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CSG-EESI: A New Solid Representation Scheme and a Conversion Expert System
March 1988 (vol. 10 no. 2)
pp. 221-234

A representation scheme is proposed for describing 3-D mechanical parts and structural bodies which are formed from planes and quadratic faces. Since the method combines features of the constructive solid geometry (CSG) representation and an extension of the enhanced (EESI) spherical image representation (ESI), it is designated the CSG-EESI. In this scheme, the body model is roughly divided into two levels: the higher level corresponds to a restricted CSG tree that contains the structural information describing how the various subparts form the body; the lower level contains the geometric information for those simple subparts and represents them by an extension of enhanced spherical images. The scheme can be used both as the medium between pictorial models and relational models and as an internal model to facilitate the recognition of bodies. An expert system written in C-PROLOG on a VAX 11/750 is presented that converts BR-like models into the CSG-EESI representation is presented.

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Index Terms:
3D solid object representation; computer vision; enhanced spherical image representation; constructive solid geometry; geometric information; pictorial models; relational models; expert system; C-PROLOG; VAX 11/750; CSG-EESI; computer vision; computerised pattern recognition; expert systems; trees (mathematics)
Citation:
S. Xie, T.W. Calvert, "CSG-EESI: A New Solid Representation Scheme and a Conversion Expert System," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 10, no. 2, pp. 221-234, March 1988, doi:10.1109/34.3884
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