Traffic monitoring device and method

  • US 5,912,634 A
  • Filed: 12/09/1996
  • Issued: 06/15/1999
  • Est. Priority Date: 04/08/1994
  • Status: Expired due to Term
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First Claim
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1. A traffic monitoring device comprising:

  • a picture recording unit provided for recording a sequence of successive traffic pictures of a same traffic road;

    a detection zone determination unit connected with the picture recording unit and provided for determining a traffic detection zone within the traffic pictures of said sequence by superposing on said traffic picture a follower axis, comprising a predetermined number of points (Xi) distributed thereover, said follower axis being situated within and extending substantially in parallel with a traffic axis within said traffic road; and

    a picture analysis unit provided for cooperating with the picture recording unit and the detection zone determination unit and for determining on a grey value of at least two of said successive points (Xi) within each supplied traffic picture and for verifying if said grey value exceeds a predetermined threshold on said at least two successive points of said follower axis and for assigning to said points for which said grey value exceeds said threshold an identification pattern, said picture analysis unit being also provided for checking within subsequent traffic pictures of said sequence if said identification pattern is again assigned to at least two points.

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