High-frequency phase-unwrapping fringe projection profilometry based on period background coding and geometric constraints

Bingquan Guo; Yibo Wu; Rui Di; Baoan Song

doi:10.1117/12.3031595

18 July 2024 High-frequency phase-unwrapping fringe projection profilometry based on period background coding and geometric constraints

Bingquan Guo, Yibo Wu, Rui Di, Baoan Song

Author Affiliations +

Proceedings Volume 13179, International Conference on Optics and Machine Vision (ICOMV 2024); 131791O (2024) https://doi.org/10.1117/12.3031595
Event: International Conference on Optics and Machine Vision (ICOMV 2024), 2024, Nanchang, China

Abstract

A fringe projection profilometry with a large depth range geometric constraint is proposed, which can periodically encode the background without reducing the fringe amplitude to achieve high-frequency phase unwrapping. This method makes adequate use of the redundant part of the sinusoidal signal to embed the period information into the background, which ensures that the fringes have high signal-to-noise ratios; furthermore, in order to realize the high-frequency phase unwrapping, we introduce geometric constraints into the fringe projection system, whereby the depth range of the 3D measurement system is effectively extended. In addition, a phase-based compensation method is proposed to compensate for period orders at the edges of the period background encoding. Compared with the conventional phase coding method, this method performs period encoding of the background and avoids the problem of incorrect period order due to system nonlinearity. Also, the measurement depth range for geometric constraints is significantly extended without the need to obtain any information about the object in advance. Experimentally, the 3D profile of a standard plane, a complex object and separated objects were measured using the proposed method. The results show that this method can achieve fast and high-precision measurement of object contours using four fringe patterns.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Bingquan Guo, Yibo Wu, Rui Di, and Baoan Song "High-frequency phase-unwrapping fringe projection profilometry based on period background coding and geometric constraints", Proc. SPIE 13179, International Conference on Optics and Machine Vision (ICOMV 2024), 131791O (18 July 2024); https://doi.org/10.1117/12.3031595

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KEYWORDS

Phase unwrapping

Fringe analysis

Signal to noise ratio

3D metrology

Cameras

Projection systems

3D projection

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