二维控制的数码相机分步检校方法研究

Study on the Step-by-Step Digital Camera Calibration Method Under 2D Control

数码相机在近景摄影测量中运用越来越广泛。针对二维控制的数码相机检校过程中内方位元素与外方位元素之间出现强相关问题,提出一种二维控制的数码相机分步检校方法。该方法避免在平差过程同时解算内方位元素与外方位元素,将内方位元素与外方位元素分步解算,从而避免出现强相关的情况;并且通过控制摄影的方式,将相机主距转变成两次摄站距离差的函数,将摄站距离差作为观测值,从而准确解算相机主距。最后以某工程为例,实验结果表明解算得到的相机畸变参数满足近景摄影测量的要求,验证了该方法的可行性。

Digital cameras are used more and more widely in close-range photogrammetry.In view of strong correlation problem of digital camera calibration under 2D control between interior orientation and exterior orientation elements,it proposed a method of step-by-step digital camera calibration under 2D control.In this method,the interior orientation elements and the exterior orientation elements are solved step by step,so as to avoid the occurrence of internal orientation elements and exterior orientation elements during the one adjustment process.At the same time,by controlling photography,the method transforms the camera principal distance into a function of the distance difference between two photography center.And the distance difference is taken as the observation value to accurately calculate the camera principal distance.Finally,a project is taken as an example,the experimental results show that the distortion parameters of the camera can meet the requirements of close-range photogrammetry,and the feasibility of the method is verified.