摘要
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 method of extracting parameters of laser spot by 2-dimensional Hough transform based on chords properties was proposed. The basic step of the method was to draw a pair of chords in the circular spot edge image, the pair of chords were parallel to the two plane axis respectively and perpendicular each other. Based on the geometric relation.ship between the chord and the circular center radius, the spot center coordinate and radius were calculated. Search for all the edge points on the image and vote for the 2-dimentional center coordinate array, the parameter related to the maximum value was ,selected as the spot center coordinate. By filtering the l-dimensional radius histogram, the radius value was acquired. The experimental result demonstrates that, comparing with the traditional Hough transform, the proposed method is more efficient in time and space and it has better in real dynamic image analysis.
出处
《光学技术》
EI
CAS
CSCD
北大核心
2007年第3期441-443,共3页
Optical Technique
