Detecting a watermark embedded in an information signal
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United States of America Patent
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Aug 3, 1999
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N/A
app pub date -
Jul 16, 1997
filing date -
Jul 16, 1996
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Abstract
To detect a watermark signal embedded within an information signal, predictive filtering is applied to either the information signal, a plurality of applied watermark signals, or both types of signals. After the filtering, a correlation is determined between the information signal and the watermark signals. The amount of the correlation is indicative of whether a particular watermark is embedded within the information signal.
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