Removing harmonic distortion of measurements of a defocusing three-step phase-shifting digital fringe projection system

Xu, Zi‐Xin; Chan, Yuk‐Hee

doi:10.1016/j.optlaseng.2016.10.002

Cited by 15 publications

(3 citation statements)

References 20 publications

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“…In order to eliminate the influence of gamma error, we used the inverse error compensation method [36] to solve this problem in all the following experiments. The defocus degree of the devices has effect on the measurement error, but both simulation and experiment showed that the phase error caused by defocusing did not change significantly over a larger range [2,[37][38][39][40]. So we mainly focus on the errors caused by color coupling and imbalance.…”

Section: Methodsmentioning

confidence: 99%

“…It consists of a commercial projector and a digital camera. FPP technique mainly includes two steps: projecting and acquiring a sequence of phase-shifted sinusoidal fringe patterns [1][2][3][4][5][6]. In phase-shifting FPP methods, multiple fringe patterns are projected onto an object, and then the camera is used to capture the deformed patterns.…”

Section: Introductionmentioning

confidence: 99%

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Point-to-point compensation method for color coupling and imbalance in color-fringe pattern profilometry

Wu¹,

Wu²,

Zhang³

et al. 2020

J. Opt.

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Color-fringe pattern profilometry is widely developed for high-speed 3D shape measurement due to more information can be extracted through a single color pattern. However, previous researches show that the color coupling and imbalance of the system cause significant errors, which severely influence the accuracy of the color-fringe pattern profilometry. We proposed a point-to-point method to compensate the errors caused by color coupling and imbalance. Different from previous methods, the proposed method bases on the correspondence between camera pixels and projector pixels, which achieves point-to-point compensation of the full field. Experimental results verify that the proposed easy-to-operated method reduces the measurement errors significantly.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Point-to-point compensation method for color coupling and imbalance in color-fringe pattern profilometry

Wu¹,

Wu²,

Zhang³

et al. 2020

J. Opt.

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show abstract

“…The initiative phase error compensation method re-encodes the fringe pattern to be projected according to the calibrated system gamma value or error distribution law. Thus, the new code fringes can obtain a high-precision sinusoidal fringe pattern after passing through the system of the projector and the camera [22,24,27]. Zheng et al [28] obtained the average value of phase error of a row at the corresponding position by using the two-step method, then the least square method was applied to obtain the best pre-coding gamma value of the system.…”

Section: Introductionmentioning

confidence: 99%

An inverse error compensation method for color-fringe pattern profilometry

Wu¹,

Fan²,

Wu³

et al. 2020

J. Opt.

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Color-fringe pattern profilometry is a widely used method for high-speed measuring 3D surface because the RGB (red, green and blue) channels provide more information. However, the nonlinear response of the digital projector usually causes periodical phase errors. In this paper, we analyze the nonlinear error in color-fringe pattern profilometry, and propose a multifrequency fringe inverse error compensation method to reduce the phase error caused by the nonlinear response of the projector. The proposed method only needs to add one highest frequency RGB pattern, thus improving the measurement accuracy of color-fringe pattern profilometry. Different from other compensation methods, the proposed method does not need gamma calibration, the construction of a look-up-table of gamma values or many additional patterns, which are really time consuming. The experimental results demonstrated that the proposed method can effectively reduce the nonlinear effect of the projector and improve the measurement accuracy of color-fringe pattern profilometry.

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A multi-frequency inverse-phase error compensation method for projector nonlinear in 3D shape measurement

Mao

Liu

2018

Optics Communications

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Removing harmonic distortion of measurements of a defocusing three-step phase-shifting digital fringe projection system

Cited by 15 publications

References 20 publications

Point-to-point compensation method for color coupling and imbalance in color-fringe pattern profilometry

Point-to-point compensation method for color coupling and imbalance in color-fringe pattern profilometry

An inverse error compensation method for color-fringe pattern profilometry

A multi-frequency inverse-phase error compensation method for projector nonlinear in 3D shape measurement

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