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Hierarchical sudden illumination change detection using radiance consistency within a spatial neighborhood

  • US 9,373,055 B2
  • Filed: 12/16/2008
  • Issued: 06/21/2016
  • Est. Priority Date: 12/16/2008
  • Status: Active Grant
First Claim
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1. A computer-implemented method for detecting a sudden illumination change (SIC) in a sequence of video frames, comprising:

  • receiving a current video frame, of the sequence of video frames;

    identifying one or more sets of pixels in the current video frame, wherein each set of pixels is classified as depicting a foreground object;

    for each pixel in at least a first one of the sets of pixels;

    identifying a radiance value for the pixel and for each pixel within a spatial neighborhood of the pixel, anddetermining, for the pixel, whether the radiance values for the pixel and the pixels in the spatial neighborhood indicate that a sudden illumination change has occurred in a scene depicted by the sequence of video frames; and

    upon determining that a majority of pixels in the first set of pixels indicate that a sudden illumination change has occurred, reclassifying one or more pixels in the first set of pixels as depicting a background of the scene in the current frame, wherein the reclassified pixels were classified as depicting scene background in one or more frames prior to the current frame.

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