基于组合式测量的复合材料点云数据拼合及模型重建 2.docVIP

 基于组合式测量的复合材料点云数据拼合 及模型重建# 殷志昂，朱延娟** 5 10 15 20 25 30 （同济大学航空航天与力学学院，上海　２０００９２） 摘要：针对大尺寸复合材料薄膜表面信息采集，提出一种组合式测量方法，由摄影测量系统 与三维扫描系统结合，进行数据采集和拼合，从而完成模型重建。首先通过 CCD 相机对布 置在物体非接触表面的标记点和编码标记点完成区域定位，根据基于 SVD 分解的配准算法， 通过若干区域的公共编码标记点使区域数据拼合到全局坐标系统；将三维扫描仪测得的局部 数据通过标记点在区域坐标系统中的定位，根据配准算法完成局部数据在区域坐标系统下的 拼合，进而配准到全局坐标系统。对整体优化配准后的数据进行曲面重构，以及平面度分析 等进一步的研究。实验结果表明，该方法有效可行，区域和局部拼合误差合理。 关键词：大尺寸；信息采集；SVD 分解；数据拼合；模型重建 中图分类号：TP391 Point Clouds Data Registration and Model Reconstruction of Composite Material Based on Combined Measurement Yin ZhiAng, Zhu Yanjuan (School of Aerospace Engineering and Applied Mechanics,Tongji University, Shanghai 200092) Abstract: To complete the surface information collection of large size composite material, a measurement method combining photographic measurement system and flowing three-dimensional scanning system is presented, and conducts data collection and registration, completing the model reconstruction. First finish the region location for mark points and coding mark points arranged at the non-contact surface of the object by CCD camera, according to the registration algorithm based SVD, put the local data together in the global coordinate system through several regions public coding mark points; then according to registration algorithm, merge the local data obtained via the three-dimensional scanner in global coordinate system by the location of mark points in regional coordinate system. The paper makes further study such as surface reconstruction for optimized and registration data and flatness analysis. The result of experiment shows that this method is effective and feasible and errors of regional and local registration meet the requirements. Key words: Large-scale; information collection; SVD; data registration; model reconstruction 35 0 引言 逆向工程广泛应用于航空、航天、汽车、模具、医学、工艺美术等行业，成为产品开发、 模具检测、虚拟仿真、文物复原等的重要技术手段[1]。逆向工程有几个关键技术，即数据采 集、数据预处理、数据分块与曲面重构、模型构造。 40 数据采集是逆向工程的首要环节，随着科技的发展，大型尺寸测量、检测逐渐成为新的 研究热点[2,3]，特别是在航空航天领域，测量范围大，被测面复杂，测量精度要求高，传统 的测量方法很难