改进的三频四步相移面结构光三维重建算法  

Improved Three-Frequency Four-Step Phase-Shifted Surface Structured Light 3D Reconstruction Algorithm

作　　者：邓仕超[1] 周炉保 何新凯 DENG Shichao;ZHOU Lubao;HE Xinkai(Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学广西制造系统与先进制造技术重点实验室,桂林541004

出　　处：《组合机床与自动化加工技术》2024年第8期13-16,21,共5页Modular Machine Tool & Automatic Manufacturing Technique

摘　　要：针对面结构光中传统三频四步相移算法投影图片过多、效率较慢这一问题,提出了改进的三频四步相移面结构光重建算法。改进的算法需要3个高频率的正弦条纹图,但所需投影的条纹数量从传统算法的12张减少到了7张,最高频率的条纹图4张,次高频和最低条纹图分别为2张和1张,投影效率比传统算法提高了41.7%。介绍了改进算法的原理,将最高频率4张图所计算的包裹相位用来三维重建,其余两个频率条纹图计算的包裹相位用来进行相位展开,理论上该方法与传统算法精度一致。最后,通过实验验证了该算法的重建精度以及对具有复杂表面物体的三维重建能力。实验结果表明改进的面结构光算法在提高投影效率的同时与传统算法保持着一致的精度。To solve the problem that the traditional three-frequency four-step phase-shift algorithm has too many projection images and low efficiency,an improved three-frequency four-step phase-shift planar structured light reconstruction algorithm is proposed.The improved algorithm requires three sinusoidal fringe patterns of high frequency,but the number of fringe patterns required for projection is reduced from 12 to 7 in the traditional algorithm,4 fringe patterns of the highest frequency,2 fringe patterns of the sub-high frequency and 1 fringe patterns of the lowest frequency,respectively,and the projection efficiency is increased by 41.7%compared with the traditional algorithm.The principle of the improved algorithm is introduced.The enveloping phase calculated by the four highest frequency graphs is used for 3D reconstruction,and the enveloping phase calculated by the other two frequency fringe graphs is used for phase unwrapping.Finally,the algorithm′s reconstruction accuracy and 3D reconstruction ability of complex surface objects are verified by experiments.The experimental results show that the improved surface structured light algorithm can improve the projection efficiency and maintain the same accuracy as the traditional algorithm.

关 键 词：面结构光 三维重建 相移法 相位展开 

分 类 号：TH164[机械工程—机械制造及自动化] TG659[金属学及工艺—金属切削加工及机床]