首先在0~180度方向上投影，计算每个角度上的投影图像的熵值，最小熵值对应的角度即为图像的光照无关角，然后获取图像的光照无关投影图像-光照无关图。-First, from 0 to 180 degrees in the direction of the projection, calculate the entropy of the projected image on every angle, the angle corresponding to the minimum entropy val