Full-period fringe order correction method based on dual-threshold cellular automaton

Wu, Haitao; Cao, Yiping; Dai, Yongbo; Wei, Zhimi; Li, Hongmei

doi:10.1016/j.optlastec.2023.109989

Optics & Laser Technology

2024

DOI: 10.1016/j.optlastec.2023.109989

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Full-period fringe order correction method based on dual-threshold cellular automaton

Haitao Wu,

Yiping Cao,

Yongbo Dai

et al.

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2024

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Cited by 4 publications

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Nonlinear error self-correction for fringe projection profilometry with minimum phase probability variance

Zheng,

Duan,

Zhang

et al. 2024

Optics & Laser Technology

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Nonlinear error self-correction for fringe projection profilometry with minimum phase probability variance

Zheng,

Duan,

Zhang

et al. 2024

Optics & Laser Technology

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A ternary complementary Gray code phase unwrapping method in fringe projection profilometry

Wei,

Li,

Liu

et al. 2024

Journal of Applied Physics

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This paper proposes a phase unwrapping method based on ternary Gray code in fringe projection profilometry. This method does not require additional projection images or any prior knowledge. It accurately determines the segmentation thresholds of the ternary Gray code using only the average intensity and intensity modulation calculated from phase-shifting fringes, effectively reducing projection costs and achieving lower codeword errors. Additionally, a segment selection strategy suitable for the ternary Gray code is proposed. By employing the complementary method, three sets of candidate orders with certain codeword shifts can be generated. The wrapped phase is then divided into three segments: upper, middle, and lower segments, and correspondingly matched with the central regions of the three sets of candidate orders, thus enabling the solution of the absolute phase. Through the segment selection strategy, error-prone areas at the edges of orders are effectively avoided, further enhancing the accuracy of measurement results. Compared to the binary Gray code, the ternary complementary Gray code can encode up to 3m−1 orders when the number of Gray code patterns is m; when the required number of encoding orders is K, only ⌈log3K⌉+1 Gray code patterns are needed. Its additional value capacity precisely enables it to encode more orders, thereby increasing the frequency of phase-shifting fringes and further enhancing measurement efficiency. A series of experiments validates the feasibility, robustness, and superiority of this method.

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Method of unwrapped phase error correction in phase-measuring profilometry based on adaptive local window

Zou,

Luo,

Sun

et al. 2023

Journal of Modern Optics

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Full-period fringe order correction method based on dual-threshold cellular automaton

Cited by 4 publications

References 34 publications

Nonlinear error self-correction for fringe projection profilometry with minimum phase probability variance

Nonlinear error self-correction for fringe projection profilometry with minimum phase probability variance

A ternary complementary Gray code phase unwrapping method in fringe projection profilometry

Method of unwrapped phase error correction in phase-measuring profilometry based on adaptive local window

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