Apparatus for measuring the dynamic state of traffic

  • US 5,301,239 A
  • Filed: 02/03/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 02/18/1991
  • Status: Expired due to Fees
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First Claim
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1. An apparatus for measuring the dynamic state of traffic, comprising:

  • video camera means for picking up images of vehicles moving on a road and producing picture data in the form of electrical signals;

    an analog to digital (A/D) converter, connected to said video camera means, for converting said picture data from said video camera means into digital picture data;

    input image memory means, connected to said A/D converter, for temporarily storing said digital picture data;

    background data memory means, connected to said A/D converter, for storing background data indicative of the road without any vehicles on it;

    image processing means, connected to said input image memory means and said background data memory means, for processing the data stored in said input image memory means and said background data memory means, said image processing means including means for judging the state of the road to determine whether a running vehicle is present and to determine whether a standing vehicle is present if a running vehicle is not present, said means for judging the state of the road includingmeans for obtaining an average luminance value of current picture data and a most-frequent luminance value of current picture data from the digital picture data stored in said input image memory means,means for obtaining an average luminance value and a most-frequent luminance value of the background data from the background data stored in said background data memory means,means for comparing the average luminance value of the current picture data and the average luminance value of the background data, andmeans for comparing the most-frequent luminance value of the current picture data and the most-frequent luminance value of the background data; and

    output means, connected to said image processing means, for outputting the result of the judgement.

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