Automatic license plate detection and character extraction with adaptive threshold and projections

  • Authors:

  • Daniel González Balderrama;Osslan Osiris Vergara Villegas;Humberto De Jesús Ochoa Domínguez;Vianey Guadaupe Cruz Sánchez

  • Affiliations:

  • Industrial and Manufacturing Engineering Department, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez, Chihuahua, Mexico;Industrial and Manufacturing Engineering Department, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez, Chihuahua, Mexico;Electrical and Computer Engineering Department, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez, Chihuahua, Mexico;Computer Science Department, Centro Nacional de Investigación y Desarrollo Tecnológico, Cuernavaca, Morelos, Mexico

  • Venue:
  • CSECS'08 Proceedings of the 7th conference on Circuits, systems, electronics, control and signal processing
  • Year:
  • 2008

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Abstract

License plate detection is very important for several applications. Especially for security, like parking control. In this paper, we show the design of a novel system to detect vehicular plates and to extract the characters contained in it. The phase of plate detection was made in two stages: the rectangular perimeter detection and the finding of a pattern by pattern matching. After detection of the plate the characters contained in it are segmented by using an adaptive threshold and vertical and horizontal projections. The tests were made in an uncontrolled environment in a parking lot and using Mexican and American plates. The results show that the system is robust as compare to those reported in the literature.