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Method of processing image information and method of preventing forgery of certificates or the like

  • US 6,438,251 B1
  • Filed: 12/02/1998
  • Issued: 08/20/2002
  • Est. Priority Date: 12/03/1997
  • Status: Expired due to Term
First Claim
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1. An image processing method comprising:

  • converting predetermined additional information into a visible additional image to be embedded in a main image;

    creating a composite image by modulating the additional image by using a predetermined mask pattern information and embedding the additional image in the main image in a state of invisibility;

    recording the composite image on a recording medium; and

    extracting the embedded additional image from the composite image recorded on the recording medium to recover the predetermined information.

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