Abstract

High-speed and high-precision 3D shape measurement plays a central role in diverse applications such as automatic online inspection, robotics control, and human-computer interaction. Conventional multi-frame phase-shifting-based fringe projection profilometry techniques face inherent trade-offs between the speed and measurement precision, which are fundamentally limited by the fringe density and extra pattern projections used for de-ambiguity of fringe orders. Increasing the frequency of the projection fringes can obviously improve the measurement precision; however, it creates difficulties in the subsequent phase unwrapping. For this reason, to date, the frequency of the fringes in typical real-time 3D shape measurement techniques is generally less than 30 to guarantee a reasonable reliability of phase unwrapping. To overcome this limitation, a bi-frequency phase-shifting technique based on a multi-view fringe projection system is proposed, which significantly enhances the measurement precision without compromising the measurement speed. Based on the geometric constraints in a multi-view system, the unwrapped phase of the low-frequency (10-period) fringes can be obtained directly, which serves as a reference to unwrap the high-frequency phase map with a total number of periods of up to 160. Besides, the proposed scheme with 10-period and 160-period fringes is suitable for slightly defocusing projection, allowing a higher projection rate and measurement speed. Experiments on both static and dynamic scenes are performed, verifying that our method can achieve high-speed and high-precision 3D measurement at 300 frames per second with a precision of about 50 μm.

© 2017 Optical Society of America

High-speed 3D shape measurement using the optimized composite fringe patterns and stereo-assisted structured light system

Wei Yin, Shijie Feng, Tianyang Tao, Lei Huang, Maciej Trusiak, Qian Chen, and Chao Zuo
Opt. Express 27(3) 2411-2431 (2019)

Real-time 3-D shape measurement with composite phase-shifting fringes and multi-view system

Tianyang Tao, Qian Chen, Jian Da, Shijie Feng, Yan Hu, and Chao Zuo
Opt. Express 24(18) 20253-20269 (2016)

Robust and efficient multi-frequency temporal phase unwrapping: optimal fringe frequency and pattern sequence selection

Minliang Zhang, Qian Chen, Tianyang Tao, Shijie Feng, Yan Hu, Hui Li, and Chao Zuo
Opt. Express 25(17) 20381-20400 (2017)

Dynamic microscopic 3D shape measurement based on marker-embedded Fourier transform profilometry

Yan Hu, Qian Chen, Yuzhen Zhang, Shijie Feng, Tianyang Tao, Hui Li, Wei Yin, and Chao Zuo
Appl. Opt. 57(4) 772-780 (2018)

High-speed real-time 3D shape measurement based on adaptive depth constraint

Tianyang Tao, Qian Chen, Shijie Feng, Jiaming Qian, Yan Hu, Lei Huang, and Chao Zuo
Opt. Express 26(17) 22440-22456 (2018)