A system for the recognition of car license plates is presented. The aim of the system is to read automatically the Italian license number of a car passing through a tollgate. A CCTV camera and a frame grabber card are used to acquire a rear-view image of the vehicle. The recognition process consists of three main phases. First, a segmentation phase locates the license plate within the image. Then, a procedure based upon feature projection estimates some image parameters needed to normalize the license plate characters. Finally, the character recognizer extracts some feature points and uses template matching operators to get a robust solution under multiple acquisition conditions. A test has been done on more than three thousand real images acquired under different weather and illumination conditions, thus obtaining a recognition rate close to 91%.


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    Title :

    Optical recognition of motor vehicle license plates


    Additional title:

    Optische Erkennung der Nummernschilder von Kraftfahrzeugen


    Contributors:
    Comelli, P. (author) / Ferragina, P. (author) / Granieri, M.N. (author) / Stabile, F. (author)

    Published in:

    Publication date :

    1995


    Size :

    10 Seiten, 13 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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