Traffic sensor

  • US 6,760,061 B1
  • Filed: 04/13/1998
  • Issued: 07/06/2004
  • Est. Priority Date: 04/14/1997
  • Status: Expired due to Fees
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First Claim
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1. Apparatus for detecting at least one vehicle, comprising:

  • at least one camera that provides a first video frame that is representative of a field of view of said camera; and

    a computation unit operative to;

    (1) organize the first video frame and a second video frame also representative of the field of view of the camera into respective pluralities of tiles, each tile being a set of adjacent pixels having predetermined dimensions smaller than a representation of the vehicle in the first video frame, said second video frame being a reference frame representing a combination of previous frames from said camera and being updated by combining selected new frames with said combination of previous frames, said combination of previous frames being weighted more heavily than each said new frame during said update of said second video frame, (2) compare each of a plurality of tiles of the first video frame with a corresponding tile from the second video frame to detect a difference of predetermined magnitude and type, wherein for each tile, if the difference of predetermined magnitude and type is detected, then the tile is in a first state, and if the difference of said predetermined magnitude and type is not detected, then the tile is in a second state, and (3) determine whether a plurality of proximate tiles are in said first state, such a determination indicating that the vehicle is present in the field of view of said camera at a current position represented by said plurality of proximate tiles.

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