Detection of change in posture in video

  • US 7,613,324 B2
  • Filed: 06/24/2005
  • Issued: 11/03/2009
  • Est. Priority Date: 06/24/2005
  • Status: Active Grant
First Claim
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1. A computer readable medium storing computer readable program code for causing a computer to perform a method, comprising the steps of:

  • receiving input video data;

    detecting a target in the video data;

    tracking the target;

    identifying a target as a human; and

    detecting a change in a posture of the human target in the video data when a change in at least one of a height or aspect ratio of the human target exceeds a predetermined threshold by determining the height or the aspect ratio of the target in a first frame of the video data;

    determining the height or aspect ratio of the target in a second frame of the video data;

    calculating a difference between the height or aspect ratio of the target in the first and second frames;

    detecting the change in the posture when either difference exceeds a predetermined threshold;

    determining an elapsed time between the first and second frames; and

    detecting the change in the posture when the elapsed time is below a predetermined threshold.

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