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b/ants/utils/channels.py |
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__all__ = ['merge_channels', |
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'split_channels'] |
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import ants |
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from ants.internal import get_lib_fn |
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from ants.decorators import image_method |
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def merge_channels(image_list, channels_first=False): |
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""" |
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Merge channels of multiple scalar ANTsImage types into one |
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multi-channel ANTsImage |
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ANTsR function: `mergeChannels` |
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Arguments |
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--------- |
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image_list : list/tuple of ANTsImage types |
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scalar images to merge |
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Returns |
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------- |
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ANTsImage |
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Example |
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------- |
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>>> import ants |
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>>> image = ants.image_read(ants.get_ants_data('r16')) |
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>>> image2 = ants.image_read(ants.get_ants_data('r16')) |
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>>> image3 = ants.merge_channels([image,image2]) |
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>>> image3 = ants.merge_channels([image,image2], channels_first=True) |
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>>> image3.numpy() |
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>>> image3.components == 2 |
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""" |
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inpixeltype = image_list[0].pixeltype |
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dimension = image_list[0].dimension |
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components = len(image_list) |
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for image in image_list: |
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if not ants.is_image(image): |
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raise ValueError('list may only contain ANTsImage objects') |
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if image.pixeltype != inpixeltype: |
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raise ValueError('all images must have the same pixeltype') |
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libfn = get_lib_fn('mergeChannels') |
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image_ptr = libfn([image.pointer for image in image_list]) |
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image = ants.from_pointer(image_ptr) |
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image.channels_first = channels_first |
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return image |
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@image_method |
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def split_channels(image): |
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""" |
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Split channels of a multi-channel ANTsImage into a collection |
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of scalar ANTsImage types |
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Arguments |
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--------- |
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image : ANTsImage |
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multi-channel image to split |
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Returns |
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------- |
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list of ANTsImage types |
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Example |
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------- |
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>>> import ants |
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>>> image = ants.image_read(ants.get_ants_data('r16'), 'float') |
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>>> image2 = ants.image_read(ants.get_ants_data('r16'), 'float') |
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>>> imagemerge = ants.merge_channels([image,image2]) |
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>>> imagemerge.components == 2 |
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>>> images_unmerged = ants.split_channels(imagemerge) |
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>>> len(images_unmerged) == 2 |
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>>> images_unmerged[0].components == 1 |
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""" |
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inpixeltype = image.pixeltype |
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dimension = image.dimension |
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components = 1 |
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libfn = get_lib_fn('splitChannels') |
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itkimages = libfn(image.pointer) |
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antsimages = [ants.from_pointer(itkimage) for itkimage in itkimages] |
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return antsimages |
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