期刊
OPTICS AND LASERS IN ENGINEERING
卷 115, 期 -, 页码 21-31出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2018.11.006
关键词
High-speed 3D; Phase unwrapping; Number-theoretical approach; Depth constraint
类别
资金
- National Key R&D Program of China [2017YFF0106403]
- National Natural Science Fund of China [61722506, 61705105, 111574152]
- Final Assembly '13th Five-Year Plan' Advanced Research Project of China [30102070102]
- Equipment Advanced Research Fund of China [61404150202]
- Key Research and Development Program of Jiangsu Province, China [BE2017162]
- Outstanding Youth Foundation of Jiangsu Province of China [BK20170034]
- National Defense Science and Technology Foundation of China [0106173]
- 'Six Talent Peaks' project of Jiangsu Province, China [2015-DZXX-009]
- '333 Engineering' research project of Jiangsu Province, China [BRA2016407, BRA2015294]
- Fundamental Research Funds for the Central Universities [30917011204, 30916011322]
- Open Research Fund of Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense [3091601410414]
- China Postdoctoral Science Foundation [2017M621747]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1701038A]
In this paper, we propose a high-speed three-dimensional (3-D) shape measurement technique for dynamic scenes using geometry-constraint-based number-theoretical phase unwrapping. As a classical algorithm for temporal phase unwrapping (TPU), the number-theoretical approach is suitable for the binary defocusing fringe projection system since it can retrieve an absolute phase without using low-frequency fringe patterns. However, the conventional number-theoretical TPU approach cannot provide sufficient stability to unwrap a high-frequency phase since it requires the two fringe frequencies to be coprime within the global range of the projector coordinate. In contrast, using low-frequency fringe patterns tends to make phase unwrapping more reliable, but at the expense of the measurement precision. By introducing depth constraint into the traditional number-theoretical TPU, we only need to eliminate the phase ambiguity of each pixel within a small period range defined by the depth range, which means that our method just requires the two fringe frequencies to be coprime within the local period range instead of the conventional global range. Due to the reduction of fringe order candidates and the unambiguous phase range, the reliability of phase unwrapping can be significantly improved compared with the traditional number-theoretical TPU approach even when high-frequency fringe patterns are used. The proposed method has been successfully implemented on a high-frame-rate fringe projection system, achieving high-precision, robust, and absolute 3-D shape measurement at 3333 frames per second.
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