Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (4): 208-211.DOI: 10.3778/j.issn.1002-8331.2011.04.058

• 图形、图像、模式识别 • Previous Articles     Next Articles

Study on new image angle matching method and applications

WANG Heng,LIU Ran,XIE Xingzhe,ZHANG Hua   

  1. School of Information Engineering,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China
  • Received:2009-05-19 Revised:2009-07-03 Online:2011-02-01 Published:2011-02-01
  • Contact: WANG Heng


王 姮,刘 冉,解兴哲,张 华   

  1. 西南科技大学 信息工程学院,四川 绵阳 621010
  • 通讯作者: 王 姮

Abstract: A method for detecting multi-pads in PCB assembly line based on machine vision in real-time is proposed.Multi-resolution strategy is adopted to accelerate the matching speed.Circular projection matching method is used to get the initial candidate matching sub-images based on the gray properties of the template image and the searched image.And then,the mismatch sub-images are removed through the numbers of matching points between matching sub-image and template using SIFT feature matching method.A rough rotated angle is calculated through point pattern matching and the precise angle is gained through re-sampling and interpolation method.Experimental results show the robustness and validity of the proposed method,and can track objects in real-time.

Key words: circular projection matching, Scale Invariance Feature Transform(SIFT), multi-resolution, point pattern matching

摘要: 探讨了一种基于机器视觉的PCB自动装配线多焊盘实时定位方法。采用多分辨率图像金字塔匹配策略,利用模板图像与待搜索图像的灰度特性,使用圆投影匹配进行初始候选匹配点的选取,得到一系列的候选匹配子图;使用SIFT算法对候选匹配子图和模板图像进行特征匹配,确定对应匹配点,消除误匹配的候选子图;根据点的模式匹配,确定大致的旋转角度,使用重采样和插值的方法计算精确的旋转角度。实验表明,该方法可以准确、实时地实现目标定位。

关键词: 圆投影匹配, 尺度不变特征变换(SIFT), 多分辨率, 点模式匹配

CLC Number: