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Digital Video Content Fingerprinting Based on Scale Invariant Interest Region Detection with an Array of Anisotropic Filters

  • US 20120207402A1
  • Filed: 04/25/2012
  • Published: 08/16/2012
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. A method of applying an array of anisotropic filters for image scale-space analysis, the method comprising:

  • forming an array of elliptic-shaped anisotropic filters with a first scale parameter in the x direction (sx) and a second scale parameter in the y direction (sy) as scale parameters (sx, sy), wherein the sx and the sy scale parameters are separately varied to provide accurate region characterization;

    analyzing scale space for a selected frame by the array of elliptic-shaped anisotropic filters of finite spatial support corresponding to selected different values of the (sx) and (sy) scale parameters;

    computing a Hessian determinant response image for each elliptic-shaped anisotropic filter of finite spatial support corresponding to selected pairs (sx, sy) of scale parameters; and

    determining a set of local maxima in contiguous 4-dimensional scale-space volumes of the Hessian determinant response images with coordinates (x, y, sx, sy).

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