License plate recognition algorithm for passenger cars in Chinese residential areas

Lisheng Jin, Huacai Xian, Jing Bie, Yuqin Sun, Haijing Hou, Qingning Niu

Research output: Journal PublicationArticlepeer-review

33 Citations (Scopus)


This paper presents a solution for the license plate recognition problem in residential community administrations in China. License plate images are pre-processed through gradation, middle value filters and edge detection. In the license plate localization module the number of edge points, the length of license plate area and the number of each line of edge points are used for localization. In the recognition module, the paper applies a statistical character method combined with a structure character method to obtain the characters. In addition, more models and template library for the characters which have less difference between each other are built. A character classifier is designed and a fuzzy recognition method is proposed based on the fuzzy decision-making method. Experiments show that the recognition accuracy rate is up to 92%.

Original languageEnglish
Pages (from-to)8355-8370
Number of pages16
Issue number6
Publication statusPublished - Jun 2012
Externally publishedYes


  • Character
  • Character localization
  • Character segmentation
  • Image processing
  • License plate recognition

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering


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