红外系统中渐晕的研究  

Research on vignetting in thermal imaging system

作　　者：雷春[1] 张保民[1] 冯生荣[2] 

机构地区：[1]南京理工大学,南京210014 [2]昆明物理研究所,昆明650223

出　　处：《红外与激光工程》2000年第4期13-16,21,共5页Infrared and Laser Engineering

摘　　要：热像仪观察的景物亮度或对比度通常很低 ,所以渐晕对热像仪性能的影响显得比较严重。文中对渐晕做了一些研究 ,并推导出一个渐晕关于视场角、入瞳、入射窗以及两者之间距离的解析式。利用Ⅰ类 32元热像仪系统的实际数据对该式进行仿真和线性分析 ,并根据仿真结果对输出图像进行补偿 ,以便消除渐晕的影响。理论和实验结果表明 ,对红外图像边缘区的渐晕补偿改善了图像的质量。The brightness and contrast of scenery which are observed by thermal imager are always very low, so the effect of vignetting on the performance of thermal imager is high. In this paper, the research on vignetting is done and a formula for vignetting about field angle、entrance window\, entrance pupil and the distance between them is deduced. This formula is simulated using the actual data from Class Ⅰ32 elements thermal imager and the linearity of change of vignetting is discussed, then the image is compensated with the simulation result,and the vignetting effects are eliminated. Theory and experiment indicate that the quality of image has been improved after processing of vigenetting offset to the marginal part of infrared image.

关 键 词：渐晕 入射光瞳 入射窗 视场角 红外系统 

分 类 号：TN216[电子电信—物理电子学]