机载摄像机快速标定技术研究

Reseach of Airborne Camera Quickly Calibration Technology

摘要:

为了实现飞行试验中机载摄像机的快速标定,提出了一种基于光束法平差的高精度标定方法;该方法通过在被测试目标周围放置带有编码标志点的标定板,拍摄其多角度序列影像,经过相对定向、绝对定向、三维重建、捆绑调整,以及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系数,实现机载摄像机快速标定;实验结果表明:该标定方法重投影误差小于1 cm,精度满足飞行试验测试要求,同时操作方便,适用于多场地试飞,具有鲜明的工程应用价值。

Abstract:

In order to achieve the quickly Calibration for airborne camera in flight test, an accurate calibration method based on bundle adjustment is presented. By place the calibration tool with coded and non-coded marks around the test target and take photographs from different angles. Then, the camera parameters which are included internal orientation elements, external orientation elements, lens distortion parameters and differential parameters can be quickly and accurately solved through relative orientation, absolute directional, 3D reconstruction, bundled adjustment and the distance constraint between two marks.The experiment results show that the proposed method in this paper can offer a considerable accuracy in a re-projection error less than 1cm which can satisfy the demands in flight test for precision. At the same time, it is easy to operate, suitable for more distinct sites flight test and with distinctive value for engineering application.