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Digital video content fingerprinting based on scale invariant interest region detection with an array of anisotropic filters

  • US 8,189,945 B2
  • Filed: 11/05/2009
  • Issued: 05/29/2012
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. A method for content based video sequence identification comprising:

  • applying a bi-level filter to images in a first pass analysis to detect a set of initial interest points in a plurality of selected video frames, wherein the first pass analysis reduces the effective area of the images in each selected video frame to multiple smaller images; and

    applying an array of anisotropic filters to regions of pixels around each initial interest point of the set of initial interest points in a second pass analysis to refine a spatial position for each initial interest point and determine a first scale parameter in the x direction (sx) and a second scale parameter in the y direction (sy), wherein the sx and the sy scale parameters are separately varied to provide accurate region characterizations that are resistant to image distortion for identification of the plurality of selected video frames in a video sequence.

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