光学精密工程2017，Vol.25Issue(7)：1961-1967,7.DOI:10.3788/OPE.20172507.1961
野外大视场单相机空间坐标测量系统的快速标定
Fast calibration for single camera space coordinate measuring system with large field of view
摘要
Abstract
In order to realize the high-precision and automatic measurement of space coordinate position for the bomb falling point in the wildly large field of view,the space coordinate measurement system of the single camera was established.Aiming at the large scope of on-site monitoring for shooting range,flexible focal distance of camera,different spatial position and angle of camera,a fast calibration method which was used in the wildly large field of view was proposed.Firstly,on the basis of the pinhole imaging model,taking advantages of the GPS measurement,two calibration points within the field of view and the coordinate of the camera in the geodetic coordinate system was obtained;and the pixel coordinate of calibration points were read;according to the equality of opposite angles and the least square method,the sub-step calibration of the focal distance and the rotation matrix was realized.On the premise of ensuring the calibration accuracy,the calibration process of the principal point was omitted;and the principle point of the camera was determined to be the ideal position for the principle point.The experimental result shows that beyond 1km of testing distance,at the time of monitoring the area with 200m width of field,the relative calibration error of the check point is lower than 0.25％.The camera calibration method does not need high-precision target,because it is easy to be operated and is applicable to fast calibration for the space coordinate measurement system of the single camera under the environment of the wildly large field of view.关键词
单目视觉/摄像机标定/快速标定/野外大视场Key words
monocular vision/camera calibration/fast calibration/large field of view分类
信息技术与安全科学引用本文复制引用
王向军,邓子贤,曹雨,刘峰..野外大视场单相机空间坐标测量系统的快速标定[J].光学精密工程,2017,25(7):1961-1967,7.基金项目
国家自然科学基金资助项目(No.51575388) （No.51575388）
