基于平面圆靶标的相机标定

Camera calibration method based on planar pattern

本文采用平面靶标的标定方法研究了平面圆靶标的相机标定。在标定过程中,考虑了透镜的径向畸变,首先对摄像机的内外参数用直接线性变换估算,然后应用Levenberg-Marquardt(L-M)非线性算法对所有参数进行优化。结果显示,相对误差的线性估算结果与L-M算法优化结果相比差别不大。因此,在实际标定中只需选择线性估算即可,其算法简单且能满足精度要求。

In this paper,using the method of camera calibration based on planar pattern,the camera calibration of planar circle pattern is studied.In the process of calibration,Lens＇ radial distortion is considered. First,the initial camera parameter values are estimated by the direct linear transformation（DLT）;then the parameter values are optimized by using Levenberg-Marquardt（L-M） non-linear method.The results show that,either the direct linear transformation or non-linear optimization,the relative errors of the parameters are almost uniform.So in the process of calibration,the direct linear transformation can be choosed because it can meet accuracy standard and its algorithm is simple.