发动机缸体视觉图像定位方法研究  

Study on positioning method of engine cylinder based on vision image

作　　者：段红旭[1] 石永强[1] 王宝光[1] 王鹏[1] 孙长库[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《仪器仪表学报》2012年第3期643-648,共6页Chinese Journal of Scientific Instrument

基　　金："高档数控机床与基础制造装备"科技重大专项(2009ZX04014-092)资助项目

摘　　要：针对发动机缸体孔系实现在线自动测量的难题,提出了基于视觉图像的发动机缸体定位方法。通过面阵CCD获取发动机缸体定位销孔图像信息,利用图像处理提取定位销孔中心位置,以此建立每个被测缸体的测量基准。使用环形双峰阈值法与中值滤波对图像进行预处理,有效地解决了定位销孔具有倒角影响图像边缘提取精度的问题。为验证此定位方法的准确性与可行性,分别进行了发动机缸体定位孔直径与位置度重复性测量与发动机缸体上表面孔组直径与位置度重复性测量实验。实验结果表明所提出的视觉定位方法稳定可靠,实现了发动机缸体的快速、精确定位,为实现发动机缸体的在线检测打下了可靠基础。Aiming at the problem of automatic on-line measurement of engine cylinder,this paper studies an engine cylinder vision image positioning method based on vision image.In order to establish measurement baseline for each engine cylinder under test,an area CCD is used to obtain the engine cylinder pinhole information and extract the pinhole center through image processing.Considering the problem that the pinhole chamfer affects the image edge detection precision,ring-two-peak threshold method and median filtering method are adopted to preprocess the image.Pinhole diameter and position measurement experiment and engine cylinder joint surface hole diameter and position measurement experiment were carried out to verify the accuracy and feasibility of the positioning method.Experiment results show that the proposed method based on vision image is stable and reliable,high precision positioning of engine cylinder is achieved,which makes a solid foundation for engine cylinder automatic online measurement.

关 键 词：视觉图像定位 发动机缸体 定位基准 图像处理 标定靶标 

分 类 号：TP242.6[自动化与计算机技术—检测技术与自动化装置]