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Emulsion film media employing steganography

  • US 6,438,231 B1
  • Filed: 08/17/2000
  • Issued: 08/20/2002
  • Est. Priority Date: 03/17/1994
  • Status: Expired due to Fees
First Claim
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1. A photographic emulsion film for exposing and developing to produce an image thereon, characterized by an auxiliary information signal encoded therein, said signal being encoded as a patterned physical characteristic coextensive with said film.

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