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Examples of cluster boundaries identified after global clustering: (a) superpixels identified by local clustering, (b) clusters of superpixels (k = 2), where each cluster is painted with a different color, (c) cluster boundaries (k = 2), (d) clusters of superpixels (k = 3), (e) cluster boundaries (k = 3), (f) clusters of superpixels (k = 4), and (g) cluster boundaries (k = 4).
