基于圆拟合的非完整圆激光光斑中心检测算法

摘要

为了确定非均匀、非完整圆小孔激光光斑的精确中心,提出一种基于圆拟合的非完整圆小孔激光光斑中心检测新方法.该方法通过灰度形态学算法对激光光斑进行阈值分割,从水平和垂直两个方向检测粗略的激光光斑边缘,利用边界生长法消除比较短的圆弧和孤立的边缘点,通过反复迭代拟合获得最佳的圆轮廓并拟合出最终的标准圆.实验结果表明本方法精度明显优于传统的大型激光装置自动准直系统中的重心法,完全满足了该系统中对于非均匀、非完整圆小孔激光光斑中心求取的精度要求.%In order to obtain precise center of asymmetrical and semicircular laser spot,a new method for semicircular laser spot center detection based on circle fitting was proposed.Threshold of laser spot image was segmented by morphology algorithm.Rough laser spot edge was detected in horizontal and vertical direction.Short arcs and isolated edges were deleted by contour growing.The best circle edge was acquired by iterative fitting and the final standard circle was fitted by the best circle edge.The result shows that the method is more accuracy and more automatic than method of gravity model being used in traditional large-scale laser facility of automatic alignment system.The accuracy of method to achieve asymmetrical and semicircular laser spot center meets the requirements of the system.