通过很多摄像机坐标系下的点，拟合平面方程，摄像机坐标系下可以得到一条直线方程，光刀平面和靶标平面相交线上每一点的世界坐标(By using the points in many camera coordinate systems to fit the plane equations, a linear equation can be obtained under the camera coordinate system, and the world coordinates of each poi