def shift_images(files, source_dir, output_file='_shifted'):
"""Align images based on astrometry."""
ref = files[0] # TODO: make reference image an input
ref_im = ImageWithWCS(path.join(source_dir,ref))
ref_pix = np.int32(np.array(ref_im.data.shape)/2)
ref_ra_dec = ref_im.wcs_pix2sky(ref_pix)
for fil in files[1:]:
img = ImageWithWCS(path.join(source_dir,fil))
ra_dec_pix = img.wcs_sky2pix(ref_ra_dec)
shift = ref_pix - np.int32(ra_dec_pix)
print shift
img.shift(shift, in_place=True)
base, ext = path.splitext(fil)
img.save(path.join(source_dir,base+output_file+ext))
try:
ra = img.header['ra']
dec = img.header['dec']
ra_dec = (ra, dec)
except KeyError:
ra_dec = None
if ra_dec is None:
original_fname = path.join(currentDir,light_file['file'])
root, ext = path.splitext(original_fname)
f = open(root+'.blind','wb')
f.close()
continue
astrometry = ast.add_astrometry(img.fitsfile.filename(), ra_dec=ra_dec,
note_failure=True, overwrite=True)
if astrometry and ra_dec is None:
original_fname = path.join(currentDir,light_file['file'])
root, ext = path.splitext(original_fname)
#astrometry_fname = root+'.new'
#new_fname = root+'_new.fit'
# print new_fname, astrometry_fname
#rename( astrometry_fname, new_fname)
img_new = ImageWithWCS(original_fname)
ra_dec = img_new.wcs_pix2sky(np.trunc(np.array(img_new.shape)/2))
img_new.header.update('RA',ra_dec[0])
img_new.header.update('DEC',ra_dec[1])
img_new.save(img_new.fitsfile.filename(), clobber=True)