Drawing Region Adjacency Graphs (RAGs)ΒΆ

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

RAG drawn with default settings, RAG drawn with grayscale image and viridis colormap
from skimage import data, segmentation
from skimage.future import graph
from matplotlib import pyplot as plt


img = data.coffee()
labels = segmentation.slic(img, compactness=30, n_segments=400, start_label=1)
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:
    a.axis('off')

plt.tight_layout()
plt.show()

Total running time of the script: ( 0 minutes 2.888 seconds)

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