基于光束法平差的双线阵系统标定技术

A calibration technique for two linear array system based on beam method adjustment

摘要:

针对线阵相机特殊使用场景中所需要的高精度图像，对线阵相机进行高精度标定。提出一种基于光束法平差的双线阵相机标定方法。通过背景差分法获取线阵相机的特征点的像素坐标。再利用已有的直接线性变换方法和非线性优化方法求出相机的内参，外参，畸变参数后，将得到的初始参数与世界坐标作为待优化集合，利用LM法和光束法平差对该集合进行更进一步的优化，使得双线阵系统的重投影误差降到最低。实验表明，该方法与传统的线阵相机标定方法相比重投影误差降低了75.01%。

Abstract:

Aiming at the high precision image needed in the special application scene of linear array camera, the linear array camera is calibrated with high precision. Propose a calibration method for dual line array cameras based on beam adjustment.Pixel coordinates of feature points of linear array camera are obtained by background difference method.By using the existing direct linear transformation method and nonlinear optimization method, the internal parameters, external parameters and distortion parameters of the camera are obtained, and the initial parameters and world coordinates are taken as the set to be optimized. The LM method and the beam method are used to further optimize the set, so that the reprojection error of the two-linear array system is minimized.Experiments show that this method reduces the reprojection error compared with the traditional linear array camera calibration method.