本文以CCD摄像机小孔成像模型为基础建立了薄棱镜畸变的非线性几何畸变模型,通过对影响畸变参数测量精度的各种因素的分析,使用最小二乘法解线性方程组得到摄像机系统畸变模型的畸变系数。通过与径向畸变相对比得出薄棱镜畸变对摄像机标定的影响相对较小,在此基础上提出了提高标定精度的有效方案。

In the imaging system,the calibration of nonlinear geometric distortion is still a problem. Based on the distortion model in which the radial geometric distortion is considered as the chief factor,a general correcting method that is independent of interior parameters of the imaging system,is given and discussed in this paper via a detailed analysis of the factors which largely influence the accurate measurement of distortion parameters. The main contents of this paper are described as following: camera distortion and the simplified camera model are discussed。Linear distortion model was used and the distortion coefficients were obtained by resovling over-determined linear equations and least square method. The prism distortion draw on the impact of camera calibration is small relative with radial distortion then we presented an effective program to improve the calibration accuracy.