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Lossless recovery of an original image containing embedded data

  • US 6,278,791 B1
  • Filed: 05/07/1998
  • Issued: 08/21/2001
  • Est. Priority Date: 05/07/1998
  • Status: Expired due to Term
First Claim
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1. A method for embedding metadata in and recovering meta-data from an n-bit original digital image, comprising the steps of:

  • a) forming a digital message from meta-data;

    b) converting the digital message to embedded data;

    c) adding the embedded data to the original image, pixel by pixel, using Modulo-N arithmetic, where N=2n, to form an n-bit modified digital image containing the embedded data such that the original digital image can always be exactly recovered given the modified image and the embedded data;

    d) extracting the embedded data from the modified digital image; and

    e) recovering exactly the original image by subtracting the embedded data from the modified image, pixel by pixel, using Modulo-N arithmetic, where N=2n.

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