一种改进的摄像机线性标定优化方法

现有的摄像机标定方法没有将高精度和简便性很好的衔接在一起。提出一种新的标定优化方法。首先选择主点位置在图像中心，纵横比为1作为初始条件；接着利用改进的摄像机线性标定方法，得到在同一摄像机坐标系下不同图像上所有标定点的摄像机坐标；最后利用摄像机坐标系下的这些三维点来优化内、外参数。实验结果表明：本文提出的标定方法得到的焦距误差在0.1mm以内，主点位置的最大误差在2pixel左右，测试点的最大误差控制在0.5pixel以内。本文提出的标定方法是一种简单、高精度的标定方法。

Improved Camera Linear Calibration Optimization Method

At present,the commonly used camera calibration methods do not have a good convergence of high accuracy and simplicity. In view of this, this paper proposes a new method of calibration optimization. Considering the simplici-ty, the calibration method of this paper selects the position of principal point which is on the center of the image and aspect ratio which is 1 as the initial condition. Then we use improved camera linear calibration method to obtain all points’coordinates of different images in the same camera coordinate system;finally,using the 3D points in the cam-era coordinate system to optimize the internal and external parameters. The experimental results show that the focal length’s error was less than 0.1mm,the maximum error of the principal point’s position is about 2 pixel,the maxi-mum error of the test points is less than 0.5pixel and the calibration method which is proposed in this paper is a sim-ple and accurate calibration method.