Long-depth-volume 3D measurements using multithread monocular fringe projection profilometry

Minghui Duan; Ben Wang; Yabing Zheng; Yi Jin; Jinjin Zheng

doi:10.1117/12.2626748

27 March 2022 Long-depth-volume 3D measurements using multithread monocular fringe projection profilometry

Minghui Duan, Ben Wang, Yabing Zheng, Yi Jin, Jinjin Zheng

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169B9 (2022) https://doi.org/10.1117/12.2626748
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Stereo-assisted fringe projection profilometry (FPP) has been broadly applied to 3-D measurements because of its accuracy and stability advantages. However, absolute phase unwrapping requires an ever-increasing number of cameras to continuously enlarge the measurement depth volume without spatial uncertainty, which inevitably reduces calibration reliability and system flexibility. This paper proposes a multithread monocular FPP to implement long-depth-volume 3-D measurements. For achieving the multithread FPP technique, a galvanomirrorbased camera-projector system with variable extrinsic parameters is developed. The typical combination of a camera and a projector is virtually converted into multiple monocular active vision systems through fast viewpoint switching. Based on the spatio-temporal correlation of multiple viewpoints, each wrapped phase can obtain a possible fringe order map. Subsequently, with the geometric constraints of the system, the wrapped phase maps extracted from image sequences are converted into relative phase distributions. Combining the possible fringe orders and the relative phase map, the absolute phase distribution is determined by choosing the correct phase map from all potential candidates. Experimental results demonstrate that the proposed method could accomplish long-depth-volume 3-D measurements with a measuring accuracy of 0.02 mm.

Citation Download Citation

Minghui Duan, Ben Wang, Yabing Zheng, Yi Jin, and Jinjin Zheng "Long-depth-volume 3D measurements using multithread monocular fringe projection profilometry", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169B9 (27 March 2022); https://doi.org/10.1117/12.2626748

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KEYWORDS

3D metrology

Imaging systems

Cameras

Projection systems

3D acquisition

Fringe analysis

Phase shift keying

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