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PERCEPTUALLY LOSSLESS COLOR COMPRESSION

  • US 20090067709A1
  • Filed: 09/08/2008
  • Published: 03/12/2009
  • Est. Priority Date: 09/07/2007
  • Status: Active Grant
First Claim
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1. A method of segmenting a mask layer of an image, comprising:

  • forming gradient components;

    using grayscale values of pixels adjacent to maximal gradient points within the gradient components to obtain respective threshold values for the gradient components;

    for each of the gradient components, using a respective one of said threshold values to threshold all pixels within a bounding box of the respective gradient component to form a respective thresholded component; and

    adding one or more of the thresholded components or an inverse of the one or more of the thresholded components to the mask layer.

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