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ENH: support resampling multi-channel images #609

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merged 2 commits into from
Apr 16, 2024
Merged

ENH: support resampling multi-channel images #609

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de0af5c
support resampling multi-channel images
Apr 16, 2024
6f4fa76
fix typo
Apr 16, 2024
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19 changes: 18 additions & 1 deletion ants/registration/resample_image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,9 @@ def resample_image(image, resample_params, use_voxels=False, interp_type=1):
>>> fi = ants.image_read( ants.get_ants_data("r16"))
>>> finn = ants.resample_image(fi,(50,60),True,0)
>>> filin = ants.resample_image(fi,(1.5,1.5),False,1)
>>> img = ants.image_read( ants.get_ants_data("r16"))
>>> img = ants.merge_channels([img, img])
>>> outimg = ants.resample_image(img, (128,128), True)
"""
if image.components == 1:
inimage = image.clone('float')
Expand All @@ -53,7 +56,21 @@ def resample_image(image, resample_params, use_voxels=False, interp_type=1):
outimage = outimage.clone(image.pixeltype)
return outimage
else:
raise ValueError('images with more than 1 component not currently supported')
images = utils.split_channels(image)
new_images = []
for image in images:
inimage = image.clone('float')
outimage = image.clone('float')
rsampar = 'x'.join([str(rp) for rp in resample_params])

args = [image.dimension, inimage, outimage, rsampar, int(use_voxels), interp_type]
processed_args = utils._int_antsProcessArguments(args)
libfn = utils.get_lib_fn('ResampleImage')
libfn(processed_args)
outimage = outimage.clone(image.pixeltype)
new_images.append(outimage)
outimage = utils.merge_channels(new_images)
return outimage


def resample_image_to_target(image, target, interp_type='linear', imagetype=0, verbose=False, **kwargs):
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7 changes: 7 additions & 0 deletions tests/test_registration.py
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Original file line number Diff line number Diff line change
Expand Up @@ -295,6 +295,13 @@ def test_resample_image_example(self):
fi = ants.image_read(ants.get_ants_data("r16"))
finn = ants.resample_image(fi, (50, 60), True, 0)
filin = ants.resample_image(fi, (1.5, 1.5), False, 1)

def test_resample_channels(self):
img = ants.image_read( ants.get_ants_data("r16"))
img = ants.merge_channels([img, img])
outimg = ants.resample_image(img, (128,128), True)
self.assertEqual(outimg.shape, (128, 128))
self.assertEqual(outimg.components, 2)

def test_resample_image_to_target_example(self):
fi = ants.image_read(ants.get_ants_data("r16"))
Expand Down