A new mathematical model of vision coordinates,called as the co-plane-four-control point model,is proposed.The analytical solution of coordinates based on coplanar four control points are deduced.With the least square fitting method,the plane of the four control points in the camera coordinate system is fitted,and the coordinates of the measured point are obtained.This model is ally experiment compared with the three control point model.The results show that the proposed model in this paper is very simple,a...