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Systems and methods for generating background and foreground images for document compression

  • US 7,783,117 B2
  • Filed: 03/26/2007
  • Issued: 08/24/2010
  • Est. Priority Date: 08/12/2005
  • Status: Expired due to Fees
First Claim
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1. A method for compressing an image comprising pixels, the method comprising:

  • identifying edge pixels using gradient pixels identified in a plurality of pixels selected from the image, in a first low-pass filtered set of the plurality of pixels, and in a second low-pass filtered set of the plurality of pixels;

    determining an edge pixel type for each of the identified edge pixels;

    using at least some of the identified edge pixels to label each pixel of the plurality of pixels;

    using the labeled pixels to identify non-background region pixels;

    generating a foreground image layer comprising the non-background region pixels;

    generating a background image layer comprising pixels with a background label;

    generating a mask layer that identifies from which of the foreground and background image layers a pixel should be selected when generating a representation of the plurality of pixels; and

    compressing the mask layer differently than at least one of the foreground and background image layers.

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