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中国科学院 长春光学精密机械与物理研究所, 吉林 长春 130033
收稿日期:2011-04-08,
修回日期:2011-06-30,
网络出版日期:2012-03-22,
纸质出版日期:2012-03-22
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吴国栋. 离轴三反时间延迟积分CCD相机内方位元素和畸变的标定[J]. 光学精密工程, 2012,(3): 462-467
WU Guo-dong. Calibration of inner orientation parameters and distortion for three-mirror off-axis TDICCD camera[J]. Editorial Office of Optics and Precision Engineering, 2012,(3): 462-467
吴国栋. 离轴三反时间延迟积分CCD相机内方位元素和畸变的标定[J]. 光学精密工程, 2012,(3): 462-467 DOI: 10.3788/OPE.20122003.0462.
WU Guo-dong. Calibration of inner orientation parameters and distortion for three-mirror off-axis TDICCD camera[J]. Editorial Office of Optics and Precision Engineering, 2012,(3): 462-467 DOI: 10.3788/OPE.20122003.0462.
由于测绘相机的关键几何参数内方位元素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相机内方位元素和畸变的标定方法。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1.0 m(1)
对主距的标定精度可达2.0 m(1)
对畸变的标定精度为2.3 m(1)。结果显示提出的标定方法快捷且有效。
The stereo mapping precision of mapping cameras depends on the calibration precision of the geometric 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 camera was proposed. The optical system and image plane stitching of the camera were introduced
and the meanings 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 1.0 m(1) and 2.0 m(1)
respectively.Moreover
the distortion calibration accuracy has been 2.3 m(1). Obtained results demonstrate that the calibration method has the advantages in the speed and efficiency for three-mirror off-axis TDICCD cameras.
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