Added more objects to skeletonize demo

doc/examples/plot_skeleton.py

@@ -1,15 +1,41 @@
+"""
+===========
+Skeletonize
+===========
+
+An example of thinning a binary image using skeletonize.
+"""
 from scikits.image.morphology import skeletonize
+from scikits.image.draw import draw
 import numpy as np
 import matplotlib.pyplot as plt
 
+# an empty image
 image = np.zeros((400, 400))
+
+# foreground object 1
 image[10:-10, 10:100] = 1
 image[-100:-10, 10:-10] = 1
 image[10:-10, -100:-10] = 1
 
+# foreground object 2
+rs, cs = draw.bresenham(250, 150, 10, 280)
+for i in range(10): image[rs+i, cs] = 1 
+rs, cs = draw.bresenham(10, 150, 250, 280)
+for i in range(20): image[rs+i, cs] = 1 
+
+# foreground object 3
+ir, ic = np.indices(image.shape)
+circle1 = (ic - 135)**2 + (ir - 150)**2 < 30**2
+circle2 = (ic - 135)**2 + (ir - 150)**2 < 20**2
+image[circle1] = 1
+image[circle2] = 0
+
+# perform skeletonization
 skeleton = skeletonize.skeletonize(image)
 
-plt.figure(figsize=(8,5))
+# display results
+plt.figure(figsize=(10,6))
 
 plt.subplot(121)
 plt.imshow(image, cmap=plt.cm.gray)