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Drawing Region Adjacency Graphs (RAGs)ΒΆ

This example constructs a Region Adjacency Graph (RAG) and draws it with the rag_draw method.

from skimage import data, segmentation
from skimage.future import graph
from matplotlib import pyplot as plt

img =
labels = segmentation.slic(img, compactness=30, n_segments=400)
g = graph.rag_mean_color(img, labels)

fig, ax = plt.subplots(nrows=2, sharex=True, sharey=True, figsize=(6, 8))

ax[0].set_title('RAG drawn with default settings')
lc = graph.show_rag(labels, g, img, ax=ax[0])
# specify the fraction of the plot area that will be used to draw the colorbar
fig.colorbar(lc, fraction=0.03, ax=ax[0])

ax[1].set_title('RAG drawn with grayscale image and viridis colormap')
lc = graph.show_rag(labels, g, img,
                    img_cmap='gray', edge_cmap='viridis', ax=ax[1])
fig.colorbar(lc, fraction=0.03, ax=ax[1])

for a in ax:


Total running time of the script: ( 0 minutes 2.825 seconds)

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