光学学报, 2018, 38 (11): 1112003, 网络出版: 2019-05-09   

一种无需滤波的复合光栅投影的在线三维测量方法 下载: 708次

An On-Line Three-Dimensional Measurement Method of Composite Grating Projection Without Filtering
作者单位
1 湖北大学物理与电子科学学院, 铁电压电材料与器件湖北省重点实验室, 湖北 武汉 430062
2 四川大学光电科学技术系, 四川 成都 610064
3 太原科技大学电子信息工程学院, 山西 太原 030024
摘要
针对流水线上在线运动的刚性物体,投影复合光栅可以解决像素匹配和相位展开对条纹频率不同需求的矛盾,但在相位计算时,需对复合光栅进行滤波,该过程会降低重构精度。基于Stoilov算法,提出一种无需滤波的复合光栅投影的在线三维测量方法,设计复合条纹使低频条纹相移方向与被测物体的运动方向平行,像素匹配后被测物体的运动被转化为低频条纹的相移;高频条纹相移方向与被测物体运动方向垂直,像素匹配后各帧变形条纹图中高频条纹的光强分布完全一致,可直接进行相位计算,避开了因滤波造成的精度损失。同时在复合光栅中高频条纹的强度远低于低频条纹,故可将其看作微弱的背景光,保证了在线三维测量的精度。通过仿真与实验验证了该方法的有效性。
Abstract
For rigid objects moving on-line on the pipeline, the projection composite grating can solve the contradiction between different frequency requirements for pixel matching and phase unwrapping. However, when the phase is calculated, it is necessary to filter the composite grating, which will reduce the reconstruction accuracy. Based on Stoilov algorithm, an on-line three-dimensional(3D) measurement method of composite grating projection without filtering is proposed. By the design of the composite fringe, the phase shift direction of the low-frequency fringe is parallel to the moving direction of the measured object, and the motion of the measured object after pixel matching is converted into the phase shift of the low-frequency fringe. The phase shift direction of the high-frequency fringe is perpendicular to the moving direction of the measured object, and the light intensity distribution of the high-frequency fringe in each frame deformed fringe pattern after pixel matching is exactly the same. Therefore, the phase calculation can be performed directly, and the loss of accuracy is avoided due to filtering. Meanwhile, the intensity of the high-frequency fringe in the composite grating is much lower than that of the low-frequency component, so the high-frequency fringe can be regarded as a weak background light. The accuracy of on-line 3D measurement is guaranteed. Simulations and experiments prove the proposed method’s validity.

彭旷, 曹益平, 武迎春. 一种无需滤波的复合光栅投影的在线三维测量方法[J]. 光学学报, 2018, 38(11): 1112003. Kuang Peng, Yiping Cao, Yingchun Wu. An On-Line Three-Dimensional Measurement Method of Composite Grating Projection Without Filtering[J]. Acta Optica Sinica, 2018, 38(11): 1112003.

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