关键词: 逆向工程, 数据处理, 曲线插值, 小波分解

Abstract: According to the cloudy data achieved by three coordinate measuring machines, a method of reconstructing quasi-uniform B-Spline surface and decomposing it with wavelets was proposed. Topology information could automatically be established by delaminating and ordering the measured data points. In order to generate rectangle field grids, Non-uniform B-Spline curve was constructed and interpolated on scanning line data points，then it was sampled uniformly. Therefore the accuracy of interpolated surface was guaranteed. After decomposing the calculated control points with wavelets, multi-rank approximate surfaces could be obtained. By adopting object-oriented programming technique, corresponding modules was developed. Using writing engine, the reconstructed and decomposed surfaces could be saved as IGES files, which could be put into commercial 3D Computer Aided Design (CAD) software with better engineering value.

Key words: reverse engineering, data processing, curve interpolation, wavelet decomposition