说明：  摄像机标定中光心图像坐标确定方法，由所提出的两种方法求得的光心图像坐标在进行标定与三维测量时可达到较高的精度并且优于直 接用图像中心坐标进行标定与三维测量的精度
(Experiment and simulation results show that accuracy of two improved methods in calibration and 3D measurement is higher than that obtained from using image center directly.)