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Determining a pixel classification threshold for vehicle occupancy detection

  • US 9,202,118 B2
  • Filed: 12/13/2011
  • Issued: 12/01/2015
  • Est. Priority Date: 12/13/2011
  • Status: Active Grant
First Claim
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1. A method for determining a threshold for pixel classification in a vehicle occupancy detection system, the method comprising:

  • receiving an IR image of a moving vehicle intended to be analyzed for passenger occupancy in the vehicle, said image having been captured using a multi-band IR imaging system comprising an IR detector and an IR Illuminator, said imaging system having collected intensity values for each pixel in said image;

    detecting pixels of human tissue of a driver of said vehicle in said IR image; and

    using multi-spectral information of said detected human tissue pixels to determine a pixel classification threshold Cth comprising;


    Cth=Cm

    β

    V
    c,where Cm is a mean of correlation coefficient values of pixels of said driver'"'"'s detected face, Vc is a variance of said correlation, and β

    is a constant.

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