In order to recognize vehicle license numbers in real time, a CCD (charge-coupled device) camera with electronic shutter and a hierarchical computer system with a general-purpose microprocessor and pipelined image processors have been developed. Much quicker extraction of the vehicle-license plate on the front-view image is realized by optimization of parameters using Taguchi's method. Distinct images outdoors can be obtained using a suitable control of the lens-diaphragm and continuous lighting via floodlight equipment. The results of field tests show that recognition rates of about 90% in the daytime and about 65% at night were attained. The processing time per vehicle is about 150 ms on average.


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    Title :

    Development of vehicle-license number recognition system using real-time image processing and its application to travel-time measurement


    Additional title:

    Entwicklung eines Systems zur Erkennung von Fahrzeuggenehmigungen durch Echtzeit-Bildverarbeitung und die Anwendung für Reisezeitmessungen


    Contributors:
    Kanayama, K. (author) / Fujikawa, Y. (author) / Fujimoto, K. (author) / Horino, M. (author)


    Publication date :

    1991


    Size :

    7 Seiten, 5 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






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