def normcut_segmentations(img):
#labels1 = segmentation.slic(img, compactness=3, n_segments=50)
labels1 = segmentation.slic(img,compactness=3,n_segments=20)
out1 = color.label2rgb(labels1, img)#, kind='avg')
#return labels1
g = graph.rag_mean_color(img, labels1, mode='similarity')
labels2 = graph.cut_normalized(labels1, g)
out2 = color.label2rgb(labels2, img,image_alpha=0.2)#, kind='avg')
return (labels1,labels2)
def test_cut_normalized():
img = np.zeros((100, 100, 3), dtype='uint8')
img[:50, :50] = 255, 255, 255
img[:50, 50:] = 254, 254, 254
img[50:, :50] = 2, 2, 2
img[50:, 50:] = 1, 1, 1
labels = np.zeros((100, 100), dtype='uint8')
labels[:50, :50] = 0
labels[:50, 50:] = 1
labels[50:, :50] = 2
labels[50:, 50:] = 3
rag = graph.rag_mean_color(img, labels, mode='similarity')
new_labels = graph.cut_normalized(labels, rag, in_place=False)
new_labels, _, _ = segmentation.relabel_sequential(new_labels)
# Two labels
assert new_labels.max() == 1
new_labels = graph.cut_normalized(labels, rag)
new_labels, _, _ = segmentation.relabel_sequential(new_labels)
assert new_labels.max() == 1
def test_cut_normalized():
img = np.zeros((100, 100, 3), dtype='uint8')
img[:50, :50] = 255, 255, 255
img[:50, 50:] = 254, 254, 254
img[50:, :50] = 2, 2, 2
img[50:, 50:] = 1, 1, 1
labels = np.zeros((100, 100), dtype='uint8')
labels[:50, :50] = 0
labels[:50, 50:] = 1
labels[50:, :50] = 2
labels[50:, 50:] = 3
rag = graph.rag_mean_color(img, labels, mode='similarity')
new_labels = graph.cut_normalized(labels, rag, in_place=False)
new_labels, _, _ = segmentation.relabel_sequential(new_labels)
# Two labels
assert new_labels.max() == 1
new_labels = graph.cut_normalized(labels, rag)
new_labels, _, _ = segmentation.relabel_sequential(new_labels)
assert new_labels.max() == 1
Normalized Cut
==============
This example constructs a Region Adjacency Graph (RAG) and recursively performs
a Normalized Cut on it.
References
----------
.. [1] Shi, J.; Malik, J., "Normalized cuts and image segmentation",
Pattern Analysis and Machine Intelligence,
IEEE Transactions on, vol. 22, no. 8, pp. 888-905, August 2000.
"""
from skimage import graph, data, io, segmentation, color
from matplotlib import pyplot as plt
img = data.coffee()
labels1 = segmentation.slic(img, compactness=30, n_segments=400)
out1 = color.label2rgb(labels1, img, kind='avg')
g = graph.rag_mean_color(img, labels1, mode='similarity')
labels2 = graph.cut_normalized(labels1, g)
out2 = color.label2rgb(labels2, img, kind='avg')
plt.figure()
io.imshow(out1)
plt.figure()
io.imshow(out2)
io.show()
