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Add examples for structure tensor and hessian matrix functions

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Johannes Schönberger
2013-11-29 20:42:05 +01:00
parent aee31e91a7
commit 53a339e4f4
1 changed files with 26 additions and 0 deletions
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skimage/feature/corner.py
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@@ -69,6 +69,19 @@ def structure_tensor(image, sigma=1, mode='constant', cval=0):
Ayy : ndarray
Element of the structure tensor for each pixel in the input image.
Examples
--------
>>> from skimage.feature import structure_tensor
>>> square = np.zeros((5, 5))
>>> square[2, 2] = 1
>>> Axx, Axy, Ayy = structure_tensor(square, sigma=0.1)
>>> Axx
array([[ 0., 0., 0., 0., 0.],
[ 0., 1., 0., 1., 0.],
[ 0., 4., 0., 4., 0.],
[ 0., 1., 0., 1., 0.],
[ 0., 0., 0., 0., 0.]])
"""
image = np.squeeze(image)
@@ -118,6 +131,19 @@ def hessian_matrix(image, sigma=1, mode='constant', cval=0):
Hyy : ndarray
Element of the Hessian matrix for each pixel in the input image.
Examples
--------
>>> from skimage.feature import hessian_matrix, hessian_matrix_eigvals
>>> square = np.zeros((5, 5))
>>> square[2, 2] = 1
>>> Hxx, Hxy, Hyy = hessian_matrix(square, sigma=0.1)
>>> Hxx
array([[ 0., 0., 0., 0., 0.],
[ 0., 0., 0., 0., 0.],
[ 0., 0., 1., 0., 0.],
[ 0., 0., 0., 0., 0.],
[ 0., 0., 0., 0., 0.]])
"""
image = np.squeeze(image)