Volume 9 Issue 4
Jul.  2016
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GAO Li-zhen, LIU Shu-gui, HAN Zhen-hua. Corner extraction and matching location of parts[J]. Chinese Optics, 2016, 9(4): 397-404. doi: 10.3788/CO.20160904.0397
Citation: GAO Li-zhen, LIU Shu-gui, HAN Zhen-hua. Corner extraction and matching location of parts[J]. Chinese Optics, 2016, 9(4): 397-404. doi: 10.3788/CO.20160904.0397

Corner extraction and matching location of parts

doi: 10.3788/CO.20160904.0397
Funds:

Key Project of Natural Science Foundation of Tianjin City No.13JCZDJC34500

More Information
  • Corresponding author: E-mail:sgliu@tju.edu.cn
  • Received Date: 05 Apr 2016
  • Rev Recd Date: 26 Apr 2016
  • Publish Date: 01 Aug 2016
  • In this paper, a set of visual inspection system is designed based on three coordinate measuring machine(CMM), and the new visual system can extract the actual spatial feature information of the parts. For the parts with corner which is on the platform of CMM, the Harris operator is used to extract corners in the images obtained from three different orientation of the CMM. For the corner points extracted by the Harris operator, this paper proposes a method of eliminating the false corners, which combines eight-chain-code false corner search method and SUSAN method. Finally, based on the principle of stereo vision, the "Distance spatial map" matching algorithm is put forward, and then the three images are matched one by one. Although the position and orientation of parts are changed for many times in the experiment, the experiment results show that there are 1-2 pixels difference between extracted corners and the real corner points, and the position error of parts is 1-3 mm. Through the experiment, the accuracy and stability of corner matching and positioning can meet the requirements, and with anti-interference and practicability as well as.

     

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