关键词: 三维重建, 线框模型, 实体模型, 面序列, 确定性面序列

Abstract: To speed the reconstruction of 3D curvilinear objects, a new face-decision method is presented in the process of generating 3D object from three orthographic views using the Brep oriented approach. In this method, two concepts, i.e., facesequence and certainfacesequence, are introduced, and a group of basic decision rules are abstracted according to the characteristics of orthographic projection, the definitions and properties of 2manifolds, and M?bius rule as well. During the face decision process, all facesequences and certain-face-sequences among the candidate faces are identified first, and each is regarded as a topological isomorphic face. All valid faces then can be found and assembled to compose the ultimate objects according to these decision rules. The method reduces the search space and improves the efficiency of the algorithm consequently by searching for face-sequences and identifying certainfacesequences during the reconstruction process.

Key words: 3D reconstruction, wire-frame model, solid model, face-sequence, certain-face-sequence