An Occlusion-Based Representation of Shape for Viewpoint Recovery

. In this paper we present the geometry and the algorithms for organizing and using a viewer-centered representation of the occluding contour of polyhedra. The representation is computed from a polyhedral model under orthographic projection for all viewing directions. Using this representation, we derive constraints on viewpoint correspondences between image features and model contours. Our results show that the occluding contour, computed in a model-based framework, can be used to strongly constrain the viewpoints where a 3D model matches the occluding contour features of the image. Keywords: occlusion, occluding contour, rim appearance representation, viewer-centered 1 Introduction In this paper, we present an approach to modeling the occluding contour of polyhedra. The rim appearance representation encodes how the rim projects to the image to form the occluding contour for all viewpoints [11]. This precomputed model of how the contour can appear provides a set of constraints in v..