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提出了一种利用弦的特性快速提取激光光斑参数的二维Hough变换方法。基本步骤是在圆形光斑边缘图像上作两条交于边缘上一点且相互垂直并分别平行于坐标轴的弦,通过这两条弦与光斑圆心及半径的几何关系,求取光斑的中心坐标和半径。遍历所有边缘点,对参数空间二维中心坐标数组投票,最大值对应参数即为光斑中心坐标。分析一维归一化半径直方图,求得光斑半径。实验结果表明,与传统的Hough变换相比,该算法在运行时间和空间效率上都有很大提高,具有更强的实用意义及应用前景。
A two-dimensional Hough transform method based on the character of chord is proposed to quickly extract laser spot parameters. The basic steps are to make two chords on the edge of the circular spot intersecting the coordinate point and perpendicular to each other and parallel to the coordinate axis. Based on the geometric relationship between the two chords and the center and radius of the spot, the center coordinates of the spot And radius. Traversing all edge points, voting on the array of two-dimensional center coordinates in the parameter space, the maximum corresponding parameter is the center coordinates of the spot. Analysis of one-dimensional normalized radius histogram, obtained spot radius. The experimental results show that compared with the traditional Hough transform, the proposed algorithm has greatly improved the running time and space efficiency, and has stronger practical significance and application prospect.