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16 Contours from apparent motion: A computational theory


Human vision readily constructs subjective contours from displays of kinetic occlusion and olor from motion. To construct these contours from kinetic displays it is argued that human vision must solve the point-aperture problem, a problem more general and more difficult than the well-known aperture problem. In the aperture problem one is given a contour and its orthogonal velocity field, and must compute the full velocity field: in the point-aperture problem one is given neither the curve nor any components, of its velocity field, and must construct both the curve and its full velocity field. We formalize the point-aperture problem and present, in special cases, two simple algorithms for its solution. © 2001 Elsevier B.V. All rights reserved.

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