机载摄像机快速标定技术研究

针对飞行试验机载摄像机的标定,提出了一种基于光束法平差的高精度像机标定方法。首先,通过在测试目标周围放置带有编码标志点的标定板,拍摄其多种状态,经图像处理,获取标志点的编码以及中心坐标。然后通过相对定向、绝对定向、三维重建、捆绑调整,以及加入标志点之间的距离约束,得到数字摄像机内外方位元素和镜头畸变差参数,实现机载摄像机快速标定。实验结果表明：该标定方法不需要做高精度的现场控制点,重投影误差小于1cm,标定精度满足飞行试验测试要求。

The Reseach of Airborne Camera quickly Calibration Technology

An accurate calibration method based on bundle adjustment for the airborne camera in flight test is presented. Firstly, place the calibration tool with coded and non-coded marks around the test target and take photographs from different angles, the mark-numbers and center coordinates can be obtained by image processing. Then, the camera parameters which are included internal orientation elements, external orientation elements, lens distortion parametersSand differentialSparameters can be solved thought Srelative orientation,SabsoluteSdirectional,3D reconstruction ,bundledSadjustment and the distance constraintSbetween two marks .After all that the calibration parametersScan be achieved quickly and accurately. The experiment results show that the proposed methodSin this paperSdoSnot requireShigh-precision live control points and can offer a considerable accuracy in a re-projection error less than 1cm which can satisfy the demands in flight test for precision.