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Encoding small amounts of embedded digital data at arbitrary locations within an image

  • US 6,439,465 B1
  • Filed: 09/24/1999
  • Issued: 08/27/2002
  • Est. Priority Date: 09/24/1999
  • Status: Expired due to Term
First Claim
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1. A process for printing a small amount of embedded digital data in an arbitrary region of an image on media, comprising:

  • encoding the digital data into a rectangular area of glyphs;

    surrounding the rectangular area of glyphs with a rectangular sync lattice;

    locating a region in the image which contains arbitrary graphical elements;

    printing the encoded digital data and the sync lattice in the located region, such that arbitrary graphical elements surround the sync lattice, wherein the encoded digital data appears visually indistinguishable from the located region and wherein the printed sync lattice comprises enough bits to distinguish it from the surrounding arbitrary graphical elements during decoding.

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