Motion-compensated three-step phase-shifting profilometry

Shijie Feng; Chao Zuo; Tianyang Tao; Yan Hu; Qian Chen; Guohua Gu

doi:10.1117/12.2327129

24 July 2018 Motion-compensated three-step phase-shifting profilometry

Shijie Feng, Chao Zuo, Tianyang Tao, Yan Hu, Qian Chen, Guohua Gu

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 108271Q (2018) https://doi.org/10.1117/12.2327129
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

Abstract

Phase-shifting profilometry (PSP) is a widely used approach to high-accuracy three-dimensional shape measurements. However, when it comes to moving objects, phase errors induced by the movement often result in severe artifacts even though a high-speed camera is in use. From our observations, there are three kinds of motion artifacts: motion ripples, motion-induced phase unwrapping errors, and motion outliers. We present a novel motion-compensated PSP to remove the artifacts for dynamic measurements of rigid objects. The phase error of motion ripples is analyzed for the phaseshifting algorithm and is compensated using the statistical nature of the fringes. The phase unwrapping errors are corrected exploiting adjacent reliable pixels, and the outliers are removed by comparing the original phase map with a smoothed phase map. Compared with the three-step PSP, our method can improve the accuracy significantly for objects in motion

Citation Download Citation

Shijie Feng, Chao Zuo, Tianyang Tao, Yan Hu, Qian Chen, and Guohua Gu "Motion-compensated three-step phase-shifting profilometry", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 108271Q (24 July 2018); https://doi.org/10.1117/12.2327129

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