基于旋转正交性的测绘相机内方位元素标定方法  

Calibration method of inner orientation parameters for mapping camera based on orthogonality of orientation matrix

作　　者：远国勤[1] 丁亚林[1] 惠守文[1] 李友一[1] 李延伟[1] 赵嘉鑫[1] 

机构地区：[1]中国科学院航空光学成像与测量重点实验室中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《仪器仪表学报》2014年第1期185-190,共6页Chinese Journal of Scientific Instrument

基　　金：国家高分重大专项(民用部分)航空系统(30-H32A01-9005-12/12)资助项目

摘　　要：为了消除实验室内对测绘相机进行内方位元素标定过程中精密转台对标定精度的影响,提出了基于旋转矩阵正交性的内方位元素标定方法。首先,根据相机成像模型中的坐标变换分析了旋转矩阵的正交性,接着,详细介绍了基于旋转矩阵正交性的内方位元素的标定方法,并对该标定过程中涉及的参变量矩阵进行了分析计算,给出该标定方法具体的试验步骤。最后,采用Monte-Carlo算法给出对该标定算法的精度进行了分析。实验室内实际标定结果表明:采用该标定方法,在不需精密转台的情况下,内方位元素中主点的标定精度为3μm,主距的标定精度为5μm,可以满足测绘相机内方位元素的标定精度要求。In order to eliminate the influence of precise rotating platform on the camera calibration accuracy in the in- ner orientation parameter calibration process of mapping camera in laboratory, an inner orientation parameter calibra- tion method based on the orthogonality of orientation matrix is proposed. Firstly, the orthogonality of the orientation matrix is analyzed according to the coordinate transformation in the camera imaging model. Then, the inner orientation parameter calibration method based on the orthogonality of orientation matrix is described in detail. The variable ma- trices involved in the calibration process are analyzed and calculated, and the calibration steps are given as well. The accuracy of the proposed calibration method is analyzed using Monte-Carlo algorithm. The actual calibration results show that the principal point accuracy and principal distance accuracy obtained with the proposed method can reach to 3 pμm and 5 μm, respectively in laboratory environment without using the precise rotating platform, which can meet the inner orientation parameter calibration accuracy requirement of mapping camera.

关 键 词：内方位元素 成像模型 旋转矩阵正交性 测绘相机 

分 类 号：V556.5[航空宇航科学与技术—人机与环境工程] TP394.1[自动化与计算机技术—计算机应用技术]