An Iranian license plate recognition system based on color features

Amir Hossein Ashtari, Md. Jan Nordin, Mahmood Fathy

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

In this paper, an Iranian vehicle license plate recognition system based on a new localization approach, which is modified to reflect the local context, is proposed, along with a hybrid classifier that recognizes license plate characters. The method presented here is based on a modified template-matching technique by the analysis of target color pixels to detect the location of a vehicle's license plate. A modified strip search enables localization of the standard color-geometric template utilized in Iran and several European countries. This approach uses periodic strip search to find the hue of each pixel on demand. In addition, when a group of target pixels is detected, it is analyzed to verify that its shape and aspect ratio match those of the standard license plate. In addition to being scale and rotation invariant, this method avoids time-consuming image algorithms and transformations for the whole image pixels, such as resizing and Hough, Fourier, and wavelet transforms, thereby cutting down the detection response time. License plate characters are recognized by a hybrid classifier that comprises a decision tree and a support vector machine with a homogeneous fifth-degree polynomial kernel. The performance detection rate and the overall system performance achieved are 96% and 94%, respectively.

Original languageEnglish
Article number6756998
Pages (from-to)1690-1705
Number of pages16
JournalIEEE Transactions on Intelligent Transportation Systems
Volume15
Issue number4
DOIs
Publication statusPublished - 2014

Fingerprint

Pixels
Color
Classifiers
Template matching
Hough transforms
Decision trees
Wavelet transforms
Support vector machines
Aspect ratio
Fourier transforms
Polynomials

Keywords

  • Color template matching
  • image recognition
  • license plate detection
  • license plate localization
  • license plate number identification
  • license plate recognition (LPR)

ASJC Scopus subject areas

  • Automotive Engineering
  • Computer Science Applications
  • Mechanical Engineering

Cite this

An Iranian license plate recognition system based on color features. / Ashtari, Amir Hossein; Nordin, Md. Jan; Fathy, Mahmood.

In: IEEE Transactions on Intelligent Transportation Systems, Vol. 15, No. 4, 6756998, 2014, p. 1690-1705.

Research output: Contribution to journalArticle

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