def _image_parameters(self, index):
"""
Get the image parameters for the sidd at `index`.
Parameters
----------
index
Returns
-------
(int, int, str, numpy.dtype, Union[bool, callable], str, tuple, tuple)
pixel_size - the size of each pixel in bytes.
abpp - the actual bits per pixel.
irep - the image representation
dtype - the data type.
complex_type -
pv_type - the pixel type string.
band_count - the number of bands
irepband - the image representation.
im_segments - Segmentation of the form `((row start, row end, column start, column end))`
"""
sidd = self.sidd_meta[index]
assert isinstance(sidd, (SIDDType, SIDDType1))
if sidd.Display.PixelType == 'MONO8I':
pixel_size = 1
abpp = 8
irep = 'MONO'
dtype = numpy.dtype('>u1')
complex_type = False
pv_type = 'INT'
band_count = 1
irepband = ('M', )
elif sidd.Display.PixelType == 'MONO16I':
pixel_size = 2
abpp = 16
irep = 'MONO'
dtype = numpy.dtype('>u1')
complex_type = False
pv_type = 'INT'
band_count = 1
irepband = ('M', )
elif sidd.Display.PixelType == 'RGB24I':
pixel_size = 3
abpp = 8
irep = 'RGB'
dtype = numpy.dtype('>u1')
complex_type = False
pv_type = 'INT'
band_count = 3
irepband = ('R', 'G', 'B')
else:
raise ValueError('Unsupported PixelType {}'.format(
sidd.Display.PixelType))
image_segment_limits = image_segmentation(
sidd.Measurement.PixelFootprint.Row,
sidd.Measurement.PixelFootprint.Col, pixel_size)
return pixel_size, abpp, irep, dtype, complex_type, pv_type, band_count, irepband, image_segment_limits
def _image_parameters(self):
"""
Get the image parameters.
Returns
-------
(int, numpy.dtype, Union[bool, callable], str, tuple, tuple)
pixel_size - the size of each pixel in bytes.
dtype - the data type.
transform_data - the transform_data parameters
pv_type - the pixel type string.
isubcat - the image subcategory.
im_segments - Segmentation of the form `((row start, row end, column start, column end))`
"""
pixel_type = self.sicd_meta.ImageData.PixelType # required to be defined
# NB: SICDs are required to be stored as big-endian, so the endian-ness
# of the memmap must be explicit
if pixel_type == 'RE32F_IM32F':
pv_type, isubcat = 'R', ('I', 'Q')
pixel_size = 8
dtype = numpy.dtype('>f4')
transform_data = 'COMPLEX'
elif pixel_type == 'RE16I_IM16I':
pv_type, isubcat = 'SI', ('I', 'Q')
pixel_size = 4
dtype = numpy.dtype('>i2')
transform_data = complex_to_int
elif pixel_type == 'AMP8I_PHS8I':
pv_type, isubcat = 'INT', ('M', 'P')
pixel_size = 2
dtype = numpy.dtype('>u1')
transform_data = complex_to_amp_phase(
self.sicd_meta.ImageData.AmpTable)
else:
raise ValueError('Got unhandled pixel_type {}'.format(pixel_type))
image_segment_limits = image_segmentation(
self.sicd_meta.ImageData.NumRows, self.sicd_meta.ImageData.NumCols,
pixel_size)
return pixel_size, dtype, transform_data, pv_type, isubcat, image_segment_limits