Prof. Changan Zhu Profile

Prof. Changan Zhu

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Proceedings Article | 15 February 2022 Paper

Few-pattern defocusing fringe projection profilometry for high-speed 3-D imaging

Chunmei Xu, Yi Jin, Minghui Duan, Yabing Zheng, Zheng Sun, Changan Zhu, Yan Kan

Proceedings Volume 12166, 121667U (2022) https://doi.org/10.1117/12.2618015

KEYWORDS: Binary data, Fringe analysis, Modulation, 3D metrology, Phase shifts, Phase shift keying, 3D image processing, Projection systems, Composites

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Fringe projection profilometry (FPP) based on the binary defocusing technique (BD) shows great potential in high-speed 3-D imaging. Due to the constant defocusing degree, existing binary defocusing operations require adopting similar-wavelength fringe patterns, thereby forming a long imaging sequence in multi-frequency temporal phase unwrapping (TPU). In this paper, we propose a few-pattern defocusing FPP for efficient and accurate 3-D imaging. The imaging sequence consists of only 6 hybrid images, namely 2 unit-frequency ramp images, 2 low-frequency, and 2 high-frequency sinusoidal fringe images. Combining unit-frequency ramp and low-frequency fringe images, the unknown average intensity and fringe orders of fringe images can be determined. Consequently, the final absolute phase map can be extracted from the high-frequency fringe images. Moreover, a kernel-optimized dithering technique is presented to generate the projected patterns of hybrid images. In this dithering technique, a dynamic kernel and a dual-objective function ensure the optimal binarization of defocused images with different grayscale variations. Experiment results verify the proposed few-pattern defocusing FPP achieves efficient 3-D imaging with a measurement accuracy of 0.02 mm.

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