Nonlinear compensation for optical vignetting in vision systems
DING Ying1, FAN Jingtao2, QUAN Wei1, HAN Cheng1
1. College of Computer Science and Technology, Changchun University of Science and Technology, Changchun 130022, China;
2. Department of Automation, Tsinghua University, Beijing 100084, China
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.
丁莹, 范静涛, 权巍, 韩成. 视觉系统光学渐晕效应非线性补偿方法[J]. 清华大学学报（自然科学版）, 2017, 57(7): 702-706.
DING Ying, FAN Jingtao, QUAN Wei, HAN Cheng. Nonlinear compensation for optical vignetting in vision systems. Journal of Tsinghua University(Science and Technology), 2017, 57(7): 702-706.
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2017, Vol. 57 
