Title :
Visual recognition of CAD objects with aspect graphs
Author :
Van Effelterre, T. ; Van Gool, L. ; Oosterlinck, A.
Author_Institution :
Katholieke Univ., Leuven, Heverlee, Belgium
Abstract :
The authors analyze how the geometrical model of objects from a CAD system can be used to build exactly a new representation of these objects that is better suited for visual recognition. A 3-D object has in general an infinite number of different 2-D images, depending on the viewpoint. Its image contours have, however, only a finite number of different topological aspects. An aspect graph is a graph in which the nodes are the stable aspects, and the arcs are the visual events that make the image contours switch from one stable aspect to another. It is shown how to compute exact aspect graphs of general CAD objects under perspective projection using results obtained here and algorithms from real algebraic geometry
Keywords :
CAD; algebra; computer vision; geometry; CAD objects; algebraic geometry; aspect graphs; geometrical model; image contours; perspective projection; topological aspects; visual recognition; Computational geometry; Design automation; Image analysis; Image recognition; Image segmentation; Machine vision; Mathematical model; Robot vision systems; Solid modeling; Topology;
Conference_Titel :
Intelligent Control, 1992., Proceedings of the 1992 IEEE International Symposium on
Conference_Location :
Glasgow
Print_ISBN :
0-7803-0546-9
DOI :
10.1109/ISIC.1992.225066
