Method of extracting a watermark
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United States of America Patent
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May 15, 2012
Grant Date -
Jun 1, 2006
app pub date -
Apr 25, 2003
filing date -
May 22, 2002
priority date (Note) -
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Abstract
A monitoring station for monitoring distribution of media content, on basis of a watermark, comprises: receiving means for receiving an information signal representing the media content to which the watermark is added; extracting means for extracting perceptual features, identifying the information signal; first retrieving means for retrieving a supporting signal on basis of the perceptual features; second retrieving means for retrieving the watermark on basis of the supporting signal; and comparing means for comparing the watermark with predetermined information.
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