Watermark detection
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United States of America Patent
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Jan 7, 2003
Grant Date -
N/A
app pub date -
Nov 4, 1999
filing date -
Mar 4, 1998
priority date (Note) -
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Abstract
An improved method and arrangement for detecting a watermark in an information (e.g. image or video) signal are disclosed. The detection is more reliable and less vulnerable to image processing by subjecting the suspect image (q) and the watermark to be detected (w) to Symmetrical Phase Only Matched Filtering (24-28,16) prior to detecting (29) the amount of correlation (d) between said signals.
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