Impact and correction of CCD nonlinear response on measurement of the laser beam quality

Wenbo, 景文博 Jing; Ruping, 张汝平 Zhang; Xiao-man, 王晓曼 Wang; Jie, 赵. 洁. Zhao; Shiyu, 杨世钰 Yang; Yangyang, 高洋洋 Gao

doi:10.3788/irla201746.0817004

红外与激光工程

2017

DOI: 10.3788/irla201746.0817004

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Impact and correction of CCD nonlinear response on measurement of the laser beam quality

景文博 Jing Wenbo¹,

张汝平 Zhang Ruping²,

王晓曼 Wang Xiao-man³

et al.

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2024

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Nonlinear correction method of digital fringe projection 3D measurement system based on precise precoding

Hong,

Zhao,

Zhu

et al. 2024

Opt. Eng.

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The fringe projection 3D measurement method is a widely used 3D measurement technology, which utilizes a digital projector as the structural light source. However, the nonlinear intensity response of projectors results in non-sinusoidal fringe images captured by cameras, introducing phase errors that undermine measurement accuracy. We propose a nonlinear correction method based on precise pre-coding for digital fringe projection 3D measurement systems. By encoding only two sets of four-step phase-shifting fringe images into the projector and modeling the relationship among gamma value, pre-coding value, and ideal phase, the algorithm estimates accurate pre-coding values. Experimental validation demonstrates significant reductions in phase error standard deviation post-gamma correction on standard whiteboards, leading to an ∼84% increase in 3D point cloud height accuracy. In addition, the proposed method effectively mitigates the periodic water ripple phenomenon induced by nonlinear gamma effects. Experimental investigations on plaster sculpture and printed circuit board further validate the method's superiority, achieving higher phase accuracy and point cloud precision, with a measurement accuracy of 0.1 mm.

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Nonlinear correction method of digital fringe projection 3D measurement system based on precise precoding

Hong,

Zhao,

Zhu

et al. 2024

Opt. Eng.

View full text Add to dashboard Cite

show abstract

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Impact and correction of CCD nonlinear response on measurement of the laser beam quality

Cited by 1 publication

References 0 publications

Nonlinear correction method of digital fringe projection 3D measurement system based on precise precoding

Nonlinear correction method of digital fringe projection 3D measurement system based on precise precoding

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