Skeletons are region-based shape descriptors which summarize the general form of objects.
Skeleton-like shape features (i.e., centerlines, medial surfaces, and topological kernels) play important role in various applications in image processing, pattern
recognition, and visualization.
I shall define skeletons and present their properties.
Then the three major skeletonization techniques will be presented.
Finally some applications will be briefly outlined.
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