Ms. Yuhao Shang Profile

Yuhao Shang

at Nanjing Univ of Science and Technology

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Proceedings Article | 7 October 2020 Paper

Robust absolute 3D measurement using stereo cost-volume filtering for fringe orders

Yuhao Shang, Wei Yin, Tianyang Tao, Shijie Feng, Qian Chen, Chao Zuo

Proceedings Volume 11571, 1157117 (2020) https://doi.org/10.1117/12.2580542

KEYWORDS: 3D metrology, Fringe analysis, Speckle pattern, Phase shifts, Projection systems, 3D modeling, Speckle, Optical filters

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In fringe projection profilometry (FPP), the phase-shifting profilometry (PSP) is widely used in various fields such as industrial quality check and biomechanics. Among the methods of PSP for absolute phase retrieval, stereo phase unwrapping method, as a new-fashioned method, can eliminate the 2π phase ambiguities and obtain a continuous phase map with a stereo vision system, retrieving the correct fringe period with geometry constraints and depth constraints and not needing to project any additional patterns. However, ensuring the stability of stereo phase unwrapping, the frequency of fringe patterns should be limited at about 20, which affects the accuracy of the 3D shape measurement. Furthermore, in order to enhance the performance of stereo phase unwrapping, stereo block matching based on the speckles as additional auxiliary information is used, which can distinguish several periodic candidate points but still not avoid mismatches, especially for the areas of the dark regions and the object edges where the fringe quality is low. To solve these problems, we proposed a robust absolute 3D measurement using stereo cost-volume filtering for fringe orders in this paper. In the proposed method, besides the stereo block matching, a matching cost filter is designed to aggregate the preliminary matching cost for the final cost which is used to obtain the fringe order map by WTA and then the absolute phase map. Then the more robust and more accurate 3D measurement is realized compared with traditional methods. The experimental results demonstrate that the proposed method can achieve robust absolute 3D measurement using stereo phase unwrapping.

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