Learning Shape Models from Examples

摘要

This paper addresses the problem of learning shape models from examples. The contributions are twofold. First, a comparative study is performed of various methods for establishing shape correspondence -based on shape decomposition, feature selection and alignment. Various registration methods using polygonal and Fourier features are extended to deal with shapes at multiple scales and the importance of doing so is illustrated. Second, we consider an appearance-based modeling technique which represents a shape distribution in terms of clusters containing similar shapes; each cluster is associated with a separate feature space. This representation is obtained by applying a novel simultaneous shape registration and clustering procedure on a set of training shapes. We illustrate the various techniques on pedestrian and plane shapes.