基于机器视觉的接触轨几何参数测量方法
熊厚旺,陈建政
(西南交通大学 牵引动力国家重点实验室,四川 成都 610031)
摘要:针对现有地铁接触轨几何参数测量方法存在误差大、效率低的问题,提出一种基于机器视觉的接触轨几何参数测量方法。该方法结合双目视觉和结构光技术,通过将结构光投射到接触轨表面,得到结构光光条图像,提取光条中心线并与另一台相机的光条图像中心线匹配,得到光条中心在实际空间位置的信息,最后在中心线中提取测量位置特征点,以特征点坐标信息反映接触轨几何参数。以上述测量原理为基础设计了接触轨几何参数测量仪,并在试验中进行精度测试。试验结果表明,该测量仪在不同的距离下,测量精度能达到1 mm,同时具备良好的测量稳定性,能够满足实际现场的测量要求。
关键词:线结构光;机器视觉;接触轨
中图分类号:TP751.1 文献标志码:A doi:10.3969/j.issn.1006-0316.2021.09.003
文章编号:1006-0316 (2021) 09-0013-08
Measurement Method of Contact Rail Geometric Parameters Based on Machine Vision
XIONG Houwang,CHEN Jianzheng
( State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China )
Abstract:Aiming at the problems of large errors and low efficiency in the existing methods of measuring geometric parameters of subway contact rails, a method based on machine vision for measuring geometric parameters of contact rails was proposed. The method based on binocular vision and structured light technology, by using a structured light projected onto the rail surface, obtain structure light article images and to extract the center line of the light stripe and the other cameras in light of the center line of the image matching, the light article center location information in real space, and finally in the center line of feature points extraction measurement position, with a characteristic point coordinates information reflecting the contact rail geometric parameters. Based on the above principle, a contact rail geometric parameter measuring instrument is designed and its accuracy is tested in the experiment. The experimental results show that the measurement accuracy of the instrument can reach 1mm at different distances, and it has good measurement stability, which can meet the actual on-site measurement requirements.
Key words:linear structured light;machine vision;contact rail
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收稿日期:2021-03-17
基金项目:科技部常规性科技援助项目(KY201701001)
作者简介:熊厚旺(1996-),男,江西奉新人,硕士研究生,主要研究方向为机车车辆故障诊断与安全监测,E-mail:houwangx96@163.com;陈建政(1968-),男,四川遂宁人,博士,研究员、硕导,主要研究方向为机车车辆动态检测技术与数据处理。
 

 

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