第20卷第3期 2012年3月
文章编号
1004-924X(2012)03-0462-06
光学精密工程
Optics and Precision Engineering
Vol.20No.3
Mar.2012
离轴三反时间延迟积分CCD相机内方位元素和
畸变的标定
吴国栋*
（中国科学院长春光学精密机械与物理研究所，吉林长春130033）
摘要：由于测绘相机的关键几何参数内方位元索和畸变的标定精度决定相机的立体测绘精度，本文提出了一种离轴三反时间延迟积分（TDI)CCD相机内方位元索和畸变的标定方法。介绍了离轴三反TDICCD相机的光学系统和像面拼接方法，明确了该相机内方位元素和畸变的含义。建立了标定系统及相应的数学模型，应用最小二乘回归法求得了内方位元素和畸变的表达式。利用提出的方法标定了相机的内方位元素和畸变，并对标定误差进行了分析。结果表明；该方法对主点的标定精度可达1.0μm(1o)，对主距的标定精度可达2.0μm(1o)，对畸变的标定精度为2.3μm(1a)。结果显示提出的标定方法快捷且有效。
关键词：时间延迟积分CCD相机；高轴三反相机；内方位元素；畸变；标定
中图分类号：V447.3;TH703
文献标识码：A
doi:10.3788/OPE.20122003.0462
Calibration of inner orientation parameters and distortion for
three-mirror off-axisTDICCD camera
WUGuo-dong
(ChangchunInstitute of Optics,FineMechanicsandPhysics, ChineseAcademyofSciences,Changchun130033,China) Correspondingauthor，E-mail:wuguodong@163.com
Abstract:Thestereo mapping precision of mapping cameras depends on the calibration precision of the geo metric parameters, such as inner orientation parameters and distortion, therefore, a new calibration method of inner orientation parameters and distortion for a three-mirror off-axis Time Delay Integration(TDI)CCD cam-era was proposed, The optical system and image plane stitching of the camera were introduced, and the mean ings of the inner orientation parameters and distortion were defined. A calibration system and corresponding mathematical model were established, then the expressions of inner orientation parameters and distortion were settled by the least square poly-regress method. A calibration experiment was performed on the camera, and results show that the point calibration accuracy and the focal calibration accuracy are better than 1, O μm(lo) and 2. 0 μm(1o), respectively. Moreover, the distortion calibration accuracy has been 2. 3 μm(1o). Obtained results demonstrate that the calibration method has the advantages in the speed and efficiency for three-mirror
收稿日期：2011-04-08；修订日期：2011-06-30.
基金项目：国家自然科学基金资助项目(No.60575025）