针对大视场摄像机标定中大尺寸靶标难以制作与维护、小尺寸靶标标定精度较低等问题，文章提出一种靶标姿态多方位的大视场摄像机标定方法。首先，将姿态多方位自由靶标在摄像机视场内任意摆放；然后，分别计算各个自由靶标图像所对应的内部参数和外部参数，进而获得摄像机参数的约束条件；最后，建立以重投影误差为最小的目标函数，并利用遗传算法获得摄像机参数的最优解。实验结果表明，该方法具有靶标摆放自由、标定精度高等特点，能够实现对大视场环境下摄像机的精确标定。%The calibration of camera with wide ifeld-of-view is a challenging problem because a target of large scale is hard to fabricate, while using a small scale can not satisfy the required accuracy. A camera calibration method based on free target is proposed to solve the calibration problem of camera with wide ifeld-of-view. Firstly, several planar targets are placed lfexibly according to the range of the camera’s view-field. Secondly, constraint condition of camera parameters is obtained by calculating intrinsic parameter and intrinsic parameter in every planar targets. Finally, the maximum likelihood estimate of the camera parameters is obtained by minimizing the re-projection error of feature points on all the planar targets. The experiment results show that the method proposed in this paper has the characteristics of free position of target and high accuracy of calibration, which can achieve the high precision calibration for camera with large ifeld-of-view.
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