摘要
从光学测量角度出发,结合计算机主动视觉中的相机标定方法及数字图像处理技术,提出了一种CCD摄像系统畸变校正方法。该法通过使用经纬仪,不需相机做任何运动就能实现全过程的标定。该方法在摄像机模型中全面考虑了镜头的径向畸变,利用图像中心附近点畸变量较小的性质,用中心附近点和全场视点对摄像机内部参数和像差修正参数进行标定,最后由最小二乘法得到摄像系统畸变模型的畸变系数,解决了CCD摄像系统的畸变校正问题。与传统的相机标定不同,畸变校正中仅标定数字图像中像素间距和相机焦距。该法运用了亚像素细分算法,提高了测试系统的精度,是一种简单、有效、实用的标定法。
According to the principle of optical measurement,an effective and simple method to measure the distortion of CCD camera and lens is presented in this paper.The method is based on computer active vision and image processing technology.The radial distortion of camera lens is considered in the method,while the camera parameters such as the pixel interval and focus of camera are calibrated.The optoelectronic is used in the experiment system.The light spot can image in CCD camera through the parallel optical tube.The position of the light spot should be changed without the camera’s rotation,while the optoelectronic theodolite rotates an angle.All view reference points in the image are computed by the points near the image centre where the distortion can be ignored.The error correction parameters are computed,and then the camera parameters are calibrated.The sub-pixel subdivision method is used to improve the point detection precision in our method.The experiment result shows that our method is effective,simple and practical.
出处
《红外与激光工程》
EI
CSCD
北大核心
2007年第z1期561-565,共5页
Infrared and Laser Engineering
关键词
相机标定
主动视觉
亚像素
最小二乘法
畸变
Camera calibration
Distortion correction
Active vision
Subdivision
