单目标旋转摄影方法标定图像全站仪相机

Camera calibration of image total station by single-target rotatry photography

为了实现图像全站仪望远镜相机和广角相机的高精度标定,采用单目标旋转摄影法推导了旋转摄影模式下图像全站仪的相机标定模型,并对模型参数展开相关性分析,针对其中存在的参数耦合问题,提出了双盘观测法进行参数解耦;对单目标旋转摄影方法的可行性进行了实验验证,取得了图像全站仪望远镜相机和广角相机的高精度标定结果。结果表明,标定得到的相机参数可用于不同摄影距离的图像测量,望远镜相机标定点重投影误差平均为1.0 pixel,对应图像角分辨率达2.0″;望远镜相机定焦摄影时标定点重投影误差平均为0.15 pixel,对应图像角分辨率达0.3″;广角相机标定点重投影误差平均为0.6 pixel,对应图像角分辨率达13.3″。该研究对提高图像全站仪的图像测量精度及拓展其相关应用有一定参考意义。

In order to achieve high-precision camera calibration of the image total station telescope camera and a wide-angle camera,a camera calibration model for the image total station in rotary photography mode was derived using a single target rotary photography method,and the correlation analysis of model parameters was performed.Aiming at the parameter coupling problem,a double-face observation method was proposed for parameter decoupling.The feasibility of the single target rotary photography method was experimentally verified,and high-precision calibration results of the image total station telescope camera and the wide-angle camera were obtained.The results show that the camera parameters obtained from calibration can be used for image measurement at different photographic distances,with an average reprojection error of 1.0 pixel at the calibration points of the telescope camera,and the corresponding image angular resolution is 2.0″.The average reprojection error at the calibration point during fixed focus photography with a telescope camera is 0.15 pixel,and the corresponding image angular resolution is 0.3″.The average reprojection error at the calibration point of a wide-angle camera is 0.6 pixel,and the corresponding image angular resolution is 13.3″.This research has certain reference significance for improving the image measurement accuracy of the image total station and expanding its related applications.