Embedding Hidden Auxiliary Code Signals in Media

  • US 20090067672A1
  • Filed: 09/09/2008
  • Published: 03/12/2009
  • Est. Priority Date: 11/18/1993
  • Status: Active Grant
First Claim
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1. A method for detecting a code signal imperceptibly embedded in a host signal, the code signal being perceptually adapted to the host signal and including a plurality of registration symbols and variable message information symbols, where both the registration and message information symbols are redundantly embedded as embedded code signals in the host signal, the method comprising:

  • detecting embedded code signals corresponding to the registration and variable message symbols;

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

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

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