A constraint based real-time license plate recognition system

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Date

2007

Author

Günaydın, Ali Gökay

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License Plate Recognition (LPR) systems are frequently utilized in various access controls and security applications. In this thesis, an experimental constraint based real-time License Plate Recognition system is designed, and implemented in Java platform. Many of the available constraint based methods worked under strict restrictions such as plate color, fixed illumination and designated routes, whereas, only the license plate geometry and format constraints are used in this developed system. These constraints are built on top of the current Turkish license plate regulations. The plate localization algorithm is based on vertical edge features where constraints are used to filter out non-text regions. Vertical and horizontal projections are used for character segmentation and Multi Layered Perceptron (MLP) based Optical Character Recognition (OCR) module has been implemented for character identification. The extracted license plate characters are validated against possible license plate formats during the recognition process. The system is tested both with Turkish and foreign license plate images including various plate orientation, image quality and size. An accuracy of 92% is achieved for license plate localization and %88 for character segmentation and recognition.

Subject Keywords

EComputer Engineering., Computer Hardware.

URI

http://etd.lib.metu.edu.tr/upload/12608195/index.pdf
https://hdl.handle.net/11511/16674

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. G. Günaydın, “A constraint based real-time license plate recognition system,” M.S. - Master of Science, Middle East Technical University, 2007.