高抗振性大口径钢管动态直径测量系统  

Active Anti-vibration System for Measuring Diameter of Steel Pipe

作　　者：肖鹏[1] 刘文耀[1] 裘稀石[1] 王晋疆[1] 聂凯[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《光电工程》2012年第1期40-47,共8页Opto-Electronic Engineering

摘　　要：针对目前各大行业对钢管直径在线测量精度的需求,设计提出了一种基于亚像素的双CCD测量钢管直径的系统方法。该系统利用双CCD横向拍摄钢管,利用摄像机标定确定钢管、相机及其他相关设备的相对坐标,以及测量系统的内、外参数,对两相机采集到的图像利用差分法确定大致边缘区域,利用边缘区域亚像素边缘检测方法确定精确钢管边缘。根据得到的坐标值做外接四边形,采用最小二乘法求其内切圆的圆心坐标(即钢管的圆心坐标),最终确定钢管的直径。实验结果表明:本文直径测量方法抗振性能强、精度高,钢管直径的精度误差≤0.2%。利用亚像素方法的钢管直径测量技术,测量精度高,抗振性能强,适用于工业高速在线测量。According to the demand of diameter pipe-line accuracy measurement in the major industry currently,a measure system based on theory of sub-pixel and two CCD-cameras is designed.The system horizontally shoots the steel pipe by two CCD-cameras and determines the location of the steel pipe,cameras,related equipment and the external-inner of measurement system by cameras calibration method.It determines roughly edge areas of the image in two CCD-cameras by the method of differential and determines accurate edge of pipe-line by points in the roughly edge areas in sub-pixel measure method.According to the coordinate attained,external quadrilateral is formed and least squares are used to find the center of the inscribed circle（the center of steel tube） after the diameter is attained.Experimental results indicate that the accuracy of steel pipe diameter is improved,and the accuracy of steel pipe diameter error is below 0.2 percent.According to the research of measurement of steel pipe based on theory of sub-pixel,the system has simple structure,strong resistance to vibration performance and high accuracy,which is applied to industrial high-speed on line detection.

关 键 词：亚像素 大致边缘区域 角点坐标 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]