摘要
根据无衍射光斑特性提出一种定中算法.对光斑进行圆环滤波,求取单个圆环上的光强度平均值及其光强度差绝对值之和Q(r),确定多个圆环Q(r)的总和为目标函数,利用单纯形搜索算法,以搜索目标函数最小值来确定光斑中心点,并进一步优化算法,只选取几个圆环代替全平面的圆环滤波来求取目标函数.结果表明,定中算法的平均时间小于0.21 s,定位精度达到0.1个像素.
Considering that non-diffracting beam is composed of a series of concentric circles, a center detection algorithm was proposed using all the information of the beam. This algorithm firstly calculates the average light intensity in a circle, secondly figures out the sum of the absolute value of light intensity difference Q（r） in this circle, then identifies the sum of Q（r） in all the circles as the objective function, so the center point is determined through the search of the minimum value of the objective function using Nelder-Mead simplex method. Furthermore, this algorithm is optimized, using several circles instead of all circles to calculate the objective function. The experimental results show that the average time of this algorithm is less than 210 ms and the positioning accuracy can reach 0.1 pixel.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2010年第1期106-110,共5页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(30470489)
国家重点基础研究发展规划(973)资助项目(2007CB714005)
关键词
无衍射光
圆环滤波
亚像素
non-diffracting beam ring filtering sub-pixel
