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Extracting characters from real vehicle licence plates out-of-doors

Extracting characters from real vehicle licence plates out-of-doors

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  • Author(s): B.-F. Wu 1 ; S.-P. Lin 1 ; C.-C. Chiu 2
    • View affiliations
    • Affiliations: 1: Department of Electrical and Control Engineering, National Chiao Tung University, Taiwan, Republic of China
      2: Department of Electrical Engineering, Chung Cheng Institute of Technology, National Defense University, Taiwan, Republic of China
  • Source: Volume 1, Issue 1, March 2007, p. 2 – 10
    DOI:  10.1049/iet-cvi:20050132 , Print ISSN 1751-9632, Online ISSN 1751-9640
© The Institution of Engineering and Technology
Published

Most applications of automatic vehicle identification systems are outdoors and are consumer-orientated. The recognition rate, the system reliability and the processing speed are very important. A system for extracting characters from licence plates has been presented. The system can successfully extract characters from licence plates in any part of a captured image without the need to consider the luminance of the surroundings or the size and inclination of the licence plate or the colour of the vehicle. Moreover, the processing time of this system is satisfactory for several applications. The proposed system depends only on the completeness of a character and so is tolerant of skewed plates and complex backgrounds. In a real parking lot, an extraction rate of 95.6% was obtained by applying the system to 228 vehicles.

Inspec keywords: traffic engineering computing; image recognition; road vehicles; character recognition; feature extraction

Other keywords: skewed plates; recognition rate; system reliability; real vehicle licence plates; automatic vehicle identification systems; characters extraction

Subjects: Traffic engineering computing; Image recognition; Image recognition; Computer vision and image processing techniques

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