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Fix 'outer' mode of find_boundaries

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This commit is contained in:
Juan Nunez-Iglesias
2015-01-08 22:06:31 +11:00
parent ff1631c717
commit 32a960db0d
1 changed files with 7 additions and 2 deletions
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skimage/segmentation/boundaries.py
+7 -2
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@@ -108,6 +108,7 @@ def find_boundaries(label_img, connectivity=1, mode='thick', background=0):
"""
ndim = label_img.ndim
selem = nd.generate_binary_structure(ndim, connectivity)
max_label = np.iinfo(label_img.dtype).max
if mode != 'subpixel':
boundaries = dilation(label_img, selem) != erosion(label_img, selem)
if mode == 'inner':
@@ -116,8 +117,12 @@ def find_boundaries(label_img, connectivity=1, mode='thick', background=0):
elif mode == 'outer':
background_image = (label_img == background)
selem = nd.generate_binary_structure(ndim, ndim)
no_adjacent_background = ~dilation(background_image, selem)
boundaries &= (background_image | no_adjacent_background)
inverted_background = np.array(label_img, copy=True)
inverted_background[background_image] = max_label
adjacent_objects = ((dilation(label_img, selem) !=
erosion(inverted_background, selem)) &
~background_image)
boundaries &= (background_image | adjacent_objects)
return boundaries
else:
label_img_expanded = np.zeros([(2 * s - 1) for s in label_img.shape],