激光瞄靶训练系统中鱼眼图像的校正

Correction of Fisheye Image in Laser Target Shooting Training System

讨论了激光瞄靶训练系统中鱼眼图像的校正问题.根据胸环靶图像各环宽度相等的特性,使用最小二乘法拟合图像上各点到镜头光心的距离和无畸变距离之间的映射关系,实现了靶心与光心重合情况下鱼眼图像的校正和成绩判定方法.在靶心与光心非重合情况下,通过连接靶心与光心所在的直线,求出该直线与各环交点到光心的距离和无畸变距离,拟合新的映射关系.实验结果表明,校正后判定射击成绩精度达到0.1环.

A fisheye image correction method for laser target shooting training system is discussed in the paper. Because each ring in target image has the same width, the mapping relationship of the undistorted distance and the distance between optical center of lens and each point in the image is approximated by least square method. Fisheye image correction and scoring method are implemented when center of blank is located at optical center. In case of none overlapping, center of blank and optical center are connected with a straight line. The distance between optical center and intersection points of the straight line and each ring are measured, and the mapping relationship is approximated. Experimental results show that the proposed method provides satisfactory accuracy for shooting scores.