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Reference palette embedding

  • US 6,021,196 A
  • Filed: 05/26/1998
  • Issued: 02/01/2000
  • Est. Priority Date: 05/26/1998
  • Status: Expired due to Fees
First Claim
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1. A method of embedding auxiliary data into publication quality digital image data represented by a quantity of color-component values for each picture element comprising the steps of:

  • reducing said quantity of color-component values of said publication quality digital image data, to create a digital reference palette, wherein said digital color palette represents said quantity of color-component values of said publication quality digital image data;

    creating a digital representation of said auxiliary data as a sequence of individual bit values;

    creating a color-component digital difference image by numerically combining said publication quality digital image with said digital reference palette image;

    modifying said color-component digital difference image by combining said auxiliary data and said color-component digital difference image through use of a data embedding method;

    creating a modified publication quality digital image indiscernibly containing said auxiliary data by combining said modified color-component digital difference image and said digital reference palette image; and

    outputting said modified publication quality digital image into a file format specified for said modified publication quality digital image.

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