高精度CCD拼接相机标定方法研究

Research of Calibration Method for High-precision CCD Butting Cameras

介绍了大视场CCD(电荷耦合器件)拼接相机的组成和测量原理,分析了物像空间对应的坐标关系,指出了影响大视场光电测量设备精度的原因是相机内方位元素的准确性和光学畸变校正效果。提出了基于像面坐标系在大地坐标系下投影的高精度CCD拼接相机内方位元素的标定方法,该方法建立了CCD拼接相机模型和光学畸变校正模型,使用多元回归分析方法,标定了相机的内方位元素与畸变系数。大量试验结果验证了该标定方法的正确性,该方法对其他光电测量设备具有参考价值。

Components and working principles of a wide view filed, multiple CCD camera are introduced. The coordinate relationship between the object and the image is analyzed systematically, and it is pointed that the reason which infects the precision are accuracy of camera inside azimuth element and the adjustment of optical distortion. Calibration method based on the projection of pixel coordinates on earth coordinates for high-precision CCD cameras＇ inside azimuth element is proposed. This method creates model multiple CCD camera and optical distortion adjustment. The camera inside azimuth element and coefficient of optical distortion are work out by multiple element analysis method. The correctness of this calibration method, the camera mode and distortion mode are affirmed by tests. This method is suitable for other optical electronic measurement system.