渐晕是红外光学系统中普遍存在的现象,导致最后产生的红外图像存在不应有的亮暗失真情况.对渐晕产生的原因进行了分析,实际系统中不仅有几何渐晕还有透镜造成的渐晕,这两者共同影响图像质量.根据渐晕产生的原因,基于图像像素处理法和光线追迹法建立渐晕效应的数学模型,得到仿真图像并对仿真结果进行分析.理论和实验结果表明文中建立的模型更加完善,有利于红外传感器总体系统的仿真.

Vignetting effect is a common phenomenon in infrared optical system,which results in the brightness distortion situation in infrared image.This paper analyzes the causes of vignetting,which is not only caused by lens but also by geometry,both affect image quality.A mathematical model of the vignetting effect is established based on image pixel processing and ray tracing method according to the cause of vignetting.The simulation image is presented and simulation result is analyzed.Theory and experiment indicate that established model is more complete,which is helpful for infrared sensor simulation of the overall system.