High dynamic range and fast 3D measurement based on a telecentric stereo-microscopic system

Yan Hu; Yichao Liang; Tianyang Tao; Wei Yin; Jiaming Qian; Shijie Feng; Chao Zuo; Qian Chen

doi:10.1117/12.2547762

16 October 2019 High dynamic range and fast 3D measurement based on a telecentric stereo-microscopic system

Yan Hu, Yichao Liang, Tianyang Tao, Wei Yin, Jiaming Qian, Shijie Feng, Chao Zuo, Qian Chen

Proceedings Volume 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019); 112052C (2019) https://doi.org/10.1117/12.2547762
Event: Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 2019, Phuket, Thailand

Abstract

In fringe projection profilometry, using denser fringes can improve the measurement accuracy. In real-time measurement situations, the number of the fringe pattern is limited to reduce motion-induced errors, which, however, poses more difficulties for the absolute phase recovery from dense fringes. In this paper, we propose a stereo phase matching method that takes advantage of the high-accuracy of denser fringes and the high-efficiency of using only two different frequencies of fringes. The phase map is divided into several sub-areas and in each sub-area, the phase is unwrapped independently. The correct matched pixel is easily selected from the distributed candidates in different sub-area with the help of geometry constraints.

Citation Download Citation

Yan Hu, Yichao Liang, Tianyang Tao, Wei Yin, Jiaming Qian, Shijie Feng, Chao Zuo, and Qian Chen "High dynamic range and fast 3D measurement based on a telecentric stereo-microscopic system", Proc. SPIE 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 112052C (16 October 2019); https://doi.org/10.1117/12.2547762

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