CSG-EESI: a new solid representation scheme and a conversion expertsystem
Xie, S.
Calvert, T.W.
Sch. of Comput. Sci., Simon Fraser Univ., Burnaby, BC;
This paper appears in: Pattern Analysis and Machine Intelligence, IEEE Transactions on
Publication Date: Mar 1988
Volume: 10,
Issue: 2
On page(s): 221-234
ISSN: 0162-8828
References Cited: 29
CODEN: ITPIDJ
INSPEC Accession Number: 3144001
Digital Object Identifier: 10.1109/34.3884
Current Version Published: 2002-08-06
Abstract
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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