Traffic congestion measuring method and apparatus and image processing method and apparatus

  • US 6,188,778 B1
  • Filed: 12/17/1999
  • Issued: 02/13/2001
  • Est. Priority Date: 01/09/1997
  • Status: Expired due to Fees
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First Claim
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1. A traffic congestion measuring method of measuring a state of traffic congestion on the basis of a motion picture which represents a road and vehicles coming and going on said road and is formed by a series of images taken by a video camera, comprising the steps of:

  • (a) forming a criterion brightness image which is taken by said video camera and in which the vehicle is expected to be absent;

    (b) detecting the vehicles represented in one of said series of images taken at a predetermined time on the basis of said criterion brightness image and the image taken at said predetermined time;

    (c) renewing said criterion brightness image after said step (b); and

    (d) repeating said steps (b) and (c) at predetermined regular intervals, said criterion brightness image being renewed in said step (c) by an equation described as follows;

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