双线阵CCD相机的畸变校正和标定方法

Camera calibration and lens distortion correction for binocular linear CCD

在双线阵CCD的三维重建中,对线阵CCD相机的标定和镜头畸变校正是基础环节。提出了一种用于三维重建中的双线阵CCD标定及镜头畸变校正方法。根据左右相机间的单应性关系,以及线阵CCD的成像原理,将双目相机间的空间关系分解成姿态角与错切角的关系。通过靶图数据的拟合,对姿态角和镜头畸变进行校正,根据求出的错切角完成相机间的标定,实现对具有镜头畸变的双线阵CCD的标定。实验结果表明,标定和校正精度满足后续三维重建中图像匹配的需求。

Camera calibration and lens distortion correction for linear CCD are the basic parts of 3D reconstruction with binocular linear CCD. An approach of calibration and lens distortion correction for binocular linear CCD used in 3D recon-struction is proposed. Based on the homography between left camera and right camera, and linear CCD imaging principle, spatial relationship between binocular camera is modeled as attitude angle and shear angle. By data fitting, the attitude angle and lens distortion are corrected, the shear angle is also computed to complete camera calibration. As to the analysis above, camera calibration and lens distortion correction are achieved. The experiment results show that the precision of calibration and correction could satisfy the need of image matching of 3D reconstruction in the future.