基于非标定摄像机的尺寸测量方法  

Size measurement method based on non-calibrated camera

作　　者：黄建斌[1] 姚滔[1] 刘家旺[1] 许桢英[1] 邹荣[1] Huang Jianbin Yao Tao Liu Jiawang Xu Zhenying Zou Rong(School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China)

机构地区：[1]江苏大学机械工程学院,镇江212013

出　　处：《电子测量技术》2017年第6期122-125,131,共5页Electronic Measurement Technology

摘　　要：针对小工件的非接触长度测量,提出了一种基于交比不变,利用非标定CCD摄像机与已知特征标记物进行小工件长度测量的新方法。利用摄像机对工件的图像信息进行远距离采集,建立测量模型,在对图像进行预处理的基础上行边缘识别,提取工件与已知特征标记物边缘特征,进而实现工件长度的在线测量,并与经标定摄像机的在线测量结果进行比较,结果表明,该测量方法操作简单,无需标定摄像机的同时适应性强,被测工件长度在0~500mm,测量误差低于0.4%。To get the size of small work pieces by non-contact means,a new method is proposed in this paper which is based on the invariance of cross ratio with non-calibrated CCD cameras.After the images of work pieces being remotely acquired by camera and preprocessed,edges as well as some other features of the work piece will be detected and extracted.According to two orthogonal sets of parallel line markers with known spacing on the measuring table,the size of the work piece is obtained.Experimental results indicate that this kind of method used in length measurement system has similar precision to the traditional techniques which first of all must have their cameras calibrated.At the same time it can be simply operated and adapted to various situations.The measured length of work pieces ranges from Omm to 500 mm and the measuring error is less than 0.4%.

关 键 词：CCD 长度测量 非标定 边缘提取 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置] TN06[自动化与计算机技术—控制科学与工程]