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The Hamilton-Jacobi approach has proved to be a powerful and elegant method for extracting the skeleton of a shape. The approach is based on the fact that the inward evolving boundary flux is conservative everywhere except at skeletal points. Nonetheless this method appears to overlook the fact that the linear density of the evolving boundary front is not constant where the front is curved. In this paper we present an analysis which takes into account variations of density due to boundarydoi:10.1109/cvpr.2003.1211438 dblp:conf/cvpr/TorselloH03 fatcat:thksekxhircald7u5syglp4zau