大视场短焦距镜头CCD摄像系统的畸变校正  

Distortion measurement of CCD camera with a large-field, short focal length lens

作　　者：行麦玲[1] 刘贱平[1] 林家明[1] 沙定国[1] 苏大图[1] 

机构地区：[1]北京理工大学信息工程学院,北京100081

出　　处：《光学技术》2003年第3期377-379,共3页Optical Technique

摘　　要：从光学测量角度出发,结合计算机视觉中的摄像机标定方法,解决了大视场短焦距镜头CCD摄像系统的畸变校正问题。与摄像机标定不同,畸变校正中仅标定内部参数,外部参数作为已知条件。采用线性畸变模型,由最小二乘法解线性方程组得到摄像系统畸变模型的畸变系数。介绍了数字图像中像素间距和光学中心的标定方法。通过比较由标定参数得到的畸变图像和摄像机采集的畸变图像对实验标定精度进行评定,实验结果表明边缘视场(112°)的标定精度达到了0 75%。According to the principle of optical measurement, a simple and effective method to measure the distortion of CCD camera with a largefield, short focal length lens is presented. Different to camera calibration only intrinsic parameters were calibrated and extrinsic ones were provided. Linear distortion model was used and the distortion coefficients were obtained by resolving overdetermined linear equations and least square method. The method for getting onepixel width and optical center is introduced. The measurement accuracy was estimated by comparing the distortion image computed by calibration parameters with the distortion image captured by a largefield, short focal length lens camera. The result shows the calibration accuracy is within 0.75% at 112°field.

关 键 词：大视场 短焦距 CCD镜头 摄像系统 畸变校正 摄像机标定 

分 类 号：TN948.41[电子电信—信号与信息处理]