Matrics, a Car License Plate Recognition System

Authors:
Andrés Marzal;Juan Miguel Vilar;David Llorens;Vicente Palazón;Javier Martín
Affiliations:
Departament de Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló, Spain;Departament de Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló, Spain;Departament de Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló, Spain;Departament de Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló, Spain;Departament de Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló, Spain
Venue:
IbPRIA '07 Proceedings of the 3rd Iberian conference on Pattern Recognition and Image Analysis, Part I
Year:
2007

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Abstract

Matrics is a system for recognition of car license plates. It works on standard PC equipment with low-priced capture devices and achieves real-time performance (10 frames per second) with state of the art accuracy: the character error rate is below 1% and the plate error rate is below 3%. The recognition process is divided in two phases: plate localization and plate decoding. The system finds the plate analyzing the connected components of the image after binarization. The decoding algorithm is a Two Level process which uses fast template-based classification techniques in its first stage and optimal segmentation in the second stage. On the whole, the system represents a significant improvement over a previous version which was based on HMM.