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Method of vehicle identification and a system for vehicle identification

  • US 9,396,403 B2
  • Filed: 12/31/2012
  • Issued: 07/19/2016
  • Est. Priority Date: 12/31/2012
  • Status: Expired due to Fees
First Claim
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1. A computer implemented method for vehicle type identification to determine at least one vehicle characteristic, the method comprising:

  • obtaining an input image of the vehicle from an image source connected to a motion sensor and configured to be triggered the motion sensor;

    converting the input image of the vehicle by a processor of a normalization unit to a normalized image by;

    reading normalization attributes (znorm, anorm, vnorm) from a unit for calibration of normalization attributes;

    detecting a registration plate area within the input image processing the input image basing on normalization attributes defining at least one scaling coefficient (znorm, anorm, vnorm);

    choosing from the sealed image a RoI area of a normalized size and location dependent on the location of the registration plate area; and

    , presenting data from the RoI area as a normalized image;

    performing by a processor of a parameterization unit a smoothing filtration of the normalized image to obtain a smoothed image (Ii);

    determining oriented gradient images (Oi,j) of brightness change for the smoothed image (h) in different directions (j);

    dividing the oriented gradient images (Oi,j) into blocks (Bi,j,n);

    determining a column vector (vi,n) having R dimensions and defined as
    vi,n=[∇

    (Bi,0,n), . . . ,∇

    (Bi,j,n)]reducing dimension of the column vector (vi,n) by left multiplication by a casting matrix Pi,n having S dimensions, wherein S is lower than R to obtain a column vector c(I)i,n defined as;


    c(I)i,n=Pi,n*vi,n providing the column vector c as the output of the parameterisation unit describing parameters of the normalized image;

    and determining the vehicle characteristic by a processor of a classification unit by comparing the parameters of a normalized image with parameters of reference images obtained from a reference database.

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