Detecting hidden auxiliary code signals in media

CAFC
  • US 7,672,477 B2
  • Filed: 09/09/2008
  • Issued: 03/02/2010
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a code signal imperceptibly embedded in a host signal, the code signal including a plurality of registration symbols and variable message information symbols, where both the registration symbols and variable message information symbols are redundantly embedded as embedded code signals in the host signal, the method comprising:

  • using a programmed electronic processor, detecting embedded code signals corresponding to the registration symbols and the variable message information symbols;

    verifying detection of the embedded code signals corresponding to the registration symbols; and

    verifying detection of the variable message information symbols by checking correspondence of the values of the variable message information symbols relative to the registration symbols with an expected sequence of values.

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