Abstract
A watermark embedded in an information signal is detected by correlating said information signal with a plurality of watermarks Wj(n). The respective amounts of correlation C(i,j) are then evaluated to determine the watermark embedded in the signal xi(n). The invention provides a significant improvement of the detection by predictive filtering (25) the information signal and/or predictive filtering (26) the applied watermark prior to the process of correlating the signals.
| Original language | English |
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| Patent number | EP0940037 |
| Publication status | Published - 14 Sept 2005 |