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Unusual event detection using motion activity descriptors

  • US 6,823,011 B2
  • Filed: 11/19/2001
  • Issued: 11/23/2004
  • Est. Priority Date: 11/19/2001
  • Status: Expired due to Fees
First Claim
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1. A method for detecting an unusual event in a video, comprising:

  • extracting motion vectors from each frame in a video;

    determine zero run-length parameters for each frame from the motion vectors;

    summing the zero run-length parameters over predetermined time intervals of the video;

    determining a distance between the sum of the zero run-lengths of a current time interval and the sum of the zero run-lengths of a previous time interval;

    signalling the unusual event if the distance is greater than a predetermined threshold.

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