单目光栅投影系统的多频外差相位补偿

Multifrequency Heterodyne Phase Compensation for Monocular Grating Projection System

在通过单目光栅投影系统形成零件三维点云的过程中,零件表面及边界的反光会造成部分点云突变,使后续重建及测量过程出现误差。本文提出一种相位补偿方法,结合物体轮廓信息和相位等级图的递增特性设计图像处理算法,实现对连续相位图的补偿,减小零件表面及边界反光导致的干扰。实验结果表明,进行相位补偿后能使零件表面及边界点云突变的数量减少,提高在零件表面及边界存在反光的情况下三维点云的重建效果。

During the formation of a threedimensional(3D)point cloud of parts using the monocular grating projection system,the reflections of the surfaces and boundaries of parts cause the mutation of part point clouds,making errors in the subsequent reconstruction and measurement process.In this paper,a phase compensation method is proposed.An imageprocessing algorithm is designed by combining the contour information of the object and the increasing characteristics of the phaselevel graph to compensate for the continuous phase graph and reduce the interference caused by the reflections on the surfaces and boundaries of the parts.The experimental results show that phase compensation can reduce the number of point cloud mutations on the surface and boundary of parts.In addition,phase compensation can improve the reconstruction effect of the 3D point cloud in the case of reflections on the surfaces and boundaries of parts.