一种新的相机外参数标定方法

A New Calibrating Method of Camera External Parameters

摘要:

为了更精确地对飞机姿态进行交会测量, 提出了一种新的外参数标定装置来获得相机参数。首先通过高精度全站仪获得标定杆上圆形标记点在世界基准坐标系下的坐标, 然后通过摄像测量仪采集标定杆图像, 对其进行高精度椭圆拟合得到标记点在像素坐标系下的坐标, 在已知相机内参数的情况下求解世界基准坐标系到相机坐标系的旋转矩阵和平移向量。已知距离标记点验证实验结果表明: 相邻点间平均距离误差为0.1288mm, 具有较好的易操作性和标定精度。

Abstract:

In order to make more accurate intersection measurement on aircraft attitude, a new calibrating device of external parameters is proposed to obtain the parameters of the camera. Firstly, the coordinates of the circular markers in the world coordinate system can be obtained by high-precision total station. Secondly, after getting the bar’s image by the photographic measuring instrument, the coordinates of the circular markers in the image coordinate system can be computed by high precision ellipse fitting. And then, the rotational matrix and translation vector between the world coordinate system and the image coordinate system can be computed in case of camera intrinsic parameters. The verification experiment shows that the average distance error between adjacent points is 0.1288mm.