直线会与前面求得的摄像机坐标系下的相纸靶标平面有一个交点（xc1，yc1，zc1），同理可以得到另外一个相纸靶标平面的交点（xc2， yc2 ，zc2）(The straight line will have an intersection (xc1, yc1, zc1) with the photographic paper target plane obtained in the camera coordinate system above, and the intersection point of another photographic paper target plane (xc2, yc2, zc2))