Nonlinear compensation for optical vignetting in vision systems

DING Ying; FAN Jingtao; QUAN Wei; HAN Cheng

doi:10.16511/j.cnki.qhdxxb.2017.25.025

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (7) : 702-706. DOI: 10.16511/j.cnki.qhdxxb.2017.25.025

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Nonlinear compensation for optical vignetting in vision systems

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Abstract

Visual inspection systems are being more and more widely applied in industrial production, but optical vignetting directly affects the imaging quality, which affects the inspection accuracy. A nonlinear compensation method for optical vignetting is given which uses the vignetting principle, to define the relative exposure of the image with coupled sampling and decoupling reconstruction to determine the camera response curve. A vignetting compensation model is then developed to eliminate the vignetting effect of the lens to improve the image quality. Tests show that the method is effective and provides excellent vision inspection quality.

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information processing / vision inspection / optical vignetting effect / nonlinear compensation / relative exposure

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DING Ying, FAN Jingtao, QUAN Wei, HAN Cheng. Nonlinear compensation for optical vignetting in vision systems[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(7): 702-706 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.025

References

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