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Method for embedding digital information in an image

  • US 6,044,182 A
  • Filed: 07/29/1998
  • Issued: 03/28/2000
  • Est. Priority Date: 11/30/1995
  • Status: Expired due to Term
First Claim
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1. A method of embedding digital data in a source image, comprising the steps of:

  • (a) generating a multi-level data image representing the digital data;

    (b) generating an encoding carrier image f(x,y) having spatially dispersing properties defined by its Fourier transform F(u,v) wherein
    
    
    space="preserve" listing-type="equation">F(u,v)=|F(u,v)|e.sup.iφ

    (u,v) with phase response φ

    (u,v)≠

    0;

    (c) convolving the multi-level data image with the encoding carrier image to produce a spatially dispersed data image altered by the phase response; and

    (d) adding the spatially dispersed data image to the source image to produce a source image containing embedded data.

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