Vehicle speed monitoring system

  • US 5,734,337 A
  • Filed: 10/31/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 11/01/1995
  • Status: Expired due to Fees
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First Claim
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1. A method for determining a vehicle'"'"'s speed within a traffic lane, the method to be used with a camera including a lens and a viewing field that generates images of the vehicle within the camera'"'"'s viewing field, the method comprising the steps of:

  • generating first and second images of the vehicle while at least one feature of the vehicle is in the viewing field, the one feature being a reference point on the vehicle, the second image following the first image by a known time period;

    determining the feature positions in the first and second images;

    converting the first and second image feature positions to actual positions within the traffic lane to compensate for non-linearities; and

    mathematically combining the first and second actual positions and the known time period to determine a precise vehicle speed.

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