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Skeleton comparisons: the junction neighbourhood histogram

For analysing and comparing characters, using skeletons is a promising approach due to their topology-preserving nature and the resemblance of the skeleton to the original writing movement. We suggest a novel qualitative approach to skeleton comparison that is based on the adjacency of junctions and end points and the steps of a preceding skeleton simplification. By using a multi-dimensional histogram that contains information about the adjacency and the degree of joints, we gain high comparison speeds which, when combined with the multi-step approach, can be used for a generic topology distance metric.