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Merge pull request #642 from sciunto/convex_hull_ex

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Doc: Convex hull example. Improvement.
This commit is contained in:
Stefan van der Walt
2013-07-08 03:41:22 -07:00
parent f3b1b39158 acdfd8bc71
commit 47a0cd1a3f
1 changed files with 18 additions and 3 deletions
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doc/examples/plot_convex_hull.py
+18 -3
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@@ -27,9 +27,24 @@ image = np.array(
[0, 1, 0, 0, 0, 0, 0, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0]], dtype=float)
chull = convex_hull_image(image)
image[chull] += 1.7
image -= -1.7
original_image = np.copy(image)
chull = convex_hull_image(image)
image[chull] += 1
# image is now:
#[[ 0. 0. 0. 0. 0. 0. 0. 0. 0.]
# [ 0. 0. 0. 0. 2. 0. 0. 0. 0.]
# [ 0. 0. 0. 2. 1. 2. 0. 0. 0.]
# [ 0. 0. 2. 1. 1. 1. 2. 0. 0.]
# [ 0. 2. 1. 1. 1. 1. 1. 2. 0.]
# [ 0. 0. 0. 0. 0. 0. 0. 0. 0.]]
fig = plt.subplots(figsize=(10, 6))
plt.subplot(1, 2, 1)
plt.title('Original picture')
plt.imshow(original_image, cmap=plt.cm.gray, interpolation='nearest')
plt.subplot(1, 2, 2)
plt.title('Transformed picture')
plt.imshow(image, cmap=plt.cm.gray, interpolation='nearest')
plt.show()