将管道环形图像的展开成矩形图像后，使用此程序对矩形图像进行光照补偿。补偿原理为采集环形图像的径向平均灰度值，最后得到补偿曲线。-The image is expanded into a circular pipe rectangular image, use this procedure on a rectangular image illumination compensation. Compensation principle for the acquisition annular radi