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Authentication of documents and articles by moire patterns

  • US 20040076310A1
  • Filed: 10/16/2002
  • Published: 04/22/2004
  • Est. Priority Date: 10/16/2002
  • Status: Active Grant
First Claim
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1. A method for authenticating documents by using moiré

  • patterns, the method comprising the steps of;

    a) superposing a document with a base layer comprising patterns and a revealing layer comprising a revealing line grating, thereby producing moiré

    patterns and b) comparing said moiré

    patterns with reference moiré

    patterns and depending on the result of the comparison, accepting or rejecting the document, where successive lines of the revealing line grating sample within the base layer different instances of the patterns and where the produced moiré

    patterns are a transformation of base layer patterns, said transformation comprising at least an enlargement.

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