Optical Review

, Volume 22, Issue 4, pp 669–678 | Cite as

Multi-scaled license plate detection based on the label-moveable maximal MSER clique

  • Qin Gu
  • Jianyu Yang
  • Lingjiang Kong
  • Guolong Cui
Regular Paper


In this paper, we consider a robust vehicle license plate detection problem for intelligent transportation systems in the presence of various illumination situations. We propose a robust and fast multi-scaled license plate detection and location algorithm, which exploits a Label-Moveable Maximal MSER clique. Specifically, first, we extract the candidate character regions using the Maximally Stable Extremal Region (MSER) features. Second, we divide each candidate character region into four types and extract the suspected initial node (the top-left character) based on its neighbor MSER distribution characteristic. Third, we label each candidate character region to accomplish license detection and location based on the detected suspected initial node and the corresponding label-moveable maximal MSER clique. The robust of license plate detection, the accuracy of character labeling for license location, and the improvement of calculation efficiency are evaluated via the real data.


Intelligent transportation system License detection Maximally stable extremal region 


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Copyright information

© The Optical Society of Japan 2015

Authors and Affiliations

  • Qin Gu
    • 1
  • Jianyu Yang
    • 1
  • Lingjiang Kong
    • 1
  • Guolong Cui
    • 1
  1. 1.University of Electronic Science and Technology of ChinaWest Hi-tech ZoneChina

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