大视场电视经纬仪摄像系统的标定研究

Calibration of Camera System of TV Theodolite

利用电视经纬仪的跟踪测量功能,以平行光管作为目标,实现了对摄像系统重要参量的精密测量.结合高准确度轴角编码器,可以对焦距进行标定.通过方位和俯仰方向的角位移,利用镜头畸变的轴对称性,可以确定光轴的位置.对整个视场进行抽样采点,得到一个畸变的网格场,通过拟合得到畸变系数,可以进行高准确度畸变修正.

The important parameters of camera system of TV theodolite have gotten with itself azimuth and pitching angle measure function. Camera focus can be measured through changing a little angle with constant target. Image center was gotten through comparing distances of target points in image because of symmetry of lens distortion. Through moving azimuth and pitching angle a distortion net of whole image was built. Then distortion model was set up with different models.