The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2002
Filed:
May. 20, 1998
Johan P. M. G. Linnartz, Eindhoven, NL;
Maurice J. J. J-B. Maes, Eindhoven, NL;
Antonius A. C. M. Kalker, Eindhoven, NL;
Geert F. G. Depovere, Eindhoven, NL;
Peter M. J. Rongen, Eindhoven, NL;
Christianus W. F. Vriens, Eindhoven, NL;
Marten E. Van Dijk, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A watermark detector is disclosed to judge whether multimedia content can be copied or not. The watermark detector examines the multimedia content and outputs a signal indicating whether a watermark is present or not. A decision variable indicating to which extent the watermark is present is determined, for example, the amount of correlation between the input signal and a reference copy of the watermark to be detected. The watermark is detected if the decision variable exceeds a predetermined threshold (y ). The detector also generates a random output signal for a predetermined range of decision values between the threshold (y ) and a further threshold (y ).