Watermark detection
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United States of America Patent
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Nov 5, 2002
Grant Date -
N/A
app pub date -
Nov 4, 1999
filing date -
Mar 4, 1998
priority date (Note) -
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Abstract
A method and arrangement for detecting a watermark in an information signal. The method may include the steps of computing the correlation (d.sub.k) of the watermark (W.sub.i) 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 (.sigma..sub.d) of the respective correlation values (d.sub.k), 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).
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