弹落点坐标测量系统的快速校准方法及精度分析

针对弹落点坐标测量系统的使用环境及精度要求,提出了一种仅对焦距及光轴水平偏角进行现场校准的相机参数快速获取方法。通过分析坐标解算模型,得出线性的校准方程,利用测量区域内两个坐标已知点(靶标),多个视觉传感器可一次完成校准。通过精度分析给出了该方法下最优的靶标摆放位置。该方法具有校准速度快,精度较高,实用和算法性能分析容易等优点,适用于远距离、大范围视觉坐标测量中相机参数的获取,尤其是野外坐标测量。实际应用中, 在1 200 m外对直径400 m靶区进行监测时,该方法可保证区内各点的坐标测量误差均小于0.3 m。

A high speed camera calibration method in coordinate measurement of bomb-fall and its precision analysis

For the application environment and the necessary precision in vision coordinate measurement of bomb-fall,a corresponding method was proposed which just calibrate two key camera parameters: the focal length and the horizontal angle of the optical axis.By analyzing the coordinate calculation model,a linear calibration equation was presented,in which multiple vision sensors can derive their parameters at one time when getting two known coordinate points(target).Through analysis of precision,the optimum location of the target was given.The total errors were synthesized and the theoretical error values were obtained on every point in the measuring area.At last,the experimental results were given.The results show that the method is practical and simple for algorithm analysis,and is suitable for wide-range vision measurement,especially for field application.In the application of inspecting a f400 m area from 1 200 m away,the method can ensure that the coordinate measuring error is less than 0.3 m.