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Device for optically scanning a record carrier

  • US 6,415,040 B1
  • Filed: 05/20/1998
  • Issued: 07/02/2002
  • Est. Priority Date: 05/29/1997
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a watermark embedded in an information signal, comprising the steps of:

  • determining a decision variable indicating to which extent the watermark is present in the signal; and

    generating an output signal indicating detection of the watermark if the decision variable exceeds a predetermined threshold (y2); and

    randomly generating the output signal for decision values below the threshold (y2).

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