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Beskrivelse
1.0 2 The attention then turned to the problem of "Body separation," i.e. separation of occluding bodies in a scene (See Guzman), Falk), and Waltz)). Grape ( Grape)) combined the separation of bodies with recognition, by removing parts of the scene recognized as belonging to a known body. All of these techniques were designed to work with polyhedral objects only, and extensively use the properties of edges and vertices. Though some impressive results have been reported ( Waltz], Grape)), and perhaps some useful abstractions can be made, the specific techniques used fail to generalize to a wider class of objects. Among previous work on curved objects, B.K.P. Horn ( Horn)) presented techniques for extracting three dimensional depth data from a TV image, using reflection characteristics of the surface. Krakauer ( Krakauer]) represented objects by connections of brightness contours. Ambler et al ( Ambler)) describe experiments with simple shapes, including curved objects, using relations within a two-dimensional image. However, none of these efforts really addresses the problem of "shape" representation and description. Work on outdoor scene analysis is also concerned with non-polyhedral objects ( Bajcsy], Yakimovsky]), but again no attention has been paid to shape analysis.
