can be obtained from each Exposure created with
        a WCS.
    
        Test that appropriate exceptions are thrown if a WCS is
        requested from an Exposure that was not created with a WCS.
        Python turns the pex::exceptions in the Exposure and
        MaskedImage classes into IndexErrors.

        The exposureBlank, exposureMiOnly, and exposureCrOnly
        Exposures should throw a lsst::pex::exceptions::NotFound.
        """

        self.assertTrue(not self.exposureBlank.getWcs())
        self.assertTrue(not self.exposureMiOnly.getWcs())

        # These two should pass
        self.exposureMiWcs.getWcs()
        self.exposureCrWcs.getWcs()
       
        self.assertTrue(not self.exposureCrOnly.getWcs())
            
    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(self.detector)
        exposure.setFilter(afwImage.Filter("g"))

        self.assertEquals(exposure.getDetector().getName(), self.detector.getName())
        self.assertEquals(exposure.getDetector().getSerial(), self.detector.getSerial())
        self.assertEquals(exposure.getFilter().getName(), "g")
        
        try:
            exposure.getWcs()
        except pexExcept.Exception as e:
            print "caught expected exception (getWcs): %s" % e
            pass
        #
        # Test the Calib member.  The Calib tests are in color.py, here we just check that it's in Exposure
        #
        calib = exposure.getCalib()
        dt = 10
        calib.setExptime(dt)
        self.assertEqual(exposure.getCalib().getExptime(), dt)
        #
        # now check that we can set Calib
        #
        calib = afwImage.Calib()
        dt = 666
        calib.setExptime(dt)

        exposure.setCalib(calib)

        self.assertEqual(exposure.getCalib().getExptime(), dt)
        #
        # Psfs next
        #
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0)) # we can reset the Psf
         
        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
       
    def testHasWcs(self):
        """
        Test if an Exposure has a WCS or not.
        """
        self.assertFalse(self.exposureBlank.hasWcs())

        self.assertFalse(self.exposureMiOnly.hasWcs())
        self.assertTrue(self.exposureMiWcs.hasWcs())
        self.assertTrue(self.exposureCrWcs.hasWcs())
        self.assertFalse(self.exposureCrOnly.hasWcs())
       
    def testGetSubExposure(self):
        """
        Test that a subExposure of the original Exposure can be obtained.

        The MaskedImage class should throw a
        lsst::pex::exceptions::InvalidParameter if the requested
        subRegion is not fully contained within the original
        MaskedImage.
        
        """
        #
        # This subExposure is valid
        #
        subBBox = afwGeom.Box2I(afwGeom.Point2I(40, 50), afwGeom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(self.exposureCrWcs, subBBox, afwImage.LOCAL)
        
        self.checkWcs(self.exposureCrWcs, subExposure)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class and should trigger an exception
        # from the WCS class for the MaskedImage 871034p_1_MI.
        
        subRegion3 = afwGeom.Box2I(afwGeom.Point2I(100, 100), afwGeom.Extent2I(10, 10))
        def getSubRegion():
            self.exposureCrWcs.Factory(self.exposureCrWcs, subRegion3, afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class only for the MaskedImage small_MI.
        # small_MI (cols, rows) = (256, 256)

        subRegion4 = afwGeom.Box2I(afwGeom.Point2I(250, 250), afwGeom.Extent2I(10, 10))
        def getSubRegion():
            self.exposureCrWcs.Factory(self.exposureCrWcs, subRegion4, afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        #check the sub- and parent- exposures are using the same Wcs transformation
        subBBox = afwGeom.Box2I(afwGeom.Point2I(40, 50), afwGeom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(self.exposureCrWcs, subBBox, afwImage.LOCAL)
        parentPos = self.exposureCrWcs.getWcs().pixelToSky(0,0)
        
        parentPos = parentPos.getPosition()
        
        subExpPos = subExposure.getWcs().pixelToSky(0,0).getPosition()
        
        for i in range(2):
            self.assertAlmostEqual(parentPos[i], subExpPos[i], 9, "Wcs in sub image has changed")

    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(self.detector)
        
        subBBox = afwGeom.Box2I(afwGeom.Point2I(10, 10), afwGeom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(mainExposure, subBBox, afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)
        
        subExposure = afwImage.ExposureF(inFilePathSmall, subBBox, afwImage.LOCAL)
        
        self.checkWcs(mainExposure, subExposure)
        
        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)
        
        self.assertRaises(lsst.afw.fits.FitsError, getExposure)
        
        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        mainExposure.getCalib().setExptime(10)
        mainExposure.getCalib().setMidTime(dafBase.DateTime())
        midMjd = mainExposure.getCalib().getMidTime().get()
        fluxMag0, fluxMag0Err = 1e12, 1e10
        mainExposure.getCalib().setFluxMag0(fluxMag0, fluxMag0Err)

        with utilsTests.getTempFilePath(".fits") as tmpFile:
            mainExposure.writeFits(tmpFile)

            readExposure = type(mainExposure)(tmpFile)

            #
            # Check the round-tripping
            #
            self.assertEqual(mainExposure.getFilter().getName(), readExposure.getFilter().getName())

            self.assertEqual(mainExposure.getCalib().getExptime(), readExposure.getCalib().getExptime())
            self.assertEqual(midMjd, readExposure.getCalib().getMidTime().get())
            self.assertEqual((fluxMag0, fluxMag0Err), readExposure.getCalib().getFluxMag0())

            psf = readExposure.getPsf()
            self.assert_(psf is not None)
            dummyPsf = DummyPsf.swigConvert(psf)
            self.assert_(dummyPsf is not None)
            self.assertEqual(dummyPsf.getValue(), self.psf.getValue())

    def checkWcs(self, parentExposure, subExposure):
        """Compare WCS at corner points of a sub-exposure and its parent exposure
           By using the function indexToPosition, we should be able to convert the indices
           (of the four corners (of the sub-exposure)) to positions and use the wcs
           to get the same sky coordinates for each.
        """
        subMI = subExposure.getMaskedImage()
        subDim = subMI.getDimensions()

        # Note: pixel positions must be computed relative to XY0 when working with WCS
        mainWcs = parentExposure.getWcs()
        subWcs = subExposure.getWcs()

        for xSubInd in (0, subDim.getX()-1):
            for ySubInd in (0, subDim.getY()-1):
                mainWcs.pixelToSky(
                    afwImage.indexToPosition(xSubInd),
                    afwImage.indexToPosition(ySubInd),
                )
                subWcs.pixelToSky(
                    afwImage.indexToPosition(xSubInd),
                    afwImage.indexToPosition(ySubInd),
                )

    def cmpExposure(self, e1, e2):
        self.assertEqual(e1.getDetector().getName(), e2.getDetector().getName())
        self.assertEqual(e1.getDetector().getSerial(), e2.getDetector().getSerial())
        self.assertEqual(e1.getFilter().getName(), e2.getFilter().getName())
        xy = afwGeom.Point2D(0, 0)
        self.assertEqual(e1.getWcs().pixelToSky(xy)[0], e2.getWcs().pixelToSky(xy)[0])
        self.assertEqual(e1.getCalib().getExptime(), e2.getCalib().getExptime())
        # check PSF identity
        if not e1.getPsf():
            self.assertFalse(e2.getPsf())
        else:
            psf1 = DummyPsf.swigConvert(e1.getPsf())
            psf2 = DummyPsf.swigConvert(e2.getPsf())
            self.assertEqual(psf1.getValue(), psf2.getValue())

    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(self.detector)
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.getCalib().setExptime(666)
        exposureU.setPsf(DummyPsf(4.0))

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)

        # Ensure that the copy was deep.
        # (actually this test is invalid since getDetector() returns a CONST_PTR)
        # cen0 = exposureU.getDetector().getCenterPixel()
        # x0,y0 = cen0
        # det = exposureF.getDetector()
        # det.setCenterPixel(afwGeom.Point2D(999.0, 437.8))
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[0], x0)
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[1], y0)
    
    def testDeepCopyData(self):
        """Make sure a deep copy of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        expCopy = exp.clone()
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertTrue(numpy.allclose(miCopy.getImage().getArray(), -50))
        self.assertTrue(numpy.all(miCopy.getMask().getArray() == 2))
        self.assertTrue(numpy.allclose(miCopy.getVariance().getArray(), 175))

        self.assertTrue(numpy.allclose(mi.getImage().getArray(), 100))
        self.assertTrue(numpy.all(mi.getMask().getArray() == 5))
        self.assertTrue(numpy.allclose(mi.getVariance().getArray(), 200))

    
    def testDeepCopySubData(self):
        """Make sure a deep copy of a subregion of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        bbox = afwGeom.Box2I(afwGeom.Point2I(1,0), afwGeom.Extent2I(5, 4))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertTrue(numpy.allclose(miCopy.getImage().getArray(), -50))
        self.assertTrue(numpy.all(miCopy.getMask().getArray() == 2))
        self.assertTrue(numpy.allclose(miCopy.getVariance().getArray(), 175))

        self.assertTrue(numpy.allclose(mi.getImage().getArray(), 100))
        self.assertTrue(numpy.all(mi.getMask().getArray() == 5))
        self.assertTrue(numpy.allclose(mi.getVariance().getArray(), 200))
    
    def testDeepCopyMetadata(self):
        """Make sure a deep copy of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        expCopy = exp.clone()
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.get("foo"), 6)
        self.assertEqual(expMeta.get("foo"), 5) # this will fail if the bug is present

    def testDeepCopySubMetadata(self):
        """Make sure a deep copy of a subregion of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        bbox = afwGeom.Box2I(afwGeom.Point2I(1,0), afwGeom.Extent2I(5, 5))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.get("foo"), 6)
        self.assertEqual(expMeta.get("foo"), 5) # this will fail if the bug is present

    def testMakeExposureLeaks(self):
        """Test for memory leaks in makeExposure (the test is in utilsTests.MemoryTestCase)"""
        afwImage.makeMaskedImage(afwImage.ImageU(afwGeom.Extent2I(10, 20)))
        afwImage.makeExposure(afwImage.makeMaskedImage(afwImage.ImageU(afwGeom.Extent2I(10, 20))))

    def testImageSlices(self):
        """Test image slicing, which generate sub-images using Box2I under the covers"""
        exp = afwImage.ExposureF(10, 20)
        mi = exp.getMaskedImage()
        mi[9, 19] = 10
        # N.b. Exposures don't support setting/getting the pixels so can't replicate e.g. Image's slice tests
        sexp = exp[1:4, 6:10]
        self.assertEqual(sexp.getDimensions(), afwGeom.ExtentI(3, 4))
        sexp = exp[..., -3:]
        self.assertEqual(sexp.getDimensions(), afwGeom.ExtentI(exp.getWidth(), 3))
        self.assertEqual(sexp.getMaskedImage().get(sexp.getWidth() - 1, sexp.getHeight() - 1),
                          exp.getMaskedImage().get( exp.getWidth() - 1,  exp.getHeight() - 1))

    def testConversionToScalar(self):
        """Test that even 1-pixel Exposures can't be converted to scalars"""
        im = afwImage.ExposureF(10, 20)

        self.assertRaises(TypeError, float, im) # only single pixel images may be converted
        self.assertRaises(TypeError, float, im[0,0]) # actually, can't convert (img, msk, var) to scalar

    def testReadMetadata(self):
        with utilsTests.getTempFilePath(".fits") as tmpFile:
            self.exposureCrWcs.getMetadata().set("FRAZZLE", True)
            # This will write the main metadata (inc. FRAZZLE) to the primary HDU, and the
            # WCS to subsequent HDUs, along with INHERIT=T.
            self.exposureCrWcs.writeFits(tmpFile)
            # This should read the first non-empty HDU (i.e. it skips the primary), but
            # goes back and reads it if it finds INHERIT=T.  That should let us read
            # frazzle and the Wcs from the PropertySet returned by readMetadata.
            md = afwImage.readMetadata(tmpFile)
            wcs = afwImage.makeWcs(md, True)
            self.assertEqual(wcs.getPixelOrigin(), self.wcs.getPixelOrigin())
            self.assertEqual(wcs.getSkyOrigin(), self.wcs.getSkyOrigin())
            self.assert_(numpy.all(wcs.getCDMatrix() == self.wcs.getCDMatrix()))
            frazzle = md.get("FRAZZLE")
            self.assert_(frazzle is True)

    def testArchiveKeys(self):
        with utilsTests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            exposure1.writeFits(tmpFile)
            exposure2 = afwImage.ExposureF(tmpFile)
            self.assertFalse(exposure2.getMetadata().exists("AR_ID"))
            self.assertFalse(exposure2.getMetadata().exists("PSF_ID"))
            self.assertFalse(exposure2.getMetadata().exists("WCS_ID"))

    def testTicket2861(self):
        with utilsTests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            schema = afwTable.ExposureTable.makeMinimalSchema()
            coaddInputs = afwImage.CoaddInputs(schema, schema)
            exposure1.getInfo().setCoaddInputs(coaddInputs)
            exposure2 = afwImage.ExposureF(exposure1, True)
            self.assertIsNotNone(exposure2.getInfo().getCoaddInputs())
            exposure2.writeFits(tmpFile)
            exposure3 = afwImage.ExposureF(tmpFile)
            self.assertIsNotNone(exposure3.getInfo().getCoaddInputs())
Exemple #19
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class ExposureTestCase(unittest.TestCase):
    """
    A test case for the Exposure Class
    """
    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = afwImage.readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwImage.makeWcs(maskedImageMD)
        self.psf = DummyPsf(2.0)

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        self.exposureCrWcs = afwImage.ExposureF(
            100, 100, self.wcs)  # n.b. the (100, 100, ...) form
        self.exposureCrOnly = afwImage.ExposureF(afwGeom.ExtentI(
            100, 100))  # test with ExtentI(100, 100) too

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        filterPolicy = pexPolicy.Policy()
        filterPolicy.add("lambdaEff", 470.0)
        afwImage.Filter.define(afwImage.FilterProperty("g", filterPolicy))

    def tearDown(self):
        del self.smallExposure
        del self.wcs
        del self.psf

        del self.exposureBlank
        del self.exposureMiOnly
        del self.exposureMiWcs
        del self.exposureCrWcs
        del self.exposureCrOnly

    def testGetMaskedImage(self):
        """
        Test to ensure a MaskedImage can be obtained from each
        Exposure. An Exposure is required to have a MaskedImage,
        therefore each of the Exposures should return a MaskedImage.

        MaskedImage class should throw appropriate
        lsst::pex::exceptions::NotFound if the MaskedImage can not be
        obtained.
        """
        maskedImageBlank = self.exposureBlank.getMaskedImage()
        blankWidth = maskedImageBlank.getWidth()
        blankHeight = maskedImageBlank.getHeight()
        if blankWidth != blankHeight != 0:
            self.fail("%s = %s != 0" % (blankWidth, blankHeight))

        maskedImageMiOnly = self.exposureMiOnly.getMaskedImage()
        miOnlyWidth = maskedImageMiOnly.getWidth()
        miOnlyHeight = maskedImageMiOnly.getHeight()
        self.assertAlmostEqual(miOnlyWidth, self.width)
        self.assertAlmostEqual(miOnlyHeight, self.height)

        # NOTE: Unittests for Exposures created from a MaskedImage and
        # a WCS object are incomplete.  No way to test the validity of
        # the WCS being copied/created.

        maskedImageMiWcs = self.exposureMiWcs.getMaskedImage()
        miWcsWidth = maskedImageMiWcs.getWidth()
        miWcsHeight = maskedImageMiWcs.getHeight()
        self.assertAlmostEqual(miWcsWidth, self.width)
        self.assertAlmostEqual(miWcsHeight, self.height)

        maskedImageCrWcs = self.exposureCrWcs.getMaskedImage()
        crWcsWidth = maskedImageCrWcs.getWidth()
        crWcsHeight = maskedImageCrWcs.getHeight()
        if crWcsWidth != crWcsHeight != 0:
            self.fail("%s != %s != 0" % (crWcsWidth, crWcsHeight))

        maskedImageCrOnly = self.exposureCrOnly.getMaskedImage()
        crOnlyWidth = maskedImageCrOnly.getWidth()
        crOnlyHeight = maskedImageCrOnly.getHeight()
        if crOnlyWidth != crOnlyHeight != 0:
            self.fail("%s != %s != 0" % (crOnlyWidth, crOnlyHeight))

        # Check Exposure.getWidth() returns the MaskedImage's width
        self.assertEqual(crOnlyWidth, self.exposureCrOnly.getWidth())
        self.assertEqual(crOnlyHeight, self.exposureCrOnly.getHeight())

    def testGetWcs(self):
        """
        Test if a WCS can be obtained from each Exposure created with
        a WCS.
    
        Test that appropriate exceptions are thrown if a WCS is
        requested from an Exposure that was not created with a WCS.
        Python turns the pex::exceptions in the Exposure and
        MaskedImage classes into IndexErrors.

        The exposureBlank, exposureMiOnly, and exposureCrOnly
        Exposures should throw a lsst::pex::exceptions::NotFound.
        """

        self.assertTrue(not self.exposureBlank.getWcs())
        self.assertTrue(not self.exposureMiOnly.getWcs())

        # These two should pass
        self.exposureMiWcs.getWcs()
        self.exposureCrWcs.getWcs()

        self.assertTrue(not self.exposureCrOnly.getWcs())

    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(cameraGeom.Detector(cameraGeom.Id(666)))
        exposure.setFilter(afwImage.Filter("g"))

        self.assertEquals(exposure.getDetector().getId().getSerial(), 666)
        self.assertEquals(exposure.getFilter().getName(), "g")

        try:
            exposure.getWcs()
        except pexExcept.LsstCppException, e:
            print "caught expected exception (getWcs): %s" % e
            pass
        #
        # Test the Calib member.  The Calib tests are in color.py, here we just check that it's in Exposure
        #
        calib = exposure.getCalib()
        dt = 10
        calib.setExptime(dt)
        self.assertEqual(exposure.getCalib().getExptime(), dt)
        #
        # now check that we can set Calib
        #
        calib = afwImage.Calib()
        dt = 666
        calib.setExptime(dt)

        exposure.setCalib(calib)

        self.assertEqual(exposure.getCalib().getExptime(), dt)
        #
        # Psfs next
        #
        w, h = 11, 11
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0))  # we can reset the Psf

        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
Exemple #20
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    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(cameraGeom.Detector(cameraGeom.Id(666)))

        subBBox = afwGeom.Box2I(afwGeom.Point2I(10, 10),
                                afwGeom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(mainExposure, subBBox,
                                           afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)

        subExposure = afwImage.ExposureF(inFilePathSmall, subBBox)

        self.checkWcs(mainExposure, subExposure)

        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)

        utilsTests.assertRaisesLsstCpp(self, lsst.afw.fits.FitsError,
                                       getExposure)

        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        mainExposure.getCalib().setExptime(10)
        mainExposure.getCalib().setMidTime(dafBase.DateTime())
        midMjd = mainExposure.getCalib().getMidTime().get()
        fluxMag0, fluxMag0Err = 1e12, 1e10
        mainExposure.getCalib().setFluxMag0(fluxMag0, fluxMag0Err)

        mainExposure.writeFits(outFile)

        # Check scaling of Calib
        scale = 2.0
        calib = mainExposure.getCalib()
        calib *= scale
        self.assertEqual((fluxMag0 * scale, fluxMag0Err * scale),
                         calib.getFluxMag0())
        calib /= scale
        self.assertEqual((fluxMag0, fluxMag0Err), calib.getFluxMag0())

        readExposure = type(mainExposure)(outFile)

        os.remove(outFile)
        #
        # Check the round-tripping
        #
        self.assertEqual(mainExposure.getFilter().getName(),
                         readExposure.getFilter().getName())

        self.assertEqual(mainExposure.getCalib().getExptime(),
                         readExposure.getCalib().getExptime())
        self.assertEqual(midMjd, readExposure.getCalib().getMidTime().get())
        self.assertEqual((fluxMag0, fluxMag0Err),
                         readExposure.getCalib().getFluxMag0())

        psf = readExposure.getPsf()
        self.assert_(psf is not None)
        dummyPsf = DummyPsf.swigConvert(psf)
        self.assert_(dummyPsf is not None)
        self.assertEqual(dummyPsf.getValue(), self.psf.getValue())
Exemple #21
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class ExposureTestCase(lsst.utils.tests.TestCase):
    """
    A test case for the Exposure Class
    """

    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwGeom.makeSkyWcs(maskedImageMD, False)
        self.md = maskedImageMD
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        # n.b. the (100, 100, ...) form
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)
        # test with ExtentI(100, 100) too
        self.exposureCrOnly = afwImage.ExposureF(lsst.geom.ExtentI(100, 100))

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        defineFilter("g", 470.0)

    def tearDown(self):
        del self.smallExposure
        del self.wcs
        del self.psf
        del self.detector

        del self.exposureBlank
        del self.exposureMiOnly
        del self.exposureMiWcs
        del self.exposureCrWcs
        del self.exposureCrOnly

    def testGetMaskedImage(self):
        """
        Test to ensure a MaskedImage can be obtained from each
        Exposure. An Exposure is required to have a MaskedImage,
        therefore each of the Exposures should return a MaskedImage.

        MaskedImage class should throw appropriate
        lsst::pex::exceptions::NotFound if the MaskedImage can not be
        obtained.
        """
        maskedImageBlank = self.exposureBlank.getMaskedImage()
        blankWidth = maskedImageBlank.getWidth()
        blankHeight = maskedImageBlank.getHeight()
        if blankWidth != blankHeight != 0:
            self.fail("%s = %s != 0" % (blankWidth, blankHeight))

        maskedImageMiOnly = self.exposureMiOnly.getMaskedImage()
        miOnlyWidth = maskedImageMiOnly.getWidth()
        miOnlyHeight = maskedImageMiOnly.getHeight()
        self.assertAlmostEqual(miOnlyWidth, self.width)
        self.assertAlmostEqual(miOnlyHeight, self.height)

        # NOTE: Unittests for Exposures created from a MaskedImage and
        # a WCS object are incomplete.  No way to test the validity of
        # the WCS being copied/created.

        maskedImageMiWcs = self.exposureMiWcs.getMaskedImage()
        miWcsWidth = maskedImageMiWcs.getWidth()
        miWcsHeight = maskedImageMiWcs.getHeight()
        self.assertAlmostEqual(miWcsWidth, self.width)
        self.assertAlmostEqual(miWcsHeight, self.height)

        maskedImageCrWcs = self.exposureCrWcs.getMaskedImage()
        crWcsWidth = maskedImageCrWcs.getWidth()
        crWcsHeight = maskedImageCrWcs.getHeight()
        if crWcsWidth != crWcsHeight != 0:
            self.fail("%s != %s != 0" % (crWcsWidth, crWcsHeight))

        maskedImageCrOnly = self.exposureCrOnly.getMaskedImage()
        crOnlyWidth = maskedImageCrOnly.getWidth()
        crOnlyHeight = maskedImageCrOnly.getHeight()
        if crOnlyWidth != crOnlyHeight != 0:
            self.fail("%s != %s != 0" % (crOnlyWidth, crOnlyHeight))

        # Check Exposure.getWidth() returns the MaskedImage's width
        self.assertEqual(crOnlyWidth, self.exposureCrOnly.getWidth())
        self.assertEqual(crOnlyHeight, self.exposureCrOnly.getHeight())

    def testProperties(self):
        self.assertMaskedImagesEqual(self.exposureMiOnly.maskedImage,
                                     self.exposureMiOnly.getMaskedImage())
        mi2 = afwImage.MaskedImageF(self.exposureMiOnly.getDimensions())
        mi2.image.array[:] = 5.0
        mi2.variance.array[:] = 3.0
        mi2.mask.array[:] = 0x1
        self.exposureMiOnly.maskedImage = mi2
        self.assertMaskedImagesEqual(self.exposureMiOnly.maskedImage, mi2)
        self.assertImagesEqual(self.exposureMiOnly.image,
                               self.exposureMiOnly.maskedImage.image)

        image3 = afwImage.ImageF(self.exposureMiOnly.getDimensions())
        image3.array[:] = 3.0
        self.exposureMiOnly.image = image3
        self.assertImagesEqual(self.exposureMiOnly.image, image3)

        mask3 = afwImage.MaskX(self.exposureMiOnly.getDimensions())
        mask3.array[:] = 0x2
        self.exposureMiOnly.mask = mask3
        self.assertMasksEqual(self.exposureMiOnly.mask, mask3)

        var3 = afwImage.ImageF(self.exposureMiOnly.getDimensions())
        var3.array[:] = 2.0
        self.exposureMiOnly.variance = var3
        self.assertImagesEqual(self.exposureMiOnly.variance, var3)

    def testGetWcs(self):
        """
        Test if a WCS can be obtained from each Exposure created with
        a WCS.

        Test that appropriate exceptions are thrown if a WCS is
        requested from an Exposure that was not created with a WCS.
        Python turns the pex::exceptions in the Exposure and
        MaskedImage classes into IndexErrors.

        The exposureBlank, exposureMiOnly, and exposureCrOnly
        Exposures should throw a lsst::pex::exceptions::NotFound.
        """

        self.assertFalse(self.exposureBlank.getWcs())
        self.assertFalse(self.exposureMiOnly.getWcs())

        # These two should pass
        self.exposureMiWcs.getWcs()
        self.exposureCrWcs.getWcs()

        self.assertFalse(self.exposureCrOnly.getWcs())

    def testExposureInfoConstructor(self):
        """Test the Exposure(maskedImage, exposureInfo) constructor"""
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setWcs(self.wcs)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage, exposureInfo)

        self.assertTrue(exposure.hasWcs())
        self.assertEqual(exposure.getWcs().getPixelOrigin(),
                         self.wcs.getPixelOrigin())
        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter(), gFilter)

        self.assertTrue(exposure.getInfo().hasWcs())
        self.assertEqual(exposure.getInfo().getWcs().getPixelOrigin(),
                         self.wcs.getPixelOrigin())
        self.assertEqual(exposure.getInfo().getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getInfo().getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getInfo().getFilter(), gFilter)

    def testNullWcs(self):
        """Test that an Exposure constructed with second argument None is usable

        When the exposureInfo constructor was first added, trying to get a WCS
        or other info caused a segfault because the ExposureInfo did not exist.
        """
        maskedImage = self.exposureMiOnly.getMaskedImage()
        exposure = afwImage.ExposureF(maskedImage, None)
        self.assertFalse(exposure.hasWcs())
        self.assertFalse(exposure.hasPsf())

    def testExposureInfoSetNone(self):
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setDetector(None)
        exposureInfo.setValidPolygon(None)
        exposureInfo.setPsf(None)
        exposureInfo.setWcs(None)
        exposureInfo.setPhotoCalib(None)
        exposureInfo.setCoaddInputs(None)
        exposureInfo.setVisitInfo(None)
        exposureInfo.setApCorrMap(None)

    def testSetExposureInfo(self):
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setWcs(self.wcs)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage)
        self.assertFalse(exposure.hasWcs())

        exposure.setInfo(exposureInfo)

        self.assertTrue(exposure.hasWcs())
        self.assertEqual(exposure.getWcs().getPixelOrigin(),
                         self.wcs.getPixelOrigin())
        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter(), gFilter)

    def testVisitInfoFitsPersistence(self):
        """Test saving an exposure to FITS and reading it back in preserves (some) VisitInfo fields"""
        exposureId = 5
        exposureTime = 12.3
        boresightRotAngle = 45.6 * lsst.geom.degrees
        weather = Weather(1.1, 2.2, 0.3)
        visitInfo = afwImage.VisitInfo(
            exposureId=exposureId,
            exposureTime=exposureTime,
            boresightRotAngle=boresightRotAngle,
            weather=weather,
        )
        photoCalib = afwImage.PhotoCalib(3.4, 5.6)
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setVisitInfo(visitInfo)
        exposureInfo.setPhotoCalib(photoCalib)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage, exposureInfo)
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure.writeFits(tmpFile)
            rtExposure = afwImage.ExposureF(tmpFile)
        rtVisitInfo = rtExposure.getInfo().getVisitInfo()
        self.assertEqual(rtVisitInfo.getWeather(), weather)
        self.assertEqual(rtExposure.getPhotoCalib(), photoCalib)
        self.assertEqual(rtExposure.getFilter(), gFilter)

    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(self.detector)
        exposure.setFilter(afwImage.Filter("g"))

        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter().getName(), "g")
        self.assertEqual(exposure.getWcs(), self.wcs)

        # The PhotoCalib tests are in test_photoCalib.py;
        # here we just check that it's gettable and settable.
        self.assertIsNone(exposure.getPhotoCalib())

        photoCalib = afwImage.PhotoCalib(511.1, 44.4)
        exposure.setPhotoCalib(photoCalib)
        self.assertEqual(exposure.getPhotoCalib(), photoCalib)

        # Psfs next
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0))  # we can reset the Psf

        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)

    def testHasWcs(self):
        """
        Test if an Exposure has a WCS or not.
        """
        self.assertFalse(self.exposureBlank.hasWcs())

        self.assertFalse(self.exposureMiOnly.hasWcs())
        self.assertTrue(self.exposureMiWcs.hasWcs())
        self.assertTrue(self.exposureCrWcs.hasWcs())
        self.assertFalse(self.exposureCrOnly.hasWcs())

    def testGetSubExposure(self):
        """
        Test that a subExposure of the original Exposure can be obtained.

        The MaskedImage class should throw a
        lsst::pex::exceptions::InvalidParameter if the requested
        subRegion is not fully contained within the original
        MaskedImage.

        """
        #
        # This subExposure is valid
        #
        subBBox = lsst.geom.Box2I(lsst.geom.Point2I(40, 50),
                                  lsst.geom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(
            self.exposureCrWcs, subBBox, afwImage.LOCAL)

        self.checkWcs(self.exposureCrWcs, subExposure)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class and should trigger an exception
        # from the WCS class for the MaskedImage 871034p_1_MI.

        subRegion3 = lsst.geom.Box2I(lsst.geom.Point2I(100, 100),
                                     lsst.geom.Extent2I(10, 10))

        def getSubRegion():
            self.exposureCrWcs.Factory(
                self.exposureCrWcs, subRegion3, afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class only for the MaskedImage small_MI.
        # small_MI (cols, rows) = (256, 256)

        subRegion4 = lsst.geom.Box2I(lsst.geom.Point2I(250, 250),
                                     lsst.geom.Extent2I(10, 10))

        def getSubRegion():
            self.exposureCrWcs.Factory(
                self.exposureCrWcs, subRegion4, afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # check the sub- and parent- exposures are using the same Wcs
        # transformation
        subBBox = lsst.geom.Box2I(lsst.geom.Point2I(40, 50),
                                  lsst.geom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(
            self.exposureCrWcs, subBBox, afwImage.LOCAL)
        parentSkyPos = self.exposureCrWcs.getWcs().pixelToSky(0, 0)

        subExpSkyPos = subExposure.getWcs().pixelToSky(0, 0)

        self.assertSpherePointsAlmostEqual(parentSkyPos, subExpSkyPos, msg="Wcs in sub image has changed")

    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(self.detector)

        subBBox = lsst.geom.Box2I(lsst.geom.Point2I(10, 10),
                                  lsst.geom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(
            mainExposure, subBBox, afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)

        subExposure = afwImage.ExposureF(
            inFilePathSmall, subBBox, afwImage.LOCAL)

        self.checkWcs(mainExposure, subExposure)

        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)

        self.assertRaises(FitsError, getExposure)

        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        photoCalib = afwImage.PhotoCalib(1e-10, 1e-12)
        mainExposure.setPhotoCalib(photoCalib)

        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            mainExposure.writeFits(tmpFile)

            readExposure = type(mainExposure)(tmpFile)

            #
            # Check the round-tripping
            #
            self.assertEqual(mainExposure.getFilter().getName(),
                             readExposure.getFilter().getName())

            self.assertEqual(photoCalib, readExposure.getPhotoCalib())

            psf = readExposure.getPsf()
            self.assertIsNotNone(psf)
            self.assertEqual(psf.getValue(), self.psf.getValue())

    def checkWcs(self, parentExposure, subExposure):
        """Compare WCS at corner points of a sub-exposure and its parent exposure
           By using the function indexToPosition, we should be able to convert the indices
           (of the four corners (of the sub-exposure)) to positions and use the wcs
           to get the same sky coordinates for each.
        """
        subMI = subExposure.getMaskedImage()
        subDim = subMI.getDimensions()

        # Note: pixel positions must be computed relative to XY0 when working
        # with WCS
        mainWcs = parentExposure.getWcs()
        subWcs = subExposure.getWcs()

        for xSubInd in (0, subDim.getX()-1):
            for ySubInd in (0, subDim.getY()-1):
                self.assertSpherePointsAlmostEqual(
                    mainWcs.pixelToSky(
                        afwImage.indexToPosition(xSubInd),
                        afwImage.indexToPosition(ySubInd),
                    ),
                    subWcs.pixelToSky(
                        afwImage.indexToPosition(xSubInd),
                        afwImage.indexToPosition(ySubInd),
                    ))

    def cmpExposure(self, e1, e2):
        self.assertEqual(e1.getDetector().getName(),
                         e2.getDetector().getName())
        self.assertEqual(e1.getDetector().getSerial(),
                         e2.getDetector().getSerial())
        self.assertEqual(e1.getFilter().getName(), e2.getFilter().getName())
        xy = lsst.geom.Point2D(0, 0)
        self.assertEqual(e1.getWcs().pixelToSky(xy)[0],
                         e2.getWcs().pixelToSky(xy)[0])
        self.assertEqual(e1.getPhotoCalib(), e2.getPhotoCalib())
        # check PSF identity
        if not e1.getPsf():
            self.assertFalse(e2.getPsf())
        else:
            self.assertEqual(e1.getPsf().getValue(), e2.getPsf().getValue())

    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall, allowUnsafe=True)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(self.detector)
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.setPsf(DummyPsf(4.0))

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)

        # Ensure that the copy was deep.
        # (actually this test is invalid since getDetector() returns a shared_ptr)
        # cen0 = exposureU.getDetector().getCenterPixel()
        # x0,y0 = cen0
        # det = exposureF.getDetector()
        # det.setCenterPixel(lsst.geom.Point2D(999.0, 437.8))
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[0], x0)
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[1], y0)

    def testDeepCopyData(self):
        """Make sure a deep copy of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        expCopy = exp.clone()
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertFloatsAlmostEqual(miCopy.getImage().getArray(), -50)
        self.assertTrue(np.all(miCopy.getMask().getArray() == 2))
        self.assertFloatsAlmostEqual(miCopy.getVariance().getArray(), 175)

        self.assertFloatsAlmostEqual(mi.getImage().getArray(), 100)
        self.assertTrue(np.all(mi.getMask().getArray() == 5))
        self.assertFloatsAlmostEqual(mi.getVariance().getArray(), 200)

    def testDeepCopySubData(self):
        """Make sure a deep copy of a subregion of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        bbox = lsst.geom.Box2I(lsst.geom.Point2I(1, 0), lsst.geom.Extent2I(5, 4))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertFloatsAlmostEqual(miCopy.getImage().getArray(), -50)
        self.assertTrue(np.all(miCopy.getMask().getArray() == 2))
        self.assertFloatsAlmostEqual(miCopy.getVariance().getArray(), 175)

        self.assertFloatsAlmostEqual(mi.getImage().getArray(), 100)
        self.assertTrue(np.all(mi.getMask().getArray() == 5))
        self.assertFloatsAlmostEqual(mi.getVariance().getArray(), 200)

    def testDeepCopyMetadata(self):
        """Make sure a deep copy of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        expCopy = exp.clone()
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.getScalar("foo"), 6)
        # this will fail if the bug is present
        self.assertEqual(expMeta.getScalar("foo"), 5)

    def testDeepCopySubMetadata(self):
        """Make sure a deep copy of a subregion of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        bbox = lsst.geom.Box2I(lsst.geom.Point2I(1, 0), lsst.geom.Extent2I(5, 5))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.getScalar("foo"), 6)
        # this will fail if the bug is present
        self.assertEqual(expMeta.getScalar("foo"), 5)

    def testMakeExposureLeaks(self):
        """Test for memory leaks in makeExposure (the test is in lsst.utils.tests.MemoryTestCase)"""
        afwImage.makeMaskedImage(afwImage.ImageU(lsst.geom.Extent2I(10, 20)))
        afwImage.makeExposure(afwImage.makeMaskedImage(
            afwImage.ImageU(lsst.geom.Extent2I(10, 20))))

    def testImageSlices(self):
        """Test image slicing, which generate sub-images using Box2I under the covers"""
        exp = afwImage.ExposureF(10, 20)
        mi = exp.getMaskedImage()
        mi.image[9, 19] = 10
        # N.b. Exposures don't support setting/getting the pixels so can't
        # replicate e.g. Image's slice tests
        sexp = exp[1:4, 6:10]
        self.assertEqual(sexp.getDimensions(), lsst.geom.ExtentI(3, 4))
        sexp = exp[:, -3:, afwImage.LOCAL]
        self.assertEqual(sexp.getDimensions(),
                         lsst.geom.ExtentI(exp.getWidth(), 3))
        self.assertEqual(sexp.maskedImage[-1, -1, afwImage.LOCAL],
                         exp.maskedImage[-1, -1, afwImage.LOCAL])

    def testConversionToScalar(self):
        """Test that even 1-pixel Exposures can't be converted to scalars"""
        im = afwImage.ExposureF(10, 20)

        # only single pixel images may be converted
        self.assertRaises(TypeError, float, im)
        # actually, can't convert (img, msk, var) to scalar
        self.assertRaises(TypeError, float, im[0, 0])

    def testReadMetadata(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            self.exposureCrWcs.getMetadata().set("FRAZZLE", True)
            # This will write the main metadata (inc. FRAZZLE) to the primary HDU, and the
            # WCS to subsequent HDUs, along with INHERIT=T.
            self.exposureCrWcs.writeFits(tmpFile)
            # This should read the first non-empty HDU (i.e. it skips the primary), but
            # goes back and reads it if it finds INHERIT=T.  That should let us read
            # frazzle and the Wcs from the PropertySet returned by
            # testReadMetadata.
            md = readMetadata(tmpFile)
            wcs = afwGeom.makeSkyWcs(md, False)
            self.assertPairsAlmostEqual(wcs.getPixelOrigin(), self.wcs.getPixelOrigin())
            self.assertSpherePointsAlmostEqual(wcs.getSkyOrigin(), self.wcs.getSkyOrigin())
            assert_allclose(wcs.getCdMatrix(), self.wcs.getCdMatrix(), atol=1e-10)
            frazzle = md.getScalar("FRAZZLE")
            self.assertTrue(frazzle)

    def testArchiveKeys(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            exposure1.writeFits(tmpFile)
            exposure2 = afwImage.ExposureF(tmpFile)
            self.assertFalse(exposure2.getMetadata().exists("AR_ID"))
            self.assertFalse(exposure2.getMetadata().exists("PSF_ID"))
            self.assertFalse(exposure2.getMetadata().exists("WCS_ID"))

    def testTicket2861(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            schema = afwTable.ExposureTable.makeMinimalSchema()
            coaddInputs = afwImage.CoaddInputs(schema, schema)
            exposure1.getInfo().setCoaddInputs(coaddInputs)
            exposure2 = afwImage.ExposureF(exposure1, True)
            self.assertIsNotNone(exposure2.getInfo().getCoaddInputs())
            exposure2.writeFits(tmpFile)
            exposure3 = afwImage.ExposureF(tmpFile)
            self.assertIsNotNone(exposure3.getInfo().getCoaddInputs())

    def testGetCutout(self):
        wcs = self.smallExposure.getWcs()

        dimensions = [lsst.geom.Extent2I(100, 50), lsst.geom.Extent2I(15, 15), lsst.geom.Extent2I(0, 10),
                      lsst.geom.Extent2I(25, 30), lsst.geom.Extent2I(15, -5),
                      2*self.smallExposure.getDimensions()]
        locations = [("center", self._getExposureCenter(self.smallExposure)),
                     ("edge", wcs.pixelToSky(lsst.geom.Point2D(0, 0))),
                     ("rounding test", wcs.pixelToSky(lsst.geom.Point2D(0.2, 0.7))),
                     ("just inside", wcs.pixelToSky(lsst.geom.Point2D(-0.5 + 1e-4, -0.5 + 1e-4))),
                     ("just outside", wcs.pixelToSky(lsst.geom.Point2D(-0.5 - 1e-4, -0.5 - 1e-4))),
                     ("outside", wcs.pixelToSky(lsst.geom.Point2D(-1000, -1000)))]
        for cutoutSize in dimensions:
            for label, cutoutCenter in locations:
                msg = 'Cutout size = %s, location = %s' % (cutoutSize, label)
                if "outside" not in label and all(cutoutSize.gt(0)):
                    cutout = self.smallExposure.getCutout(cutoutCenter, cutoutSize)
                    centerInPixels = wcs.skyToPixel(cutoutCenter)
                    precision = (1 + 1e-4)*np.sqrt(0.5)*wcs.getPixelScale(centerInPixels)
                    self._checkCutoutProperties(cutout, cutoutSize, cutoutCenter, precision, msg)
                    self._checkCutoutPixels(
                        cutout,
                        self._getValidCorners(self.smallExposure.getBBox(), cutout.getBBox()),
                        msg)

                    # Need a valid WCS
                    with self.assertRaises(pexExcept.LogicError, msg=msg):
                        self.exposureMiOnly.getCutout(cutoutCenter, cutoutSize)
                else:
                    with self.assertRaises(pexExcept.InvalidParameterError, msg=msg):
                        self.smallExposure.getCutout(cutoutCenter, cutoutSize)

    def _checkCutoutProperties(self, cutout, size, center, precision, msg):
        """Test whether a cutout has the desired size and position.

        Parameters
        ----------
        cutout : `lsst.afw.image.Exposure`
            The cutout to test.
        size : `lsst.geom.Extent2I`
            The expected dimensions of ``cutout``.
        center : `lsst.geom.SpherePoint`
            The expected center of ``cutout``.
        precision : `lsst.geom.Angle`
            The precision to which ``center`` must match.
        msg : `str`
            An error message suffix describing test parameters.
        """
        newCenter = self._getExposureCenter(cutout)
        self.assertIsNotNone(cutout, msg=msg)
        self.assertSpherePointsAlmostEqual(newCenter, center, maxSep=precision, msg=msg)
        self.assertEqual(cutout.getWidth(), size[0], msg=msg)
        self.assertEqual(cutout.getHeight(), size[1], msg=msg)

    def _checkCutoutPixels(self, cutout, validCorners, msg):
        """Test whether a cutout has valid/empty pixels where expected.

        Parameters
        ----------
        cutout : `lsst.afw.image.Exposure`
            The cutout to test.
        validCorners : iterable of `lsst.geom.Point2I`
            The corners of ``cutout`` that should be drawn from the original image.
        msg : `str`
            An error message suffix describing test parameters.
        """
        mask = cutout.getMaskedImage().getMask()
        edgeMask = mask.getPlaneBitMask("NO_DATA")

        for corner in cutout.getBBox().getCorners():
            maskBitsSet = mask[corner] & edgeMask
            if corner in validCorners:
                self.assertEqual(maskBitsSet, 0, msg=msg)
            else:
                self.assertEqual(maskBitsSet, edgeMask, msg=msg)

    def _getExposureCenter(self, exposure):
        """Return the sky coordinates of an Exposure's center.

        Parameters
        ----------
        exposure : `lsst.afw.image.Exposure`
            The image whose center is desired.

        Returns
        -------
        center : `lsst.geom.SpherePoint`
            The position at the center of ``exposure``.
        """
        return exposure.getWcs().pixelToSky(lsst.geom.Box2D(exposure.getBBox()).getCenter())

    def _getValidCorners(self, imageBox, cutoutBox):
        """Return the corners of a cutout that are constrained by the original image.

        Parameters
        ----------
        imageBox: `lsst.geom.Extent2I`
            The bounding box of the original image.
        cutoutBox : `lsst.geom.Box2I`
            The bounding box of the cutout.

        Returns
        -------
        corners : iterable of `lsst.geom.Point2I`
            The corners that are drawn from the original image.
        """
        return [corner for corner in cutoutBox.getCorners() if corner in imageBox]
Exemple #22
0
class ExposureTestCase(lsst.utils.tests.TestCase):
    """
    A test case for the Exposure Class
    """
    def setUp(self):
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        maskedImageMD = readMetadata(inFilePathSmall)

        self.smallExposure = afwImage.ExposureF(inFilePathSmall)
        self.width = maskedImage.getWidth()
        self.height = maskedImage.getHeight()
        self.wcs = afwGeom.makeSkyWcs(maskedImageMD, False)
        self.md = maskedImageMD
        self.psf = DummyPsf(2.0)
        self.detector = DetectorWrapper().detector

        self.exposureBlank = afwImage.ExposureF()
        self.exposureMiOnly = afwImage.makeExposure(maskedImage)
        self.exposureMiWcs = afwImage.makeExposure(maskedImage, self.wcs)
        # n.b. the (100, 100, ...) form
        self.exposureCrWcs = afwImage.ExposureF(100, 100, self.wcs)
        # test with ExtentI(100, 100) too
        self.exposureCrOnly = afwImage.ExposureF(lsst.geom.ExtentI(100, 100))

        afwImage.Filter.reset()
        afwImage.FilterProperty.reset()

        defineFilter("g", 470.0)

    def tearDown(self):
        del self.smallExposure
        del self.wcs
        del self.psf
        del self.detector

        del self.exposureBlank
        del self.exposureMiOnly
        del self.exposureMiWcs
        del self.exposureCrWcs
        del self.exposureCrOnly

    def testGetMaskedImage(self):
        """
        Test to ensure a MaskedImage can be obtained from each
        Exposure. An Exposure is required to have a MaskedImage,
        therefore each of the Exposures should return a MaskedImage.

        MaskedImage class should throw appropriate
        lsst::pex::exceptions::NotFound if the MaskedImage can not be
        obtained.
        """
        maskedImageBlank = self.exposureBlank.getMaskedImage()
        blankWidth = maskedImageBlank.getWidth()
        blankHeight = maskedImageBlank.getHeight()
        if blankWidth != blankHeight != 0:
            self.fail("%s = %s != 0" % (blankWidth, blankHeight))

        maskedImageMiOnly = self.exposureMiOnly.getMaskedImage()
        miOnlyWidth = maskedImageMiOnly.getWidth()
        miOnlyHeight = maskedImageMiOnly.getHeight()
        self.assertAlmostEqual(miOnlyWidth, self.width)
        self.assertAlmostEqual(miOnlyHeight, self.height)

        # NOTE: Unittests for Exposures created from a MaskedImage and
        # a WCS object are incomplete.  No way to test the validity of
        # the WCS being copied/created.

        maskedImageMiWcs = self.exposureMiWcs.getMaskedImage()
        miWcsWidth = maskedImageMiWcs.getWidth()
        miWcsHeight = maskedImageMiWcs.getHeight()
        self.assertAlmostEqual(miWcsWidth, self.width)
        self.assertAlmostEqual(miWcsHeight, self.height)

        maskedImageCrWcs = self.exposureCrWcs.getMaskedImage()
        crWcsWidth = maskedImageCrWcs.getWidth()
        crWcsHeight = maskedImageCrWcs.getHeight()
        if crWcsWidth != crWcsHeight != 0:
            self.fail("%s != %s != 0" % (crWcsWidth, crWcsHeight))

        maskedImageCrOnly = self.exposureCrOnly.getMaskedImage()
        crOnlyWidth = maskedImageCrOnly.getWidth()
        crOnlyHeight = maskedImageCrOnly.getHeight()
        if crOnlyWidth != crOnlyHeight != 0:
            self.fail("%s != %s != 0" % (crOnlyWidth, crOnlyHeight))

        # Check Exposure.getWidth() returns the MaskedImage's width
        self.assertEqual(crOnlyWidth, self.exposureCrOnly.getWidth())
        self.assertEqual(crOnlyHeight, self.exposureCrOnly.getHeight())

    def testProperties(self):
        self.assertMaskedImagesEqual(self.exposureMiOnly.maskedImage,
                                     self.exposureMiOnly.getMaskedImage())
        mi2 = afwImage.MaskedImageF(self.exposureMiOnly.getDimensions())
        mi2.image.array[:] = 5.0
        mi2.variance.array[:] = 3.0
        mi2.mask.array[:] = 0x1
        self.exposureMiOnly.maskedImage = mi2
        self.assertMaskedImagesEqual(self.exposureMiOnly.maskedImage, mi2)
        self.assertImagesEqual(self.exposureMiOnly.image,
                               self.exposureMiOnly.maskedImage.image)

        image3 = afwImage.ImageF(self.exposureMiOnly.getDimensions())
        image3.array[:] = 3.0
        self.exposureMiOnly.image = image3
        self.assertImagesEqual(self.exposureMiOnly.image, image3)

        mask3 = afwImage.MaskX(self.exposureMiOnly.getDimensions())
        mask3.array[:] = 0x2
        self.exposureMiOnly.mask = mask3
        self.assertMasksEqual(self.exposureMiOnly.mask, mask3)

        var3 = afwImage.ImageF(self.exposureMiOnly.getDimensions())
        var3.array[:] = 2.0
        self.exposureMiOnly.variance = var3
        self.assertImagesEqual(self.exposureMiOnly.variance, var3)

    def testGetWcs(self):
        """
        Test if a WCS can be obtained from each Exposure created with
        a WCS.

        Test that appropriate exceptions are thrown if a WCS is
        requested from an Exposure that was not created with a WCS.
        Python turns the pex::exceptions in the Exposure and
        MaskedImage classes into IndexErrors.

        The exposureBlank, exposureMiOnly, and exposureCrOnly
        Exposures should throw a lsst::pex::exceptions::NotFound.
        """

        self.assertFalse(self.exposureBlank.getWcs())
        self.assertFalse(self.exposureMiOnly.getWcs())

        # These two should pass
        self.exposureMiWcs.getWcs()
        self.exposureCrWcs.getWcs()

        self.assertFalse(self.exposureCrOnly.getWcs())

    def testExposureInfoConstructor(self):
        """Test the Exposure(maskedImage, exposureInfo) constructor"""
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setWcs(self.wcs)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage, exposureInfo)

        self.assertTrue(exposure.hasWcs())
        self.assertEqual(exposure.getWcs().getPixelOrigin(),
                         self.wcs.getPixelOrigin())
        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter(), gFilter)

        self.assertTrue(exposure.getInfo().hasWcs())
        self.assertEqual(exposure.getInfo().getWcs().getPixelOrigin(),
                         self.wcs.getPixelOrigin())
        self.assertEqual(exposure.getInfo().getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getInfo().getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getInfo().getFilter(), gFilter)

    def testNullWcs(self):
        """Test that an Exposure constructed with second argument None is usable

        When the exposureInfo constructor was first added, trying to get a WCS
        or other info caused a segfault because the ExposureInfo did not exist.
        """
        maskedImage = self.exposureMiOnly.getMaskedImage()
        exposure = afwImage.ExposureF(maskedImage, None)
        self.assertFalse(exposure.hasWcs())
        self.assertFalse(exposure.hasPsf())

    def testExposureInfoSetNone(self):
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setDetector(None)
        exposureInfo.setValidPolygon(None)
        exposureInfo.setPsf(None)
        exposureInfo.setWcs(None)
        exposureInfo.setCalib(None)
        exposureInfo.setCoaddInputs(None)
        exposureInfo.setVisitInfo(None)
        exposureInfo.setApCorrMap(None)

    def testSetExposureInfo(self):
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setWcs(self.wcs)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage)
        self.assertFalse(exposure.hasWcs())

        exposure.setInfo(exposureInfo)

        self.assertTrue(exposure.hasWcs())
        self.assertEqual(exposure.getWcs().getPixelOrigin(),
                         self.wcs.getPixelOrigin())
        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter(), gFilter)

    def testVisitInfoFitsPersistence(self):
        """Test saving an exposure to FITS and reading it back in preserves (some) VisitInfo fields"""
        exposureId = 5
        exposureTime = 12.3
        boresightRotAngle = 45.6 * lsst.geom.degrees
        weather = Weather(1.1, 2.2, 0.3)
        visitInfo = afwImage.VisitInfo(
            exposureId=exposureId,
            exposureTime=exposureTime,
            boresightRotAngle=boresightRotAngle,
            weather=weather,
        )
        # Calib used to have exposure time and exposure date, so check for lack
        # of interference
        calib = afwImage.Calib(3.4)
        exposureInfo = afwImage.ExposureInfo()
        exposureInfo.setVisitInfo(visitInfo)
        exposureInfo.setCalib(calib)
        exposureInfo.setDetector(self.detector)
        gFilter = afwImage.Filter("g")
        exposureInfo.setFilter(gFilter)
        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure = afwImage.ExposureF(maskedImage, exposureInfo)
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure.writeFits(tmpFile)
            rtExposure = afwImage.ExposureF(tmpFile)
        rtVisitInfo = rtExposure.getInfo().getVisitInfo()
        self.assertEqual(rtVisitInfo.getWeather(), weather)
        self.assertEqual(rtExposure.getCalib(), calib)
        self.assertEqual(rtExposure.getFilter(), gFilter)

    def testSetMembers(self):
        """
        Test that the MaskedImage and the WCS of an Exposure can be set.
        """
        exposure = afwImage.ExposureF()

        maskedImage = afwImage.MaskedImageF(inFilePathSmall)
        exposure.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)
        exposure.setDetector(self.detector)
        exposure.setFilter(afwImage.Filter("g"))

        self.assertEqual(exposure.getDetector().getName(),
                         self.detector.getName())
        self.assertEqual(exposure.getDetector().getSerial(),
                         self.detector.getSerial())
        self.assertEqual(exposure.getFilter().getName(), "g")

        try:
            exposure.getWcs()
        except pexExcept.Exception as e:
            print("caught expected exception (getWcs): %s" % e)
            pass
        #
        # Test the Calib member.  The Calib tests are in color.py, here we just check that it's in Exposure
        #
        calib = exposure.getCalib()
        fluxMag0, FluxMag0Err = 1.1e12, 2.2e10
        calib.setFluxMag0(fluxMag0, FluxMag0Err)
        self.assertEqual(exposure.getCalib().getFluxMag0(),
                         (fluxMag0, FluxMag0Err))
        #
        # now check that we can set Calib
        #
        calib = afwImage.Calib()
        fluxMag0_2, fluxMag0Err_2 = (511.1, 44.4)
        calib.setFluxMag0(fluxMag0_2, fluxMag0Err_2)

        exposure.setCalib(calib)

        self.assertEqual(exposure.getCalib().getFluxMag0(),
                         (fluxMag0_2, fluxMag0Err_2))
        #
        # Psfs next
        #
        self.assertFalse(exposure.hasPsf())
        exposure.setPsf(self.psf)
        self.assertTrue(exposure.hasPsf())

        exposure.setPsf(DummyPsf(1.0))  # we can reset the Psf

        # Test that we can set the MaskedImage and WCS of an Exposure
        # that already has both
        self.exposureMiWcs.setMaskedImage(maskedImage)
        exposure.setWcs(self.wcs)

    def testHasWcs(self):
        """
        Test if an Exposure has a WCS or not.
        """
        self.assertFalse(self.exposureBlank.hasWcs())

        self.assertFalse(self.exposureMiOnly.hasWcs())
        self.assertTrue(self.exposureMiWcs.hasWcs())
        self.assertTrue(self.exposureCrWcs.hasWcs())
        self.assertFalse(self.exposureCrOnly.hasWcs())

    def testGetSubExposure(self):
        """
        Test that a subExposure of the original Exposure can be obtained.

        The MaskedImage class should throw a
        lsst::pex::exceptions::InvalidParameter if the requested
        subRegion is not fully contained within the original
        MaskedImage.

        """
        #
        # This subExposure is valid
        #
        subBBox = lsst.geom.Box2I(lsst.geom.Point2I(40, 50),
                                  lsst.geom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(self.exposureCrWcs, subBBox,
                                                 afwImage.LOCAL)

        self.checkWcs(self.exposureCrWcs, subExposure)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class and should trigger an exception
        # from the WCS class for the MaskedImage 871034p_1_MI.

        subRegion3 = lsst.geom.Box2I(lsst.geom.Point2I(100, 100),
                                     lsst.geom.Extent2I(10, 10))

        def getSubRegion():
            self.exposureCrWcs.Factory(self.exposureCrWcs, subRegion3,
                                       afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # this subRegion is not valid and should trigger an exception
        # from the MaskedImage class only for the MaskedImage small_MI.
        # small_MI (cols, rows) = (256, 256)

        subRegion4 = lsst.geom.Box2I(lsst.geom.Point2I(250, 250),
                                     lsst.geom.Extent2I(10, 10))

        def getSubRegion():
            self.exposureCrWcs.Factory(self.exposureCrWcs, subRegion4,
                                       afwImage.LOCAL)

        self.assertRaises(pexExcept.LengthError, getSubRegion)

        # check the sub- and parent- exposures are using the same Wcs
        # transformation
        subBBox = lsst.geom.Box2I(lsst.geom.Point2I(40, 50),
                                  lsst.geom.Extent2I(10, 10))
        subExposure = self.exposureCrWcs.Factory(self.exposureCrWcs, subBBox,
                                                 afwImage.LOCAL)
        parentSkyPos = self.exposureCrWcs.getWcs().pixelToSky(0, 0)

        subExpSkyPos = subExposure.getWcs().pixelToSky(0, 0)

        self.assertSpherePointsAlmostEqual(parentSkyPos,
                                           subExpSkyPos,
                                           msg="Wcs in sub image has changed")

    def testReadWriteFits(self):
        """Test readFits and writeFits.
        """
        # This should pass without an exception
        mainExposure = afwImage.ExposureF(inFilePathSmall)
        mainExposure.setDetector(self.detector)

        subBBox = lsst.geom.Box2I(lsst.geom.Point2I(10, 10),
                                  lsst.geom.Extent2I(40, 50))
        subExposure = mainExposure.Factory(mainExposure, subBBox,
                                           afwImage.LOCAL)
        self.checkWcs(mainExposure, subExposure)
        det = subExposure.getDetector()
        self.assertTrue(det)

        subExposure = afwImage.ExposureF(inFilePathSmall, subBBox,
                                         afwImage.LOCAL)

        self.checkWcs(mainExposure, subExposure)

        # This should throw an exception
        def getExposure():
            afwImage.ExposureF(inFilePathSmallImage)

        self.assertRaises(FitsError, getExposure)

        mainExposure.setPsf(self.psf)

        # Make sure we can write without an exception
        fluxMag0, fluxMag0Err = 1e12, 1e10
        mainExposure.getCalib().setFluxMag0(fluxMag0, fluxMag0Err)

        # Check scaling of Calib
        scale = 2.0
        calib = mainExposure.getCalib()
        self.assertEqual((fluxMag0, fluxMag0Err), calib.getFluxMag0())
        self.assertEqual((fluxMag0, fluxMag0Err),
                         mainExposure.getCalib().getFluxMag0())
        calib *= scale
        self.assertEqual((fluxMag0 * scale, fluxMag0Err * scale),
                         calib.getFluxMag0())
        self.assertEqual((fluxMag0 * scale, fluxMag0Err * scale),
                         mainExposure.getCalib().getFluxMag0())
        calib /= scale
        self.assertEqual((fluxMag0, fluxMag0Err), calib.getFluxMag0())
        self.assertEqual((fluxMag0, fluxMag0Err),
                         mainExposure.getCalib().getFluxMag0())

        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            mainExposure.writeFits(tmpFile)

            readExposure = type(mainExposure)(tmpFile)

            #
            # Check the round-tripping
            #
            self.assertEqual(mainExposure.getFilter().getName(),
                             readExposure.getFilter().getName())

            self.assertEqual((fluxMag0, fluxMag0Err),
                             readExposure.getCalib().getFluxMag0())

            psf = readExposure.getPsf()
            self.assertIsNotNone(psf)
            self.assertEqual(psf.getValue(), self.psf.getValue())

    def checkWcs(self, parentExposure, subExposure):
        """Compare WCS at corner points of a sub-exposure and its parent exposure
           By using the function indexToPosition, we should be able to convert the indices
           (of the four corners (of the sub-exposure)) to positions and use the wcs
           to get the same sky coordinates for each.
        """
        subMI = subExposure.getMaskedImage()
        subDim = subMI.getDimensions()

        # Note: pixel positions must be computed relative to XY0 when working
        # with WCS
        mainWcs = parentExposure.getWcs()
        subWcs = subExposure.getWcs()

        for xSubInd in (0, subDim.getX() - 1):
            for ySubInd in (0, subDim.getY() - 1):
                self.assertSpherePointsAlmostEqual(
                    mainWcs.pixelToSky(
                        afwImage.indexToPosition(xSubInd),
                        afwImage.indexToPosition(ySubInd),
                    ),
                    subWcs.pixelToSky(
                        afwImage.indexToPosition(xSubInd),
                        afwImage.indexToPosition(ySubInd),
                    ))

    def cmpExposure(self, e1, e2):
        self.assertEqual(e1.getDetector().getName(),
                         e2.getDetector().getName())
        self.assertEqual(e1.getDetector().getSerial(),
                         e2.getDetector().getSerial())
        self.assertEqual(e1.getFilter().getName(), e2.getFilter().getName())
        xy = lsst.geom.Point2D(0, 0)
        self.assertEqual(e1.getWcs().pixelToSky(xy)[0],
                         e2.getWcs().pixelToSky(xy)[0])
        self.assertEqual(e1.getCalib(), e2.getCalib())
        # check PSF identity
        if not e1.getPsf():
            self.assertFalse(e2.getPsf())
        else:
            self.assertEqual(e1.getPsf().getValue(), e2.getPsf().getValue())

    def testCopyExposure(self):
        """Copy an Exposure (maybe changing type)"""

        exposureU = afwImage.ExposureU(inFilePathSmall, allowUnsafe=True)
        exposureU.setWcs(self.wcs)
        exposureU.setDetector(self.detector)
        exposureU.setFilter(afwImage.Filter("g"))
        exposureU.setPsf(DummyPsf(4.0))

        exposureF = exposureU.convertF()
        self.cmpExposure(exposureF, exposureU)

        nexp = exposureF.Factory(exposureF, False)
        self.cmpExposure(exposureF, nexp)

        # Ensure that the copy was deep.
        # (actually this test is invalid since getDetector() returns a shared_ptr)
        # cen0 = exposureU.getDetector().getCenterPixel()
        # x0,y0 = cen0
        # det = exposureF.getDetector()
        # det.setCenterPixel(lsst.geom.Point2D(999.0, 437.8))
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[0], x0)
        # self.assertEqual(exposureU.getDetector().getCenterPixel()[1], y0)

    def testDeepCopyData(self):
        """Make sure a deep copy of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        expCopy = exp.clone()
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertFloatsAlmostEqual(miCopy.getImage().getArray(), -50)
        self.assertTrue(np.all(miCopy.getMask().getArray() == 2))
        self.assertFloatsAlmostEqual(miCopy.getVariance().getArray(), 175)

        self.assertFloatsAlmostEqual(mi.getImage().getArray(), 100)
        self.assertTrue(np.all(mi.getMask().getArray() == 5))
        self.assertFloatsAlmostEqual(mi.getVariance().getArray(), 200)

    def testDeepCopySubData(self):
        """Make sure a deep copy of a subregion of an Exposure has its own data (ticket #2625)
        """
        exp = afwImage.ExposureF(6, 7)
        mi = exp.getMaskedImage()
        mi.getImage().set(100)
        mi.getMask().set(5)
        mi.getVariance().set(200)

        bbox = lsst.geom.Box2I(lsst.geom.Point2I(1, 0),
                               lsst.geom.Extent2I(5, 4))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        miCopy = expCopy.getMaskedImage()
        miCopy.getImage().set(-50)
        miCopy.getMask().set(2)
        miCopy.getVariance().set(175)

        self.assertFloatsAlmostEqual(miCopy.getImage().getArray(), -50)
        self.assertTrue(np.all(miCopy.getMask().getArray() == 2))
        self.assertFloatsAlmostEqual(miCopy.getVariance().getArray(), 175)

        self.assertFloatsAlmostEqual(mi.getImage().getArray(), 100)
        self.assertTrue(np.all(mi.getMask().getArray() == 5))
        self.assertFloatsAlmostEqual(mi.getVariance().getArray(), 200)

    def testDeepCopyMetadata(self):
        """Make sure a deep copy of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        expCopy = exp.clone()
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.getScalar("foo"), 6)
        # this will fail if the bug is present
        self.assertEqual(expMeta.getScalar("foo"), 5)

    def testDeepCopySubMetadata(self):
        """Make sure a deep copy of a subregion of an Exposure has a deep copy of metadata (ticket #2568)
        """
        exp = afwImage.ExposureF(10, 10)
        expMeta = exp.getMetadata()
        expMeta.set("foo", 5)
        bbox = lsst.geom.Box2I(lsst.geom.Point2I(1, 0),
                               lsst.geom.Extent2I(5, 5))
        expCopy = exp.Factory(exp, bbox, afwImage.PARENT, True)
        expCopyMeta = expCopy.getMetadata()
        expCopyMeta.set("foo", 6)
        self.assertEqual(expCopyMeta.getScalar("foo"), 6)
        # this will fail if the bug is present
        self.assertEqual(expMeta.getScalar("foo"), 5)

    def testMakeExposureLeaks(self):
        """Test for memory leaks in makeExposure (the test is in lsst.utils.tests.MemoryTestCase)"""
        afwImage.makeMaskedImage(afwImage.ImageU(lsst.geom.Extent2I(10, 20)))
        afwImage.makeExposure(
            afwImage.makeMaskedImage(
                afwImage.ImageU(lsst.geom.Extent2I(10, 20))))

    def testImageSlices(self):
        """Test image slicing, which generate sub-images using Box2I under the covers"""
        exp = afwImage.ExposureF(10, 20)
        mi = exp.getMaskedImage()
        mi.image[9, 19] = 10
        # N.b. Exposures don't support setting/getting the pixels so can't
        # replicate e.g. Image's slice tests
        sexp = exp[1:4, 6:10]
        self.assertEqual(sexp.getDimensions(), lsst.geom.ExtentI(3, 4))
        sexp = exp[:, -3:, afwImage.LOCAL]
        self.assertEqual(sexp.getDimensions(),
                         lsst.geom.ExtentI(exp.getWidth(), 3))
        self.assertEqual(sexp.maskedImage[-1, -1, afwImage.LOCAL],
                         exp.maskedImage[-1, -1, afwImage.LOCAL])

    def testConversionToScalar(self):
        """Test that even 1-pixel Exposures can't be converted to scalars"""
        im = afwImage.ExposureF(10, 20)

        # only single pixel images may be converted
        self.assertRaises(TypeError, float, im)
        # actually, can't convert (img, msk, var) to scalar
        self.assertRaises(TypeError, float, im[0, 0])

    def testReadMetadata(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            self.exposureCrWcs.getMetadata().set("FRAZZLE", True)
            # This will write the main metadata (inc. FRAZZLE) to the primary HDU, and the
            # WCS to subsequent HDUs, along with INHERIT=T.
            self.exposureCrWcs.writeFits(tmpFile)
            # This should read the first non-empty HDU (i.e. it skips the primary), but
            # goes back and reads it if it finds INHERIT=T.  That should let us read
            # frazzle and the Wcs from the PropertySet returned by
            # testReadMetadata.
            md = readMetadata(tmpFile)
            wcs = afwGeom.makeSkyWcs(md, False)
            self.assertPairsAlmostEqual(wcs.getPixelOrigin(),
                                        self.wcs.getPixelOrigin())
            self.assertSpherePointsAlmostEqual(wcs.getSkyOrigin(),
                                               self.wcs.getSkyOrigin())
            assert_allclose(wcs.getCdMatrix(),
                            self.wcs.getCdMatrix(),
                            atol=1e-10)
            frazzle = md.getScalar("FRAZZLE")
            self.assertTrue(frazzle)

    def testArchiveKeys(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            exposure1.writeFits(tmpFile)
            exposure2 = afwImage.ExposureF(tmpFile)
            self.assertFalse(exposure2.getMetadata().exists("AR_ID"))
            self.assertFalse(exposure2.getMetadata().exists("PSF_ID"))
            self.assertFalse(exposure2.getMetadata().exists("WCS_ID"))

    def testTicket2861(self):
        with lsst.utils.tests.getTempFilePath(".fits") as tmpFile:
            exposure1 = afwImage.ExposureF(100, 100, self.wcs)
            exposure1.setPsf(self.psf)
            schema = afwTable.ExposureTable.makeMinimalSchema()
            coaddInputs = afwImage.CoaddInputs(schema, schema)
            exposure1.getInfo().setCoaddInputs(coaddInputs)
            exposure2 = afwImage.ExposureF(exposure1, True)
            self.assertIsNotNone(exposure2.getInfo().getCoaddInputs())
            exposure2.writeFits(tmpFile)
            exposure3 = afwImage.ExposureF(tmpFile)
            self.assertIsNotNone(exposure3.getInfo().getCoaddInputs())

    def testGetCutout(self):
        wcs = self.smallExposure.getWcs()

        dimensions = [
            lsst.geom.Extent2I(100, 50),
            lsst.geom.Extent2I(15, 15),
            lsst.geom.Extent2I(0, 10),
            lsst.geom.Extent2I(25, 30),
            lsst.geom.Extent2I(15, -5), 2 * self.smallExposure.getDimensions()
        ]
        locations = [
            ("center", self._getExposureCenter(self.smallExposure)),
            ("edge", wcs.pixelToSky(lsst.geom.Point2D(0, 0))),
            ("rounding test", wcs.pixelToSky(lsst.geom.Point2D(0.2, 0.7))),
            ("just inside",
             wcs.pixelToSky(lsst.geom.Point2D(-0.5 + 1e-4, -0.5 + 1e-4))),
            ("just outside",
             wcs.pixelToSky(lsst.geom.Point2D(-0.5 - 1e-4, -0.5 - 1e-4))),
            ("outside", wcs.pixelToSky(lsst.geom.Point2D(-1000, -1000)))
        ]
        for cutoutSize in dimensions:
            for label, cutoutCenter in locations:
                msg = 'Cutout size = %s, location = %s' % (cutoutSize, label)
                if "outside" not in label and all(cutoutSize.gt(0)):
                    cutout = self.smallExposure.getCutout(
                        cutoutCenter, cutoutSize)
                    centerInPixels = wcs.skyToPixel(cutoutCenter)
                    precision = (1 + 1e-4) * np.sqrt(0.5) * wcs.getPixelScale(
                        centerInPixels)
                    self._checkCutoutProperties(cutout, cutoutSize,
                                                cutoutCenter, precision, msg)
                    self._checkCutoutPixels(
                        cutout,
                        self._getValidCorners(self.smallExposure.getBBox(),
                                              cutout.getBBox()), msg)

                    # Need a valid WCS
                    with self.assertRaises(pexExcept.LogicError, msg=msg):
                        self.exposureMiOnly.getCutout(cutoutCenter, cutoutSize)
                else:
                    with self.assertRaises(pexExcept.InvalidParameterError,
                                           msg=msg):
                        self.smallExposure.getCutout(cutoutCenter, cutoutSize)

    def _checkCutoutProperties(self, cutout, size, center, precision, msg):
        """Test whether a cutout has the desired size and position.

        Parameters
        ----------
        cutout : `lsst.afw.image.Exposure`
            The cutout to test.
        size : `lsst.geom.Extent2I`
            The expected dimensions of ``cutout``.
        center : `lsst.geom.SpherePoint`
            The expected center of ``cutout``.
        precision : `lsst.geom.Angle`
            The precision to which ``center`` must match.
        msg : `str`
            An error message suffix describing test parameters.
        """
        newCenter = self._getExposureCenter(cutout)
        self.assertIsNotNone(cutout, msg=msg)
        self.assertSpherePointsAlmostEqual(newCenter,
                                           center,
                                           maxSep=precision,
                                           msg=msg)
        self.assertEqual(cutout.getWidth(), size[0], msg=msg)
        self.assertEqual(cutout.getHeight(), size[1], msg=msg)

    def _checkCutoutPixels(self, cutout, validCorners, msg):
        """Test whether a cutout has valid/empty pixels where expected.

        Parameters
        ----------
        cutout : `lsst.afw.image.Exposure`
            The cutout to test.
        validCorners : iterable of `lsst.geom.Point2I`
            The corners of ``cutout`` that should be drawn from the original image.
        msg : `str`
            An error message suffix describing test parameters.
        """
        mask = cutout.getMaskedImage().getMask()
        edgeMask = mask.getPlaneBitMask("NO_DATA")

        for corner in cutout.getBBox().getCorners():
            maskBitsSet = mask[corner] & edgeMask
            if corner in validCorners:
                self.assertEqual(maskBitsSet, 0, msg=msg)
            else:
                self.assertEqual(maskBitsSet, edgeMask, msg=msg)

    def _getExposureCenter(self, exposure):
        """Return the sky coordinates of an Exposure's center.

        Parameters
        ----------
        exposure : `lsst.afw.image.Exposure`
            The image whose center is desired.

        Returns
        -------
        center : `lsst.geom.SpherePoint`
            The position at the center of ``exposure``.
        """
        return exposure.getWcs().pixelToSky(
            lsst.geom.Box2D(exposure.getBBox()).getCenter())

    def _getValidCorners(self, imageBox, cutoutBox):
        """Return the corners of a cutout that are constrained by the original image.

        Parameters
        ----------
        imageBox: `lsst.geom.Extent2I`
            The bounding box of the original image.
        cutoutBox : `lsst.geom.Box2I`
            The bounding box of the cutout.

        Returns
        -------
        corners : iterable of `lsst.geom.Point2I`
            The corners that are drawn from the original image.
        """
        return [
            corner for corner in cutoutBox.getCorners() if corner in imageBox
        ]
Exemple #23
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 def comparePsfs(self, psf1, psf2):
     psf1 = DummyPsf.swigConvert(psf1)
     psf2 = DummyPsf.swigConvert(psf2)
     self.assertIsNotNone(psf1)
     self.assertIsNotNone(psf2)
     self.assertEqual(psf1.getValue(), psf2.getValue())
 def comparePsfs(self, psf1, psf2):
     psf1 = DummyPsf.swigConvert(psf1)
     psf2 = DummyPsf.swigConvert(psf2)
     self.assert_(psf1 is not None)
     self.assert_(psf2 is not None)
     self.assertEqual(psf1.getValue(), psf2.getValue())