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Add reference for scharr operator

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Johannes Schönberger
2012-10-13 09:17:34 +02:00
parent 04f21c5841
commit 1fbd664d5b
1 changed files with 15 additions and 0 deletions
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skimage/filter/edges.py
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@@ -156,6 +156,11 @@ def scharr(image, mask=None):
vertical Scharrs to get a magnitude that's somewhat insensitive to vertical Scharrs to get a magnitude that's somewhat insensitive to
direction. direction.
References
----------
.. [1] D. Kroon, 2009, Short Paper University Twente, Numerical Optimization
of Kernel Based Image Derivatives.
""" """
return np.sqrt(hscharr(image, mask)**2 + vscharr(image, mask)**2) return np.sqrt(hscharr(image, mask)**2 + vscharr(image, mask)**2)
@@ -186,6 +191,11 @@ def hscharr(image, mask=None):
0 0 0 0 0 0
-3 -10 -3 -3 -10 -3
References
----------
.. [1] D. Kroon, 2009, Short Paper University Twente, Numerical Optimization
of Kernel Based Image Derivatives.
""" """
image = img_as_float(image) image = img_as_float(image)
result = np.abs(convolve(image, result = np.abs(convolve(image,
@@ -221,6 +231,11 @@ def vscharr(image, mask=None):
10 0 -10 10 0 -10
3 0 -3 3 0 -3
References
----------
.. [1] D. Kroon, 2009, Short Paper University Twente, Numerical Optimization
of Kernel Based Image Derivatives.
""" """
image = img_as_float(image) image = img_as_float(image)
result = np.abs(convolve(image, result = np.abs(convolve(image,