轨道车体底座面型测量中多LED关联点目标的数值提取方法  

Numerical Extraction Method of Multi-LED Correlation Point Targets in Surface Profile Measurement of Rail Vehicle Body Base

作　　者：梁雯雯 陈飞 张国旺 何平安[2] LIANGWen-wen;CHEN Fei;ZHANG Guo-wang;HE Ping-an(CRRC Nanjing Puzhen Co.,Ltd.,Nanjing 210031,China;Electronic Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]中车南京浦镇车辆有限公司,江苏南京210031 [2]武汉大学电子信息学院,湖北武汉430072

出　　处：《光学与光电技术》2022年第1期65-69,共5页Optics & Optoelectronic Technology

摘　　要：为了抵抗满载时的负载,轨道车辆制造时车体底座会保留一定向上的挠曲变形,这就要求在进行铝蜂窝板和地板胶铺设前对车体底座表面面型进行测量。提出了一种基于点状目标图像测量原理的车体底座面型测量方法,该方法用CMOS相机对车体底座上的4个LED目标进行图像测量,这4个LED形成关联多目标点。先对CMOS相机采集到的LED目标图像用均值滤波、动态阈值二值化处理和轮廓提取的方法进行预处理,再通过灰度质心法,提取出多个光斑的位置。通过判断各光斑的位置和大小,排除可能存在的伪目标点或遮拦,根据提取到的光斑数量的不同,采用不同的参考点进行比较。在任意一个LED目标被遮挡时,算法仍能有效地解出被测LED目标中心位置。实验结果表明,LED靶标中心提取的最大偏差小于0.06 mm,完全能满足车体底座面型测量的需求。In order to resist the load at full load,the car body base will retain a certain upward flexural deformation when the rail vehicle is manufactured.It requires the surface profile of the base to be measured before laying aluminum honeycomb panels and floor glue.A method for measuring the surface shape of the car body base based on the principle of point target image measurement is proposed.This method uses a CMOS camera to measure the 4 LED on the car body base,in which 4 LED form a correlation Multi-target points.the LED target image gathered by CMOS camera is preprocessed by means of mean filtering,dynamic threshold binarization and contour extraction,and then the gray-centroid method is used to extract the positions of multiple light spots.By judging the position and size of each light spot,possible false target points or obstructions are eliminated,and different reference points are used for comparison according to the number of extracted light spots.When any LED target is obstructed,the center position of the LED target can still be solved effectively.It is shown by the experimental results that the maximum deviation of the center extraction of the LED target is less than 0.06 mm,which can fully meet the needs of vehicle body base surface measurement.

关 键 词：车辆底座面型测量 LED目标 关联多目标点 光斑位置 灰度质心法 伪目标 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]