靶场光学镜头畸变校正方法研究

发布时间：2019-03-15 16:49

【摘要】：光学镜头畸变是影响靶场光学设备测试精度的一个重要因素,特别是短焦大视场情况下尤为显著。目前采用的修正方法虽然能起到一定的效果,但是其修正后的残留误差依然较大,不容忽视,为了消除其影响,提高设备测角精度,提出了局部区域最小二乘法和分形插值曲面法,并采用上述两种算法对光学镜头畸变校正进行研究。首先,将整个视场(40°×30°)以网格的方式进行划分,间隔1°,利用平行光管精确测量网格点的畸变值。局部区域最小二乘法是将测量点周围N×N网格点的畸变值作为观测值,组成系数矩阵,求取修正函数的系数,进而求出测量点位置的修正值;分形插值曲面法是将视场内所有网格点数据进行插值,获取测量点位置的修正值。算例结果表明:两种算法分别以局部和全局的方式进行校正,测角精度有明显提高,修正后精度可达10″,满足靶场试验的测试要求,对提高终点坐标测量精度起到了积极的作用。
[Abstract]:The distortion of optical lens is an important factor that affects the measuring accuracy of optical equipment in the shooting range, especially in the case of short focus and large field of view. Although the current correction method can play a certain role, but its residual error is still large, can not be ignored, in order to eliminate its impact, improve the accuracy of equipment angle measurement, The local region least square method and fractal interpolation surface method are proposed, and the optical lens distortion correction is studied by using the two algorithms mentioned above. First of all, the whole field of view (40 掳脳 30 掳) is divided into grids with a spacing of 1 掳. The distortion values of the grid points are accurately measured by a parallel light tube. The local region least square method takes the distortion value of the N 脳 N grid around the measurement point as the observation value, forms the coefficient matrix, obtains the coefficient of the correction function, and then obtains the correction value of the measurement point position. The fractal interpolation surface method is to interpolate all the grid point data in the field of view and obtain the correction value of the measured point position. The results of numerical examples show that the accuracy of angle measurement is improved obviously by the two algorithms in local and global ways, and the modified accuracy is up to 10 ", which meets the test requirements of range test. It plays a positive role in improving the accuracy of coordinate measurement at the end point.
【作者单位】：中国白城兵器试验中心;
【分类号】：TB851

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