视觉系统光学渐晕效应非线性补偿方法
Nonlinear compensation for optical vignetting in vision systems

视觉系统在工业生产等领域的应用越来越广泛，而光学渐晕效应直接影响着成像系统采集图像的质量，进而影响了视觉检测的精度。该文提出了一种光学渐晕效应非线性补偿方法，基于对渐晕效应的原理分析，定义了图像的相对曝光量，利用耦合采样解耦重建的方式，求解相机响应函数，构建渐晕效应补偿模型对图像进行渐晕效应校正，从而保证光学系统成像质量。实验结果表明：该方法具有可行性，能够有效消除镜头的渐晕效应，为视觉检测系统的高精度检测提供了保障。
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.