提出了一种图像中心和纵横比的简易标定方法。控制相机绕光轴进行旋转并分别成像, 通过旋转前后图像之间的对应点, 推导出图像的主点和纵横比的闭式方程, 方程中仅包含图像的中心和纵横比, 去除了与其它相机参数之间的耦合, 其结果可以进一步用于畸变参数、外部参数和焦距的估计。分别进行了仿真图像和实拍图像实验, 实验结果表明, 此方法是可行的, 能够实现较精确的图像中心和纵横比的估计。

A new simple method is given for estimating image center and aspect ratio. Close equations are derived for estimating image center and aspect ratio by matching images with rotation change along optical axis. In the equations, only image center and aspect ratio are included, and the coupling between image center and aspect ratio with other camera parameters are removed. The calibrated results can be used further to estimate lens distortion coefficients, extrinsic parameters and focal length. Synthetic images and real images are used to validate proposed method. The experiment results show that the proposed method is feasible and accurate.