def run(cls, config):
"""Execute the sky compress step, opening the input FITS file first.
Need to override the PixCorrectImStep version since this step has no
output version of the image.
"""
in_fname = config.get(cls.step_name, 'in')
try:
ccdnum = config.getint(cls.step_name, 'ccdnum')
image = DESImage.load(in_fname, ccdnum=ccdnum)
except NoOptionError:
image = DESImage.load(in_fname)
ret_code = cls.step_run(image, config)
return ret_code
def test_nullop_im(self):
with temp_pixcorrect_test_dir() as temp_dir:
config = self.new_config(temp_dir)
self.add_nullop_im_config(config)
pix_corrector = PixCorrectIm(config)
logger.debug('Doing nullop_im')
pix_corrector()
test_im = DESImage.load( config.get('pixcorrect_im', 'out') )
ref_im = DESImage.load( path.join(ref_dir, 'scix.fits') )
im_cmp = ref_im.compare( test_im )
logger.info("Nullop_Im results")
logger.debug(str(im_cmp.header))
im_cmp.log(logger, ref_im)
self.assertTrue(im_cmp.match())
def test_bias(self):
with temp_pixcorrect_test_dir() as temp_dir:
config = self.new_config(temp_dir)
self.add_bpm_config(config)
self.add_bias_config(config)
pix_corrector = PixCorrectIm(config)
logger.info('Doing bias correction')
pix_corrector()
test_im = DESImage.load( config.get('pixcorrect_im', 'out') )
ref_im = DESImage.load( path.join(ref_dir, 'post_bias.fits') )
in_im = DESImage.load( path.join(ref_dir, 'scix.fits') )
im_cmp = ref_im.compare( test_im )
logger.debug(str(im_cmp.header))
im_cmp.log(logger, ref_im)
self.assertTrue(im_cmp.match())
def __call__(self):
"""
Run row_interp and null_weights in one step, we run the tasks
by calling step_run in each class
"""
t0 = time.time()
# Get the science image
input_image = self.config.get(self.config_section, 'in')
self.sci = DESImage.load(input_image)
# Run null_weights
t1 = time.time()
logger.info("Running null_weights on: %s", input_image)
null_weights.step_run(self.sci, self.config)
logger.info("Time NullWeights : %s", elapsed_time(t1))
# Run row_interp
t2 = time.time()
logger.info("Running row_interp on: %s", input_image)
row_interp.step_run(self.sci, self.config)
logger.info("Time RowInterp : %s", elapsed_time(t2))
# Write out the image
output_image = self.config.get(self.config_section, 'out')
self.sci.save(output_image)
logger.info("Wrote new file: %s", output_image)
logger.info("Time Total: %s", elapsed_time(t0))
return 0
def change_head(self, FileN, catalog, image, outname, CCD, **args):
ccdLen = len(CCD)
#Getting the data and saving into an array
o = open(FileN, 'r').read().splitlines()
info_array = ['CRVAL1','CRVAL2','CRPIX1','CRPIX2','CD1_1','CD1_2','CD2_1','CD2_2',\
'PV1_0','PV1_1 ','PV1_2','PV1_4','PV1_5','PV1_6','PV1_7','PV1_8','PV1_9','PV1_10',\
'PV2_0','PV2_1 ','PV2_2','PV2_4','PV2_5','PV2_6','PV2_7','PV2_8','PV2_9','PV2_10']
n = len(info_array)
matrix = []
for ii in o:
for oo in info_array:
if oo in ii.split('=')[0]:
#print ii.split('=')[0], ii.split('=')[1].split('/')[0]
matrix.append(ii.split('=')[1].split('/')[0])
matrix = np.array(matrix)
#changing the header
cont = 0
for i in range(ccdLen):
ccdstring = "%02d" % int(CCD[i])
args['ccd'] = ccdstring
catalog1 = self.template_file.format(
**args) + '_' + catalog + '.fits'
image1 = self.template_file.format(**args) + '_' + image + '.fits'
(fwhm_, ellip, count) = self.fwhm(catalog1, 0)
h = DESImage.load(image1)
h.header['FWHM'] = fwhm_
h.header['ELLIPTIC'] = ellip
h.header['SCAMPFLG'] = 0
im = h.data
iterate1 = stats.sigmaclip(im, 5, 5)[0]
iterate2 = stats.sigmaclip(iterate1, 5, 5)[0]
iterate3 = stats.sigmaclip(iterate2, 3, 3)[0]
skybrite = np.median(iterate3)
skysigma = np.std(iterate3)
h.header['SKYBRITE'] = skybrite
h.header['SKYSIGMA'] = skysigma
h.header['CAMSYM'] = 'D'
h.header['SCAMPCHI'] = 0.0
h.header['SCAMPNUM'] = 0
for j in range(n):
h.header[info_array[j]] = float(matrix[cont])
cont = cont + 1
h.save(
self.template_file.format(**args) + '_' + outname +
'.fits')
def change_head(File, catalog, image, CCD, **args):
ccdLen = len(CCD)
#Getting the data and saving into an array
o = open(File,'r').read().splitlines()
info_array = ['CRVAL1','CRVAL2','CRPIX1','CRPIX2','CD1_1','CD1_2','CD2_1','CD2_2',\
'PV1_0','PV1_1 ','PV1_2','PV1_4','PV1_5','PV1_6','PV1_7','PV1_8','PV1_9','PV1_10',\
'PV2_0','PV2_1 ','PV2_2','PV2_4','PV2_5','PV2_6','PV2_7','PV2_8','PV2_9','PV2_10']
n = len(info_array)
matrix = []
for ii in o:
for oo in info_array:
if oo in ii.split('=')[0] :
#print ii.split('=')[0], ii.split('=')[1].split('/')[0]
matrix.append(ii.split('=')[1].split('/')[0])
matrix = np.array(matrix)
#changing the header
cont = 0
for i in range(ccdLen):
ccdstring="%02d"%int(CCD[i])
args['ccd']=ccdstring
catalog1 = template_file.format(**args)+'_'+catalog+'.fits'
image1 = template_file.format(**args)+'_'+image+'.fits'
fwhm_, ellip, count = fwhm(catalog1)
h=DESImage.load(image1)
h.header['FWHM'] = fwhm_
h.header['ELLIPTIC'] = ellip
h.header['SCAMPFLG'] = 0
h1=pyfits.open(image1)
im=h1[0].data
iterate1=stats.sigmaclip(im,5,5)[0]
iterate2=stats.sigmaclip(iterate1,5,5)[0]
iterate3=stats.sigmaclip(iterate2,3,3)[0]
skybrite=np.median(iterate3)
skysigma=np.std(iterate3)
h.header['SKYBRITE'] = skybrite
h.header['SKYSIGMA'] = skysigma
h.header['CAMSYM'] = 'D'
h.header['SCAMPCHI'] = 0.0
h.header['SCAMPNUM'] = 0
for j in range(n):
h.header[info_array[j]] = float(matrix[cont])
cont = cont + 1
h.save(template_file.format(**args)+'_wcs.fits')
def step_run(cls, image, config):
"""Customized execution for application of the Bias
:Parameters:
- `image`: the DESImage on which to operate
- `flat`: the bias image to apply
"""
flat_fname = config.get(cls.step_name, 'flat')
logger.info('Reading flat correction from %s' % flat_fname)
flat_im = DESImage.load(flat_fname)
ret_code = cls.__call__(image, flat_im)
return ret_code
def step_run(cls, image, config):
"""Customized execution for application of the Bias
:Parameters:
- `image`: the DESImage on which to operate
- `bias`: the bias image to apply
"""
bias_fname = config.get(cls.step_name, 'bias')
logger.info('reading Bias from %s' % bias_fname)
bias_im = DESImage.load(bias_fname)
ret_code = cls.__call__(image, bias_im)
return ret_code
def step_run(cls, image, config):
"""Customized execution for taking difference between an image and a comparison
:Parameters:
- `image`: the DESImage on which to operate
- `comp`: the comparison image (to be subtracted)
"""
comp_fname = config.get(cls.step_name, 'comp')
logger.info('reading Comparison image from %s', comp_fname)
comp_im = DESImage.load(comp_fname)
ret_code = cls.__call__(image, comp_im)
return ret_code
def step_run(cls, image, config):
"""Customized execution for addition of a weight plane.
:Parameters:
- `image`: the DESImage on which to operate
- `config`: the configuration from which to get other parameters
"""
logger.info('Weight will be added to %s' % image)
flat_fname = config.get(cls.step_name, 'flat')
logger.info('Reading flat correction from %s' % flat_fname)
flat = DESImage.load(flat_fname)
ret_code = cls.__call__(image, flat)
return ret_code
def run_updateWCS(args):
# Attempt to populate FWHM, ELLIPTIC, NFWHMCNT keywords
if args.fwhm:
new_record = get_fwhm_from_catalog(args.fwhm,
verbose=args.verbose,
debug=args.debug)
else:
new_record = {}
# Populate the new record with the XML and transalte into fitsio records format
if args.xml:
new_record = slurp_XML(args.xml,
new_record,
verbose=args.verbose,
debug=args.debug,
translate=True)
else:
new_record = []
# Read in the input fits file using despyfits.DESImage
input_image = DESImage.load(args.input)
# run the main header updater
input_image = run_update(input_image,
headfile=args.headfile,
hdupcfg=args.hdupcfg,
verbose=args.verbose,
new_record=new_record)
# if desepoch option, we add a DESPOCH record only the SCI plane
if args.desepoch:
desepoch_rec = {
'name': 'DESEPOCH',
'value': args.desepoch,
'comment': 'DES Observing epoch'
}
print(f"(updateWCS): Updating DESEPOCH={args.desepoch} to SCI header")
input_image.header.add_record(desepoch_rec)
# Saving the image as args.output, we compute the corners at write time
print(f"(updateWCS): Closing/Saving image --> {args.output}")
input_image.save(args.output)
def step_run(cls, image, config):
"""Customized execution for application of the Flat
:Parameters:
- `image`: the DESImage on which to operate
- `flat`: the bias image to apply
"""
flat_fname = config.get(cls.step_name, 'flat')
logger.info('Reading flat correction from %s' % flat_fname)
flat_im = DESImage.load(flat_fname)
# At present the only way to acquire gains is when function is run through
# tandem operation with gain_correct. In the absence of having relative gains
# an empty dictionary is passed here.
rel_gain_for_flat = {}
ret_code = cls.__call__(image, flat_im, rel_gain_for_flat)
return ret_code
def sextractorPSF(name, name1, outname, filepsf, CCD, **args):
args['ccd'] = CCD
h = DESImage.load(template_file.format(**args) + '_' + str(name) + '.fits')
fwhm = 0.263 * float(h.header['FWHM'])
cmd = 'sex ' + template_file.format(**args)+'_'+name+'.fits[0]'+\
' -PSF_NAME ' + template_file.format(**args)+'_'+filepsf+\
' -c ' + configFile2 + ' -FILTER_NAME ' + sexconvFile2 + ' -STARNNW_NAME ' +sexnnwFile + ' -CATALOG_NAME ' + template_file.format(**args)+'_'+outname+'.fits'+\
' -FLAG_IMAGE ' + template_file.format(**args)+'_'+name+'.fits[1] -PARAMETERS_NAME ' + sexparamFile_2 +\
' -INTERP_TYPE VAR_ONLY -INTERP_MAXXLAG 4 -INTERP_MAXYLAG 4 -SEEING_FWHM ' + str(fwhm) +\
' -DETECT_THRESH 1.5 -SATUR_KEY SATURATE -CATALOG_TYPE FITS_LDAC -WEIGHT_IMAGE '+\
template_file.format(**args)+'_'+name1+'.fits[2],'+template_file.format(**args)+'_'+name1+'.fits[2]'+\
' -WEIGHT_TYPE MAP_WEIGHT -CHECKIMAGE_NAME ' + template_file.format(**args)+'_segmap.fits -CHECKIMAGE_TYPE SEGMENTATION'
print '\n', cmd, '\n'
retval = subprocess.call(cmd.split(), stderr=subprocess.STDOUT)
if retval != 0:
sys.exit(1)
return
def step_run(cls, image, config):
"""Customized execution for sky subtraction
:Parameters:
- `config`: the configuration from which to get other parameters
"""
# Passing config to the class
cls.config = config
if config.has_option(cls.step_name, 'fitfilename'):
fit_filename = config.get(cls.step_name, 'fitfilename')
else:
fit_filename = None
if config.has_option(cls.step_name, 'pcfilename'):
pc_filename = config.get(cls.step_name, 'pcfilename')
else:
pc_filename = None
weight = config.get(cls.step_name, 'weight')
if config.has_option(cls.step_name, 'domefilename'):
dome_filename = config.get(cls.step_name, 'domefilename')
dome = DESImage.load(dome_filename)
else:
dome = None
if config.has_option(cls.step_name, 'skymodel'):
skymodel_filename = config.get(cls.step_name, 'skymodel')
else:
skymodel_filename = None
logger.info('Sky fitting output to %s', image)
ret_code = cls.__call__(image, fit_filename, pc_filename, weight, dome,
skymodel_filename)
return ret_code
def __call__(self):
"""
Run row_zipper and null_weights in one step, we run the tasks
by calling step_run in each class
"""
t0 = time.time()
# Check if we want special multi-epoch weighting, and which bits we want to 'save'
me_wgt_keepmask = get_safe_boolean('me_wgt_keepmask', self.config, self.config_section)
# Get verbose
try:
verbose = self.config.get(self.config_section, 'verbose')
except:
verbose = False
# Get the science image
input_image = self.config.get(self.config_section, 'in')
self.sci = DESImage.load(input_image)
# In case a streak table is provided -- we proceed with the extra STREAK maskinh
streak_file = self.config.get(self.config_section, 'streak_file')
if os.path.exists(streak_file):
add_width = self.config.getfloat(self.config_section, 'add_width')
add_length = self.config.getfloat(self.config_section, 'add_length')
max_extrapolate = self.config.getfloat(self.config_section, 'max_extrapolate')
self.streakMask(streak_file,
addWidth=add_width,
addLength=add_length,
maxExtrapolate=max_extrapolate)
# Add TILENAME and TILEID to sci header (optional) if required
self.update_sci_header(input_image)
# Update the header wcs if both headfile and hdupcfg are present (optional)
self.update_wcs_header(input_image, verbose=verbose)
# Check if want to create the custon weight for SWArp/SExtractor combination
if me_wgt_keepmask:
self.custom_weight(input_image)
# Run null_weights
t1 = time.time()
logger.info("Running null_weights on: %s", input_image)
null_weights.step_run(self.sci, self.config)
logger.info("Time NullWeights : %s", elapsed_time(t1))
# Run row_zipper
t2 = time.time()
logger.info("Running row_zipper on: %s", input_image)
row_zipper.step_run(self.sci, self.config)
logger.info("Time ZipperInterp : %s", elapsed_time(t2))
# Null the sci image only if null_mask_sci !=0
self.null_sci(input_image)
output_image = self.config.get(self.config_section, 'out')
# Special write out
if me_wgt_keepmask:
self.custom_write(output_image)
else:
self.sci.save(output_image)
logger.info("Wrote new file: %s", output_image)
logger.info("Time Total: %s", elapsed_time(t0))
return 0
def __call__(self):
"""Do image-by-image pixel level corrections
"""
# All the code here, asside from one call for each step, should
# be assiciated with shoveling data between steps. Everything else should
# take inside the code for its respective step.
# Get the science image
self.sci = DESImage.load(self.config.get('pixcorrect_cp', 'in'))
# Bias subtraction
if self.do_step('bias'):
self._check_return(bias_correct(self.sci, self.bias))
self.clean_im('bias')
# Linearization
if self.do_step('lincor'):
lincor_fname = self.config.get('pixcorrect_cp', 'lincor')
self._check_return(linearity_correct(self.sci, lincor_fname))
# Make the mask plane and mark saturated pixels. Note that flags
# are set to mark saturated pixels and keep any previously existing mask bits.
if self.do_step('bpm'):
self._check_return(
make_mask(self.sci, self.bpm, saturate=True, clear=False))
flat_gaincorrect = self.config.getboolean('pixcorrect_cp',
'flat_gaincorrect')
# get gains ahead of time so that jump can be removed from a flat with no gain correction
gain_preserve = {}
if flat_gaincorrect:
tmp_gains = {}
avg_gain = 0.0
for amp in decaminfo.amps:
tmp_gains[amp] = self.sci['GAIN' + amp]
avg_gain = avg_gain + tmp_gains[amp]
for amp in decaminfo.amps:
gain_preserve[amp] = 2.0 * tmp_gains[amp] / avg_gain
# print avg_gain
# print gain_preserve
if self.do_step('gain'):
self._check_return(gain_correct(self.sci))
# B/F correction
if self.do_step('bf'):
bf_fname = self.config.get('pixcorrect_cp', 'bf')
self._check_return(
bf_correct(self.sci, bf_fname, bfinfo.DEFAULT_BFMASK))
# If done with the BPM; let python reclaim the memory
if not self.do_step('fixcol'):
self.clean_im('bpm')
# Flat field
if self.do_step('flat'):
# allow_mismatch = self.config.get('pixcorrect_cp','flat_gaincorrect')
print("flat_gaincorrect: ", flat_gaincorrect)
# for amp in decaminfo.amps:
# self.flat[gain_preserve[amp]['sec']]*=gain_preserve[amp]['cor']
self._check_return(
flat_correct_cp(self.sci, self.flat, gain_preserve))
if not self.do_step('sky'):
self.clean_im('flat')
# Fix columns
if self.do_step('fixcols'):
self._check_return(fix_columns(self.sci, self.bpm))
self.clean_im('bpm')
# Make mini-sky image
if self.do_step('mini'):
mini = self.config.get('pixcorrect_cp', 'mini')
blocksize = self.config.getint('pixcorrect_cp', 'blocksize')
self._check_return(
sky_compress(self.sci, mini, blocksize,
skyinfo.DEFAULT_SKYMASK))
# Subtract sky and make weight plane - forcing option to do "sky-only" weight
if self.do_step('sky'):
sky_fname = self.config.get('pixcorrect_cp', 'sky')
fit_fname = self.config.get('pixcorrect_cp', 'skyfit')
self._check_return(
sky_subtract(self.sci, fit_fname, sky_fname, 'sky', self.flat))
if not self.do_step('addweight'):
self.clean_im('flat')
# Star flatten
if self.do_step('starflat'):
self._check_return(starflat_correct(self.sci, self.starflat))
self.clean_im('starflat')
### Do add_weight before null_weight step, else it will overwrite the nulls
if self.do_step('addweight'):
self._check_return(add_weight(self.sci, self.flat))
self.clean_im('flat')
# This new call should take care of both --resaturate and --null_mask
if self.do_step('null_mask') or self.do_step('resaturate'):
# We need to fix the step_name if we want to call 'step_run'
null_weights.__class__.step_name = self.config_section
logger.info("Running null_weights")
self._check_return(null_weights.step_run(self.sci, self.config))
out_fname = self.config.get('pixcorrect_cp', 'out')
self.sci.save(out_fname)
return 0
def __call__(cls,
streak_list,
image_list,
streak_name_in,
streak_name_out,
image_name_in,
image_name_out,
add_width,
max_extrapolate,
plotfile=None):
"""
Read input list of streak detections and predict where a streak
crossed a CCD but was missed. Then create new copies of images,
altering masks to set STREAK bit in new streaks.
:Parameters:
- `streak_list`: list of input streak file names
- `image_list`: list of names of image files to be updated
- `streak_name_in`: string to replace in input streak filenames
- `streak_name_out`: replacement string for output streak filenames
- `image_name_in`: string to replace in input image filenames
- `image_name_out`: replacement string for output image filenames
- `add_width`: number of pixels to grow (or shrink) streak width
- `max_extrapolate`: farthest to start a new streak from endpoint of an existing one (degrees)
- `plotfile`: if given, a diagram of streaks is drawn into this file
"""
logger.info('Reading {:d} streak files'.format(len(streak_list)))
# Read in all the streak RA/Dec, into a dictionary keyed by CCDNUM,
# which should be in the primary header. Also save a dictionary of
# the file names for these
streak_corners = {}
streak_names = {}
for streakfile in streak_list:
logger.info(f"Reading streak file {streakfile}")
with fitsio.FITS(streakfile, 'r') as fits:
ccdnum = fits[0].read_header()['CCDNUM']
streak_names[ccdnum] = streakfile
tab = fits[1].read()
if len(tab) > 0:
streak_corners[ccdnum] = fits[1].read()['CORNERS_WCS']
logger.info('Reading WCS from {:d} CCDs'.format(len(image_list)))
# Read in the WCS for each CCD for which we have an image,
# also put into dicts keyed by CCDNUM
# Will get these directly from FITS instead of using DESImage in order
# to save reading all of the data.
wcs = {}
crval1 = []
crval2 = []
for imgfile in image_list:
try:
hdr = fitsio.read_header(imgfile, 0)
ccd = hdr['CCDNUM']
crval1.append(hdr['CRVAL1'])
crval2.append(hdr['CRVAL2'])
# Due to a bug in fitsio 1.0.0rc1+0, we need to clean up the
# header before feeding it to wcsutil and remove the 'None' and other problematic items
for k in hdr:
# Try to access the item, if failed we have to remove it
if not k:
hdr.delete(k)
continue
try:
_ = hdr[k]
except:
logger.info(
"Removing keyword: {:s} from header".format(k))
hdr.delete(k)
wcs[ccd] = wcsutil.WCS(hdr)
except Exception as e:
print(e) ###
logger.error('Failure reading WCS from {:s}'.format(imgfile))
return 1
# Determine a center for local gnomonic projection
ra0 = np.median(crval1)
dec0 = np.median(crval2)
# Calculate upper and lower bounds of each CCD in the local
# gnomonic system.
ccd_x1 = np.zeros(63, dtype=float)
ccd_x2 = np.zeros(63, dtype=float)
ccd_y1 = np.zeros(63, dtype=float)
ccd_y2 = np.zeros(63, dtype=float)
ccd_xmin = 1.
ccd_xmax = 2048.
ccd_ymin = 1.
ccd_ymax = 4096.
ccd_corners_xpix = np.array([ccd_xmin, ccd_xmin, ccd_xmax, ccd_xmax])
ccd_corners_ypix = np.array([ccd_ymin, ccd_ymax, ccd_ymax, ccd_ymin])
for ccd, w in wcs.items():
ra, dec = w.image2sky(ccd_corners_xpix, ccd_corners_ypix)
x_corners, y_corners = gnomonic(ra, dec, ra0, dec0)
ccd_x1[ccd] = np.min(x_corners)
ccd_y1[ccd] = np.min(y_corners)
ccd_x2[ccd] = np.max(x_corners)
ccd_y2[ccd] = np.max(y_corners)
# Now collect information on all of the streak segments that we have
ccdnum = []
ra_corner = []
dec_corner = []
for ccd, streaks in streak_corners.items():
if ccd not in wcs:
# Skip segments on CCDs that have no WCS
logger.warning(
'No WCS found for streaks on CCD {:d}'.format(ccd))
continue
n1, _, _ = streaks.shape
for i in range(n1):
ccdnum.append(ccd)
ra_corner.append(streaks[i, :, 0])
dec_corner.append(streaks[i, :, 1])
# Put streak corners into gnomonic system for this exposure
x1, y1 = gnomonic(np.array([r[0] for r in ra_corner], dtype=float),
np.array([d[0] for d in dec_corner], dtype=float),
ra0, dec0)
x2, y2 = gnomonic(np.array([r[1] for r in ra_corner], dtype=float),
np.array([d[1] for d in dec_corner], dtype=float),
ra0, dec0)
x3, y3 = gnomonic(np.array([r[2] for r in ra_corner], dtype=float),
np.array([d[2] for d in dec_corner], dtype=float),
ra0, dec0)
x4, y4 = gnomonic(np.array([r[3] for r in ra_corner], dtype=float),
np.array([d[3] for d in dec_corner], dtype=float),
ra0, dec0)
ccdnum = np.array(ccdnum, dtype=int)
# Describe each segmet by two endpoints at the midpoints of short sides
# Will need to decide which is the short side
d12 = np.hypot(x2 - x1, y2 - y1)
d23 = np.hypot(x3 - x2, y3 - y2)
xleft = np.where(d12 < d23, 0.5 * (x1 + x2), 0.5 * (x2 + x3))
yleft = np.where(d12 < d23, 0.5 * (y1 + y2), 0.5 * (y2 + y3))
xright = np.where(d12 < d23, 0.5 * (x3 + x4), 0.5 * (x4 + x1))
yright = np.where(d12 < d23, 0.5 * (y3 + y4), 0.5 * (y4 + y1))
dx = xright - xleft
dy = yright - yleft
# Calculate a width as 2x the
# largest perp distance from a vertex to this line
w1 = np.abs(dx * (y1 - yleft) - dy * (x1 - xleft)) / np.hypot(dx, dy)
w2 = np.abs(dx * (y2 - yleft) - dy * (x2 - xleft)) / np.hypot(dx, dy)
w3 = np.abs(dx * (y3 - yleft) - dy * (x3 - xleft)) / np.hypot(dx, dy)
w4 = np.abs(dx * (y4 - yleft) - dy * (x4 - xleft)) / np.hypot(dx, dy)
wmax = np.maximum(w1, w2)
wmax = np.maximum(wmax, w3)
wmax = np.maximum(wmax, w4)
wmax = 2 * wmax
# Rearrange so that xleft <= xright
swapit = xright < xleft
tmp = np.where(swapit, xleft, xright)
xleft = np.where(swapit, xright, xleft)
xright = np.array(tmp)
tmp = np.where(swapit, yleft, yright)
yleft = np.where(swapit, yright, yleft)
yright = np.array(tmp)
# Get the crossing points of the lines into CCDs
xc1, xc2, yc1, yc2 = boxCross(xleft, yleft, dx, dy, ccd_x1[ccdnum],
ccd_x2[ccdnum], ccd_y1[ccdnum],
ccd_y2[ccdnum])
# Get rid of segments that appear to miss their host CCDs
miss = xc2 < xc1
# Take 1st crossing point instead of left point if it has higher x, or vertical
# with higher y, i.e. truncate the track segment at the edge of the CCD.
replace = np.where(dx == 0, yc1 > yleft, xc1 > xleft)
xc1 = np.where(replace, xc1, xleft)
yc1 = np.where(replace, yc1, yleft)
# Likewise truncate segment at right-hand crossing
replace = np.where(dx == 0, yc2 < yright, xc2 < xright)
xc2 = np.where(replace, xc2, xright)
yc2 = np.where(replace, yc2, yright)
# Backfill the non-intersections again - note that above
# maneuvers will leave xc2<xc1 for streaks that miss their CCDs,
# unless vertical ???
xc1[miss] = 0.
xc2[miss] = -1.
# Get a final verdict on hit or miss
miss = np.where(dx == 0, yc2 < yc1, xc2 < xc1)
# Save information on all valid streaks
xc1 = xc1[~miss]
xc2 = xc2[~miss]
yc1 = yc1[~miss]
yc2 = yc2[~miss]
wmax = wmax[~miss]
ccdnum = ccdnum[~miss]
# Express segments as slopes and midpoints
dx = xc2 - xc1
dy = yc2 - yc1
mx = dx / np.hypot(dx, dy)
my = dy / np.hypot(dx, dy)
# Mark segments that are probably spurious edge detections
EDGE_SLOPE = 2. # Degrees from horizontal for edge streaks
EDGE_DISTANCE = 0.005 # Max degrees from streak center to CCD edge for spurious streaks
horizontal = np.abs(my) < np.sin(EDGE_SLOPE * np.pi / 180.)
ymid = 0.5 * (yc1 + yc2)
nearedge = np.logical_or(ccd_y2[ccdnum] - ymid < EDGE_DISTANCE,
ymid - ccd_y1[ccdnum] < EDGE_DISTANCE)
nearedge = np.logical_and(nearedge, horizontal)
# Check short edges too
vertical = np.abs(mx) < np.sin(EDGE_SLOPE * np.pi / 180.)
xmid = 0.5 * (xc1 + xc2)
tmp = np.logical_or(ccd_x2[ccdnum] - xmid < EDGE_DISTANCE,
xmid - ccd_x1[ccdnum] < EDGE_DISTANCE)
nearedge = np.logical_or(nearedge, np.logical_and(tmp, vertical))
# Decide which segments are "friends" of each other.
# To be a friend, the center of each must be close
# to the extension of the line of the other.
# Accumulate a list of tracks, each track is a list of
# individual streaks that are friends of friends
tracks = []
for i in range(len(xc1)):
if nearedge[i]:
continue # Do not use edge tracks
itstrack = [i] # start new track with just this
for t in tracks:
# Search other tracks for friends
for j in t:
if friends(xc1, xc2, yc1, yc2, mx, my, ccdnum, i, j):
itstrack += t # Merge track
tracks.remove(t) # Get rid of old one
break # No need to check others
tracks.append(itstrack)
# Now iterate through tracks, seeing if they have missing segments
# Create arrays to hold information on new tracks
new_ccdnum = []
new_xc1 = []
new_xc2 = []
new_yc1 = []
new_yc2 = []
new_ra1 = []
new_ra2 = []
new_dec1 = []
new_dec2 = []
new_width = []
new_extrapolated = []
new_nearest = []
for t in tracks:
if len(t) < 2:
continue # Do not extrapolate singlet tracks
ids = np.array(
t) # Make an array of indices of segments in this track
# Fit a quadratic path to the streak endpoints
xx = np.concatenate((xc1[ids], xc2[ids]))
yy = np.concatenate((yc1[ids], yc2[ids]))
# If the track slope is mostly along x, then we'll have the independent
# variable xx be x and dependent yy will be y. But if track
# is more vertical, then we'll look at functions x(y) instead.
xOrder = np.median(np.abs(mx[ids])) > np.median(np.abs(my[ids]))
if not xOrder:
xx, yy = yy, xx
# Record limits of detected tracks' independent variable
xxmin = np.min(xx)
xxmax = np.max(xx)
# Fit a quadratic to the points, or
# linear if only one streak
# Allow up to nclip points to clip
RESID_TOLERANCE = 6. / 3600. # Clip >6" deviants
nclip = 2
for i in range(nclip + 1):
if len(xx) > 2:
A = np.vstack((np.ones_like(xx), xx, xx * xx))
else:
A = np.vstack((np.ones_like(xx), xx))
coeffs = np.linalg.lstsq(A.T, yy, rcond=None)[0]
resid = yy - np.dot(A.T, coeffs)
j = np.argmax(np.abs(resid))
if i == nclip or np.abs(resid[j]) < RESID_TOLERANCE:
break
xx = np.delete(xx, j)
yy = np.delete(yy, j)
# Calculate the y(x1),y(x2) where tracks
# cross the left/right of every CCD, then
# find the ones that will cross CCD's y.
# These are CCD bounds, with xx being the quadratic's argument
if xOrder:
xx1 = ccd_x1
xx2 = ccd_x2
yy1 = ccd_y1
yy2 = ccd_y2
else:
xx1 = ccd_y1
xx2 = ccd_y2
yy1 = ccd_x1
yy2 = ccd_x2
if len(coeffs) == 2:
A2 = np.vstack((np.ones_like(xx2), xx2)).T
A1 = np.vstack((np.ones_like(xx1), xx1)).T
else:
A2 = np.vstack((np.ones_like(xx2), xx2, xx2 * xx2)).T
A1 = np.vstack((np.ones_like(xx1), xx1, xx1 * xx1)).T
# yyc[12] are the dependent coordinate at crossings of xx[12] bounds
yyc1 = np.dot(A1, coeffs)
yyc2 = np.dot(A2, coeffs)
# Now we ask whether the y value of streak at either edge crossing
# is in the y range of a CCD
missed = np.logical_or(
np.maximum(yyc1, yyc2) < yy1,
np.minimum(yyc1, yyc2) > yy2)
# Also skip any CCD where we already have a streak
for iccd in ccdnum[ids]:
missed[iccd] = True
missed[0] = True # There is no CCD0
missed[61] = True # Never use this one either, it's always dead
# Now find intersection of new streaks with edges of their CCDs
# Define a function for the streak path that we'll use for solving
def poly(x, coeffs, ysolve):
y = coeffs[0] + x * coeffs[1]
if len(coeffs) > 2:
y += coeffs[2] * x * x
return y - ysolve
EDGE_TOLERANCE = 0.2 / 3600. # Find x/y of edge to this accuracy (0.2 arcsec)
for iccd in np.where(~missed)[0]:
# This is a loop over every CCD that the track crosses but has no detected segment
# Determine an (xx,yy) pair for its entry and exit from the CCD
new_yy1 = yyc1[iccd]
new_yy2 = yyc2[iccd]
new_xx1 = xx1[iccd]
new_xx2 = xx2[iccd]
# left side:
if new_yy1 < yy1[iccd]:
new_xx1 = newton(poly,
new_xx1,
args=(coeffs, yy1[iccd]),
tol=EDGE_TOLERANCE)
elif new_yy1 > yy2[iccd]:
new_xx1 = newton(poly,
new_xx1,
args=(coeffs, yy2[iccd]),
tol=EDGE_TOLERANCE)
new_yy1 = poly(new_xx1, coeffs, 0.)
# right side
if new_yy2 < yy1[iccd]:
new_xx2 = newton(poly,
new_xx2,
args=(coeffs, yy1[iccd]),
tol=EDGE_TOLERANCE)
elif new_yy2 > yy2[iccd]:
new_xx2 = newton(poly,
new_xx2,
args=(coeffs, yy2[iccd]),
tol=EDGE_TOLERANCE)
new_yy2 = poly(new_xx2, coeffs, 0.)
# Does the solution lie outside the input streaks?
extrapolated = new_xx1 < xxmin or new_xx2 > xxmax
width = np.median(wmax[ids])
# Calculate distance to nearest unclipped streak member
nearest = min(np.min(np.hypot(xx - new_xx1, yy - new_yy1)),
np.min(np.hypot(xx - new_xx2, yy - new_yy2)))
if not xOrder:
# swap xx,yy back if we had y as the independent variable
new_xx1, new_yy1 = new_yy1, new_xx1
new_xx2, new_yy2 = new_yy2, new_xx2
# Project the coordinates back to RA, Dec
ra1, dec1 = gnomonicInverse(new_xx1, new_yy1, ra0, dec0)
ra2, dec2 = gnomonicInverse(new_xx2, new_yy2, ra0, dec0)
# Append this streak to list of new ones
new_ccdnum.append(iccd)
new_xc1.append(new_xx1)
new_xc2.append(new_xx2)
new_yc1.append(new_yy1)
new_yc2.append(new_yy2)
new_ra1.append(ra1)
new_ra2.append(ra2)
new_dec1.append(dec1)
new_dec2.append(dec2)
new_width.append(width)
new_extrapolated.append(extrapolated)
new_nearest.append(nearest)
# Make all lists into arrays
new_ccdnum = np.array(new_ccdnum, dtype=int)
new_xc1 = np.array(new_xc1, dtype=float)
new_xc2 = np.array(new_xc2, dtype=float)
new_yc1 = np.array(new_yc1, dtype=float)
new_yc2 = np.array(new_yc2, dtype=float)
new_ra1 = np.array(new_ra1, dtype=float)
new_ra2 = np.array(new_ra2, dtype=float)
new_dec1 = np.array(new_dec1, dtype=float)
new_dec2 = np.array(new_dec2, dtype=float)
new_width = np.array(new_width, dtype=float)
new_extrapolated = np.array(new_extrapolated, dtype=bool)
new_nearest = np.array(new_nearest, dtype=float)
# Decide which new segments will be masked
maskit = np.logical_or(~new_extrapolated,
new_nearest <= max_extrapolate)
logger.info('Identified {:d} missing streak segments for masking'.format(\
np.count_nonzero(maskit)))
# Make the diagnostic plot if desired
if plotfile is not None:
pl.figure(figsize=(6, 6))
pl.xlim(-1.1, 1.1)
pl.ylim(-1.1, 1.1)
pl.gca().set_aspect('equal')
# Draw CCD outlines and numbers
for ccd, w in wcs.items():
ra, dec = w.image2sky(ccd_corners_xpix, ccd_corners_ypix)
x_corners, y_corners = gnomonic(ra, dec, ra0, dec0)
x = x_corners.tolist()
y = y_corners.tolist()
x.append(x[0])
y.append(y[0])
pl.plot(x, y, 'k-', label=None)
x = np.mean(x_corners)
y = np.mean(y_corners)
pl.text(x,
y,
str(ccd),
horizontalalignment='center',
verticalalignment='center',
fontsize=14)
# Draw input streaks marked as edge
labelled = False
for i in np.where(nearedge)[0]:
x = (xc1[i], xc2[i])
y = (yc1[i], yc2[i])
if not labelled:
pl.plot(x, y, 'm-', lw=2, label='edge')
labelled = True
else:
pl.plot(x, y, 'm-', lw=2, label=None)
# Draw linked tracks
s = set()
for t in tracks:
if len(t) > 1:
s = s.union(set(t))
labelled = False
for i in s:
x = (xc1[i], xc2[i])
y = (yc1[i], yc2[i])
if not labelled:
pl.plot(x, y, 'b-', lw=2, label='connected')
labelled = True
else:
pl.plot(x, y, 'b-', lw=2, label=None)
# Draw singleton tracks as those that are neither edge nor connected
s = s.union(set(np.where(nearedge)[0]))
single = set(range(len(xc1)))
single = single.difference(s)
labelled = False
for i in single:
x = (xc1[i], xc2[i])
y = (yc1[i], yc2[i])
if not labelled:
pl.plot(x, y, 'c-', lw=2, label='unconnected')
labelled = True
else:
pl.plot(x, y, 'c-', lw=2, label=None)
# Draw missed tracks that will be masked
labelled = False
for i in np.where(maskit)[0]:
x = (new_xc1[i], new_xc2[i])
y = (new_yc1[i], new_yc2[i])
if not labelled:
pl.plot(x, y, 'r-', lw=2, label='new masked')
labelled = True
else:
pl.plot(x, y, 'r-', lw=2, label=None)
# Draw missed tracks that will not be masked
labelled = False
for i in np.where(~maskit)[0]:
x = (new_xc1[i], new_xc2[i])
y = (new_yc1[i], new_yc2[i])
if not labelled:
pl.plot(x, y, 'r:', lw=2, label='new skipped')
labelled = True
else:
pl.plot(x, y, 'r:', lw=2, label=None)
# legend
pl.legend(framealpha=0.3, fontsize='small')
pl.savefig(plotfile)
# Now accumulate pixel coordinates of corners of all new streaks to mask
added_streak_ccds = []
added_streak_corners = []
for id, ccd in enumerate(new_ccdnum):
ccd = new_ccdnum[id]
if not maskit[id]:
continue # Only proceed with the ones to be masked
# Get a pixel scale from the WCS, in arcsec/pix
xmid = np.mean(ccd_corners_xpix)
ymid = np.mean(ccd_corners_ypix)
ra, dec = wcs[ccd].image2sky(xmid, ymid)
ra2, dec2 = wcs[ccd].image2sky(xmid + 1, ymid)
pixscale = np.hypot(
np.cos(dec * np.pi / 180.) * (ra - ra2), dec - dec2)
# width of streak, in pixels
w = new_width[id] / pixscale + add_width
if w <= 0.:
continue # Don't mask streaks of zero width
# Make RA/Dec of track endpoints
x = np.array([new_xc1[id], new_xc2[id]])
y = np.array([new_yc1[id], new_yc2[id]])
ra, dec = gnomonicInverse(x, y, ra0, dec0)
# Convert to pixel coordinates
x, y = wcs[ccd].sky2image(ra, dec)
line = Line(x[0], y[0], x[1], y[1])
# Create bounding rectangle of track
corners_pix = boxTrack(line, w, ccd_xmin, ccd_xmax, ccd_ymin,
ccd_ymax)
added_streak_ccds.append(ccd)
added_streak_corners.append(np.array(corners_pix))
added_streak_ccds = np.array(added_streak_ccds)
# Make new copies of streak files, adding new ones
logger.debug('Rewriting streak files')
for ccd, streakfile_in in streak_names.items():
nmatch = len(re.findall(streak_name_in, streakfile_in))
if nmatch != 1:
logger.error('Could not update streak file named <' +
streakfile_in + '>')
return 1
streakfile_out = re.sub(streak_name_in, streak_name_out,
streakfile_in)
# Use file system to make fresh copy of table's FITS file
shutil.copy2(streakfile_in, streakfile_out)
# Find new streaks for this ccd
add_ids = np.where(added_streak_ccds == ccd)[0]
if len(add_ids) > 0:
# Open the table and add new streaks' info
try:
fits = fitsio.FITS(streakfile_out, 'rw')
addit = np.recarray(len(add_ids),
dtype=[('LABEL', '>i4'),
('CORNERS', '>f4', (4, 2)),
('CORNERS_WCS', '>f8', (4, 2))])
if fits[1]['LABEL'][:]:
first_label = np.max(fits[1]['LABEL'][:]) + 1
else:
first_label = 1
addit.LABEL = np.arange(first_label,
first_label + len(addit))
for i, id in enumerate(add_ids):
corners_pix = added_streak_corners[id]
addit.CORNERS[i] = corners_pix
ra, dec = wcs[ccd].image2sky(corners_pix[:, 0],
corners_pix[:, 1])
addit.CORNERS_WCS[i] = np.vstack((ra, dec)).T
fits[1].append(addit)
fits.close()
except Exception as e:
print(e)
logger.error('Failure updating streak file <{:s}>'.format(
streakfile_out))
return 1
logger.debug('Remasking images')
for imgfile_in in image_list:
# Make the name needed for output
nmatch = len(re.findall(image_name_in, imgfile_in))
if nmatch != 1:
logger.error(
'Could not create output name for image file named <' +
imgfile_in + '>')
return 1
imgfile_out = re.sub(image_name_in, image_name_out, imgfile_in)
logger.info(f"Loading image: {imgfile_in}")
sci = DESImage.load(imgfile_in)
ccd = sci.header['CCDNUM']
# Find added streaks for this ccd
add_ids = np.where(added_streak_ccds == ccd)[0]
if len(add_ids) > 0:
shape = sci.mask.shape
yy, xx = np.indices(shape)
points = np.vstack((xx.flatten(), yy.flatten())).T
inside = None
for id in add_ids:
# From Alex's immask routine: mark interior pixels
# for each added streak
v = added_streak_corners[id]
vertices = [(v[0, 0], v[0, 1]), (v[1, 0], v[1, 1]),
(v[2, 0], v[2, 1]), (v[3, 0], v[3, 1]),
(v[0, 0], v[0, 1])]
path = matplotlib.path.Path(vertices)
if inside is None:
inside = path.contains_points(points)
else:
inside = np.logical_or(inside,
path.contains_points(points))
# Make the list of masked pixels
if inside is None:
ymask, xmask = np.array(0, dtype=int), np.array(0,
dtype=int)
else:
ymask, xmask = np.nonzero(inside.reshape(shape))
sci.mask[ymask, xmask] |= parse_badpix_mask('STREAK')
# Write something into the image header
sci['DESCNCTS'] = time.asctime(time.localtime()) + \
' Mask {:d} new streaks'.format(len(add_ids))
# sci['HISTORY'] = time.asctime(time.localtime()) + \
# ' Mask {:d} new streaks'.format(len(add_ids))
logger.info(f"Saving to: {imgfile_out}")
sci.save(imgfile_out)
logger.info('Finished connecting streaks')
ret_code = 0
return ret_code
def __call__(self):
"""Do image-by-image pixel level corrections
"""
# All the code here, asside from one call for each step, should
# be assiciated with shoveling data between steps. Everything else should
# take inside the code for its respective step.
# Get the science image
self.sci = DESImage.load(self.config.get('pixcorrect_im', 'in'))
# Bias subtraction
if self.do_step('bias'):
self._check_return(bias_correct(self.sci, self.bias))
self.clean_im('bias')
# Linearization
if self.do_step('lincor'):
lincor_fname = self.config.get('pixcorrect_im', 'lincor')
self._check_return(linearity_correct(self.sci, lincor_fname))
# Make the mask plane and mark saturated pixels. Note that flags
# are set to mark saturated pixels and keep any previously existing mask bits.
if self.do_step('bpm'):
self._check_return(
make_mask(self.sci, self.bpm, saturate=True, clear=False))
if self.do_step('gain'):
self._check_return(gain_correct(self.sci))
# If done with the BPM; let python reclaim the memory
if not self.do_step('fixcols'):
self.clean_im('bpm')
# Fix columns
if self.do_step('fixcols'):
self._check_return(fix_columns(self.sci, self.bpm))
self.clean_im('bpm')
# B/F correction
if self.do_step('bf'):
bf_fname = self.config.get('pixcorrect_im', 'bf')
self._check_return(
bf_correct(self.sci, bf_fname, bfinfo.DEFAULT_BFMASK))
# Flat field
if self.do_step('flat'):
self._check_return(flat_correct(self.sci, self.flat))
if not self.do_step('sky'):
self.clean_im('flat')
# LightBulb
if self.do_step('lightbulb'):
self._check_return(lightbulb(self.sci))
# CTI Check
if self.do_step('cticheck'):
self._check_return(cticheck(self.sci))
# Make mini-sky image
if self.do_step('mini'):
mini = self.config.get('pixcorrect_im', 'mini')
blocksize = self.config.getint('pixcorrect_im', 'blocksize')
self._check_return(
sky_compress(self.sci, mini, blocksize,
skyinfo.DEFAULT_SKYMASK))
# Subtract sky and make weight plane - forcing option to do "sky-only" weight
if self.do_step('sky'):
sky_fname = self.config.get('pixcorrect_im', 'sky')
fit_fname = self.config.get('pixcorrect_im', 'skyfit')
self._check_return(
sky_subtract(self.sci, fit_fname, sky_fname, 'sky', self.flat))
if not self.do_step('addweight'):
self.clean_im('flat')
# Star flatten
if self.do_step('starflat'):
self._check_return(starflat_correct(self.sci, self.starflat))
self.clean_im('starflat')
### Do add_weight before null_weight step, else it will overwrite the nulls
if self.do_step('addweight'):
self._check_return(add_weight(self.sci, self.flat))
self.clean_im('flat')
# This new call should take care of both --resaturate and --null_mask
if self.do_step('null_mask') or self.do_step('resaturate'):
# We need to fix the step_name if we want to call 'step_run'
null_weights.__class__.step_name = self.config_section
logger.info("Running null_weights")
self._check_return(null_weights.step_run(self.sci, self.config))
out_fname = self.config.get('pixcorrect_im', 'out')
self.sci.save(out_fname)
return 0
def __call__(cls, inlist, ccdnorm, ampborder):
"""Apply a flat field correction to an image
:Parameters:
- `inlist`: list of input and output flat DESImage(s) to normalize
- `flat_im`: the flat correction image to apply
Applies the correction to each input and writes a separate output file.
"""
logger.info('Initial Read of Flat Field Headers')
#
norm_list = []
scalmean_list = []
normval = None
#
try:
f1 = open(inlist, 'r')
for line in f1:
line = line.strip()
columns = line.split()
if os.path.isfile(columns[0]):
tmp_dict = {}
tmp_dict['fname'] = columns[0]
tmp_dict['oname'] = columns[1]
if tmp_dict['fname'][-2:] == "fz":
sci_hdu = 1 # for .fz
else:
sci_hdu = 0 # for .fits (or .gz)
temp_fits = fitsio.FITS(tmp_dict['fname'], 'r')
temp_head = temp_fits[sci_hdu].read_header()
#
# Get the CCD number
#
try:
tmp_dict['ccdnum'] = int(temp_head['CCDNUM'])
except:
if ccdnorm < 1:
tmp_dict['ccdnum'] = -1
else:
print(
"Warning: image {:s} did not have a CCDNUM keyword!"
.format(tmp_dict['fname']))
#
# Get the SCALMEAN value
#
try:
tmp_dict['scalmean'] = float(temp_head['SCALMEAN'])
except:
raise ValueError(
"Image %s did not have a SCALMEAN keyword. Aborting!"
% tmp_dict['fname'])
#
# Finished first header census
# Save file info and scalmean's to a list
#
norm_list.append(tmp_dict)
scalmean_list.append(tmp_dict['scalmean'])
temp_fits.close()
f1.close()
except:
#
# Input file was not present.
#
# (type, value, trback)=sys.exc_info()
# print("{:s} {:s} {:s} \n".format(inlist,type,value))
raise IOError("File not found. Missing input list %s " % inlist)
#
# All information is now present. Determine the value that will be used in normalization.
#
if ccdnorm > 1:
for tmp_rec in norm_list:
if normval is None:
if tmp_rec['ccdnum'] == ccdnorm:
normval = tmp_rec['ccdnum']
else:
if tmp_rec['ccdnum'] == ccdnorm:
print(
"Warning: More than one image with CCDNUM={:d} identified"
)
if normval is None:
raise ValueError(
"No image with CCDNUM=%d found among input list. Aborting!"
% ccdnorm)
logger.info('Normaliztion: %.2f set based on value from CCD %d ',
normval, ccdnorm)
else:
a_scalmean = np.array(scalmean_list)
normval = np.median(a_scalmean)
logger.info(
'Normaliztion: %.2f set based on median value of the ensemble ',
normval)
#
# Go ahead and normalize the set
#
logger.info('Normalizing list')
for tmp_record in norm_list:
logger.info('Working on image: %s ', tmp_record['fname'])
image = DESImage.load(tmp_record['fname'])
nfactor = tmp_record['scalmean'] / normval
nfactor2 = nfactor * nfactor
logger.info(' CCD: %2d, relative normalization factor: %.5f ',
tmp_record['ccdnum'], nfactor)
image.data *= nfactor
image.weight *= nfactor2
#
# Create keywords that reflect the median value of the flat on each amp.
#
for amp in decaminfo.amps:
datasecn = scan_fits_section(image, 'DATASEC' + amp)
datasecn[0] += ampborder
datasecn[1] -= ampborder
datasecn[2] += ampborder
datasecn[3] -= ampborder
image['FLATMED' + amp] = np.median(
image.data[datasecn[2]:datasecn[3] + 1,
datasecn[0]:datasecn[1] + 1])
DESImage.save(image, tmp_record['oname'])
logger.debug('Finished applying Flat')
ret_code = 0
return ret_code