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:
Oct. 24, 2006
Filed:
Nov. 20, 2000
Geert Florimond Gerard Depovere, Eindhoven, NL;
Antonius Adrianus Cornelis Maria Kalker, Eindhoven, NL;
Jan Eveleens, Eindhoven, NL;
Geert Florimond Gerard Depovere, Eindhoven, NL;
Antonius Adrianus Cornelis Maria Kalker, Eindhoven, NL;
Jan Eveleens, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
In a method and arrangement for embedding and detecting a watermark in an information signal, the embedded watermark (W) is selected () from a plurality of watermarks (W. . . W) in dependence upon a property P of the signal. An example of such a property is the distribution of luminance values of the current video image as calculated by an analysis circuit (). The corresponding watermark detector performs the same operation: the watermark being looked for depends on the same signal property. It is achieved with the invention that the embedded watermark changes from time to time as a function of the information signal content, so that it cannot easily be hacked.
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