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A dynamic procedure for forming shape categories from skeletal shape trees

This report presents a dynamic procedure for the formation of category trees from a collection of skeletal shape trees. It overcomes several shortcomings of the formation procedure proposed by Baseski [4]. Unlike the method in [4], the structure of a category tree is not fixed at the beginning and can be updated in a dynamic way as a new example is considered. By this way, the true nature of category concept that is flexibility can be achieved.