Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (4): 19-23.

• Traffic & Transportation Engineering • Previous Articles     Next Articles

Locating of License Plate Based on Character Corner Information

Qin Zhong  Xu Jian-rain  Shi Sheng-li  Huang Hai-ying   

  1. College of Traffic and Communications,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-06-13 Online:2006-04-25 Published:2006-04-25
  • Contact: 秦钟(1972-)，男，博士生，主要从事智能交通、视频检测研究. E-mail:qzscut@yahoo.tom.cn
  • About author:秦钟(1972-)，男，博士生，主要从事智能交通、视频检测研究.
  • Supported by:

    国家自然科学基金资助项目(50578064 )；广东省科技攻关项目(2005A10101001)

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Abstract:

A method for locating the license plate with high speed and great accuracy is put forward for the license plate recognition.In the locating process,a system of three-level thresholds,ranging from roughness to fineness,is adopted to eliminate a number of non-comer pixels first,which speeds up the locating of the plate corners.Then,a big comer detection threshold is used to foreground the comers in the license plate region,and a slid window is
used to approximately detect the license plate.Finally,the detected plate is accurately located using a smaller cor-her detection threshold.Experimental results show that,by the proposed method,the locating accuracy is rated at 98% and the time cost is reduced to about 20 ms.

Key words: license plate locating, license plate recognition, comer detection, character comer, corner distribution feature