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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 or contrast of the scene viewed by the camera is usually low, so the effect of vignetting on the camera performance is more severe. In this paper, we do some research on the vignetting and deduce a vignetting analytic formula about the field of view, the entrance pupil, the incident window and the distance between them. I type 32 yuan thermal imaging system, the actual data of the formula for the simulation and linear analysis, and the output image to compensate for the simulation results in order to eliminate the impact of vignetting. Theoretical and experimental results show that the vignetting compensation of the edge of the infrared image improves the image quality.