变形测量系统中激光光斑中心精确定位算法  

Precise center location algorithm for laser spot in distortion measuring system

作　　者：王志乾[1] 刘兆蓉[1,2] 赵雁[1] 李建荣[1,2] 刘畅[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院研究生院,北京100039

出　　处：《电子测量与仪器学报》2011年第6期485-489,共5页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(编号:60507003)资助项目;吉林省自然科学基金(编号:201115124)资助项目

摘　　要：针对变形测量系统中激光光斑中心精确定位的要求,在重心法的基础上,提出了基于重心法的曲线拟合亚像素定位算法。该算法首先用变结构元多尺度广义形态滤波算法滤除图像噪声,然后用重心法计算出激光光斑的亚像素位置,最后用曲线拟合对激光光斑的中心位置进行精确定位。根据变形测量原理,搭建了实验平台,通过多次实验,变形角的标准差均小于20″。实验结果表明,该算法能有效地提高变形测量系统的测量精度。The barycentric sub-pixel location algorithm of curve fitting is proposed to meet the requirements of pre-cise laser spot center positioning in distortion measurement system.First,the multi-scale generalized morphological fil-tering algorithm of variable structure element is used to filter image noise.Then,the sub-pixel position of laser spot is calculated in barycenter algorithm.Finally,curve fitting is used to locate the laser spot center precisely.The experimental platform is set up according to the distortion measurement principle.With many experiments,standard deviation of distor-tion angle is less than 20＂.The experiment results show that the location algorithm can improve distortion measurement accuracy effectively.

关 键 词：变形测量 亚像素定位 变结构元多尺度形态滤波 重心法 曲线拟合 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]