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High-speed three-dimensional shape measurement using improved bi-frequency scheme and number-theoretical phase unwrapping
Author(s): Wei Yin; Chao Zuo; Shijie Feng; Tianyang Tao; Qian Chen
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Paper Abstract

In recent years, fringe projection profilometry (FPP), as a kind of three-dimensional shape measurement technology, has achieved the great breakthrough, due to the rapid development of the high-speed camera and high-speed projection equipment. The number-theoretical approach, as a classical method for the temporal phase unwrapping algorithm, is suitable for the binary defocusing FPP since it can avoid the acquiring of low frequency fringes. However, in order to ensure the stability of phase unwrapping, the period of fringe is generally around 20, which leads to the limited accuracy of 3D measurement. In this paper, we propose a bi-frequency number-theoretical phase unwrapping method with depth constraint. Using the principle of depth constraint, we will eliminate the period ambiguities of each pixel within a pixel-variant local period range so that the method only requires the coprime of two fringe frequencies within the local period range instead of the conventional global range. In this way, the requirement of stability of the traditional number-theoretical phase unwrapping can be adjusted from global range to local range. The stability is higher in the local period range due to containing less period ambiguities. As a result, we can realize phase unwrapping of higher frequency fringes with the same stability. Several experiments on various scenes are performed, verifying that our method can achieve high-speed and high-precision 3D measurement.

Paper Details

Date Published: 24 July 2018
PDF: 5 pages
Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 108271T (24 July 2018); doi: 10.1117/12.2500529
Show Author Affiliations
Wei Yin, Nanjing Univ. of Science and Technology (China)
Chao Zuo, Nanjing Univ. of Science and Technology (China)
Shijie Feng, Nanjing Univ. of Science and Technology (China)
Tianyang Tao, Nanjing Univ. of Science and Technology (China)
Qian Chen, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 10827:
Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018)
Yingjie Yu; Chao Zuo; Kemao Qian, Editor(s)

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