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:
Nov. 05, 2002
Filed:
Nov. 04, 1999
Antonius A. C. M. Kalker, Eindhoven, NL;
Jaap A. Haitsma, Eindhoven, NL;
Maurice J. J. J.-B Maes, Eindhoven, NL;
Geert F. G. Depovere, Eindhoven, NL;
Johan P. M. G. Linnartz, Eindhoven, NL;
Koninklijke Phillips Electronics, NV, Eindhoven, NL;
Abstract
A method and arrangement for detecting a watermark in an information signal. The method may include the steps of computing the correlation (d ) of the watermark (W ) and the information signal (e.g. an image Q) for a plurality of positions (k) of the watermark with respect to the information signal, and detecting whether at least one of the respective correlation values exceeds a given threshold. The step of detecting may include determining the standard deviation (&sgr; ) of the respective correlation values (d ), and setting the threshold to a given multiple (T) of the standard deviation. The multiple (T) is derived form a desired false alarm rate (watermark detected when there is none, or no watermark detected when there is one).