期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 32, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6501/abddf2
关键词
3D shape measurement; structured-light; phase shifting profilometry; digital image correlation; stereo vision
资金
- National Science Fund for Excellent Young Scholars [51722509]
- National Key Research and Development Program of China [2017YFB1104700]
- Program for Science and Technology Innovation Group of Shaanxi Province [2019TD-011]
- Key Research and Development Program of Shaanxi Province [2020ZDLGY04-02]
This paper presents a method for accurate and dynamic 3D shape measurements using only four projected patterns, including three-step phase-shifting patterns and one speckle pattern. By utilizing digital image correlation and multi-view geometry principles, the absolute phase can be reliably recovered without requiring any embedded features or pre-defined information. The proposed method achieves high-speed and accurate 3D shape measurements with an accuracy of 10.64 μm, outperforming traditional methods and providing guidance for 3D profilometry and measurement engineering.
Phase-shifting profilometry (PSP) has been widely used in structured-light (SL) systems for three-dimensional (3D) shape measurements, but the speed of the PSP technique is limited by increased phase-shifting patterns. This paper proposes an accurate and dynamic 3D shape measurement method by projecting only four patterns, including three-step phase-shifting patterns and one speckle pattern. Three-step phase-shifting images are used to obtain the initial unwrapped phase map with phase ambiguity. Based on the principle of digital image correlation and multi-view geometry, the absolute phase can be recovered reliably without requiring any embedded features or pre-defined information of the object. To improve the measurement accuracy, the projector coordinate is used as the measuring coordinate to establish a novel stereo SL system model. By solving a least square solution using the triple-view information, accurate 3D surface data can be reconstructed. The experimental results indicate that the proposed method can perform high-speed and accurate 3D shape measurements with an accuracy of 10.64 mu m, which is superior to conventional methods and has certain instructive significance for 3D profilometry and measurement engineering.
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