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Efficiently Computing and Representing Aspect Graphs of Polyhedral Objects
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Active Object Modeling with VIRTUE
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View planning for automated three-dimensional object reconstruction and inspection
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A fuzzy model for coverage evaluation of cameras and multi-camera networks
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Optimal positioning of sensors in 3d
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A versatile model-based visibility measure for geometric primitives
SCIA'05 Proceedings of the 14th Scandinavian conference on Image Analysis
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International Journal of Computer Vision
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This paper presents methods to compute the locus of all viewpoints from which features on known polyhedral objects can be viewed in their entirety without being occluded by anything in the environment. Convex and concave polyhedra with or without holes and the viewing model of perspective projection are employed in this work. Initially, properties of the occlusion-free and occluded loci of viewpoints are determined. Based on these properties, two methods to construct these loci together with their complexity analysis are presented. In the first method, a boundary representation of the occlusion-free locus is obtained. In the second method, the locus of occluded viewpoints is expressed in terms of a constructive solid geometry (CSG) representation that consists of a union of component solids. Implementation results and comparison of the two methods are given.