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Some improvements for perimeter

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Johannes Schönberger
2013-10-02 13:55:52 +02:00
parent c414e96fcc
commit 99fb8b992e
1 changed files with 6 additions and 6 deletions
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skimage/measure/_regionprops.py
+6 -6
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@@ -13,8 +13,8 @@ __all__ = ['regionprops']
STREL_4 = np.array([[0, 1, 0],
[1, 1, 1],
[0, 1, 0]])
STREL_8 = np.ones((3, 3), 'int8')
[0, 1, 0]], dtype=np.uint8)
STREL_8 = np.ones((3, 3), dtype=np.uint8)
PROPS = {
'Area': 'area',
'BoundingBox': 'bbox',
@@ -498,14 +498,14 @@ def perimeter(image, neighbourhood=4):
Parameters
----------
image : array
binary image
Binary image.
neighbourhood : 4 or 8, optional
neighbourhood connectivity for border pixel determination, default 4
Neighborhood connectivity for border pixel determination.
Returns
-------
perimeter : float
total perimeter of all objects in binary image
Total perimeter of all objects in binary image.
References
----------
@@ -521,7 +521,7 @@ def perimeter(image, neighbourhood=4):
eroded_image = ndimage.binary_erosion(image, strel, border_value=0)
border_image = image - eroded_image
perimeter_weights = np.zeros(50, float)
perimeter_weights = np.zeros(50, dtype=np.float32)
perimeter_weights[[5, 7, 15, 17, 25, 27]] = 1
perimeter_weights[[21, 33]] = sqrt(2)
perimeter_weights[[13, 23]] = (1 + sqrt(2)) / 2