×

Watermarking an informational signal

  • US 6,570,996 B1
  • Filed: 09/02/1998
  • Issued: 05/27/2003
  • Est. Priority Date: 09/02/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. Apparatus for detection of a watermark in an information signal, comprising:

  • means for receiving said information signal, said signal having therein a series of multi-bit watermark values, each such bit value representing a respective watermark subpattern;

    means for determining, for each watermark subpattern, a correlation value y(n) indicative of whether or not said subpattern is present in the information signal;

    means for combining the correlation values of all subpatterns to determine (D) the presence of an applied multi-bit value watermark pattern in the information signal regardless of the multi-bit value of the applied watermark pattern; and

    means for comparing the correlation values of all subpatterns with a corresponding bit value of the applied watermark multi-bit values to obtain an indication (M) of the extent which the multi-bit values of the detected watermark patterns corresponds to the multi-bit value of the applied watermark pattern.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×