基于新型靶的CCD摄像系统畸变测量与校正

深入研究了测试图案对测量畸变的影响。提出"一靶测试法"进行畸变测量与校正,拍摄了自行设计、制作的"综合点阵靶板"的畸变图像,图像处理得到其畸变点位置,并与理想点位置进行对应比较。建立多项式模型确定畸变点与理想点的位置校正关系,理想点位置由理想成像得到,并运用最小二乘拟合算法求得多项式系数,标定整个CCD摄像系统的畸变。"综合点阵靶板"采用灰色圆点黑色间带图案,方便了点按序标记排列,从而确定畸变点与理想点的一一对应。对2.6 mm焦距的广角CCD镜头摄像系统进行了畸变测量与校正,其重复测量,校正精度达到0.3%。

Distortion Measurement and Calibration Technology for CCD Camera System Based on New Target Board

The influence of testing map on distortion measurement and calibration is extensively studied.A so called "one target distortion testing method" is presented for distortion measurement and calibration.The distorted image of the self-designed and fabricated "integrated spot array target board" is recorded.The position of distorted points is determined by image processing,and compared with the ideal points position.The position relation between distorted points and ideal points is established by polynomial model.The position of ideal points is obtained by ideal imaging.Then polynomial coefficients of the model are computed from the least squares method.While corresponding the distorted points to ideal points,the whole CCD camera system's distortion is calibrated.The integrated spot array target board consists of gray spots and black interval belts,and makes it convenient to mark the spots in sequence and correspond the distorted points to the ideal points.The distortion of wide-angle CCD camera system with focal length of 2.6 mm is repeatedly measured and calibrated,and the calibrating precision is within 0.3%.