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Definition 3 Skeleton Feature Points(SFP): Considering a
critical point as the center of a circle, we can determine the
tangent circle C of silhouette edges for this point. We
suppose the cps , which , as meaning of the critical
points set within the range of the circle C . Then we will just
discard all points belong to cp and only remain the center
point of C , which will be referred as the skeleton feature
point.
According to the definition 3, we traverse the rest critical
points with the same operation until no overlay regions of
tangent circles for critical points left. The skeletonization
process will benefit from different aspects offered by this
simplification mechanism, such as reduced critical points.