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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Medial Axis LUT Computation for Chamfer Norms Using -Polytopes
verfasst von : Nicolas Normand, Pierre Évenou
Erschienen in: Discrete Geometry for Computer Imagery
Verlag: Springer Berlin Heidelberg
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Chamfer distances are discrete distances based on the propagation of local distances, or weights defined in a mask. The medial axis, i.e. the centers of the maximal disks (disks which are not contained in any other disk), is a powerful tool for shape representation and analysis. The extraction of maximal disks is performed in the general case with comparison tests involving look-up tables representing the covering relation of disks in a local neighborhood. Although look-up table values can be computed efficiently [1], the computation of the look-up table neighborhood tend to be very time-consuming. By using polytope [2] descriptions of the chamfer disks, the necessary operations to extract the look-up tables are greatly reduced.