×

METHOD OF VEHICLE IDENTIFICATION AND A SYSTEM FOR VEHICLE IDENTIFICATION

  • US 20150294174A1
  • Filed: 12/31/2012
  • Published: 10/15/2015
  • Est. Priority Date: 12/31/2012
  • Status: Active Grant
First Claim
Patent Images

1. A 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;

    normalization of the input image of the vehicle in a normalization unit to obtain 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 scaled 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;

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

    wherein;

    the parameters of normalized image are obtained in the parameterization unit by;

    performing 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 (Ii) 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·

    *v
    i,n providing the column vector c as the output of the parameterisation unit describing parameters of the normalized image.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×