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Expand explanation of _invert_selem

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Juan Nunez-Iglesias
2015-01-22 11:38:37 +11:00
parent 9eed552ee7
commit 2d0a3eff33
1 changed files with 5 additions and 3 deletions
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skimage/morphology/grey.py
+5 -3
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@@ -241,9 +241,11 @@ def dilation(image, selem=None, out=None, shift_x=False, shift_y=False):
"""
selem = np.array(selem)
selem = _shift_selem(selem, shift_x, shift_y)
# invert the structuring element to patch the same thing happening inside
# ndimage.grey_dilation
# https://github.com/scipy/scipy/blob/ec20ababa400e39ac3ffc9148c01ef86d5349332/scipy/ndimage/morphology.py#L1285
# Inside ndimage.grey_dilation, the structuring element is inverted,
# eg. `selem = selem[::-1, ::-1]` for 2D [1]_, for reasons unknown to
# this author (@jni). To "patch" this behaviour, we invert our own
# selem before passing it to `nd.grey_dilation`.
# [1] https://github.com/scipy/scipy/blob/ec20ababa400e39ac3ffc9148c01ef86d5349332/scipy/ndimage/morphology.py#L1285
selem = _invert_selem(selem)
if out is None:
out = np.empty_like(image)