Encoding and decoding signals for digital watermarking
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United States of America Patent
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Feb 10, 2009
Grant Date -
May 17, 2007
app pub date -
May 16, 2006
filing date -
Apr 25, 2001
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Abstract
This disclosure describes methods and systems for encoding a digital watermark into and/or detecting a digital watermark from a host (or media) signal such as audio, video or imagery. One implementation involves a method of detecting a digital watermark. The method includes: receiving a host signal carrying a digital watermark; computing attributes of the host signal; using the attributes of the host signal to compute a key; and using the key to detect the digital watermark in a transform domain dependent on the key. Other methods, systems and apparatus are provided as well.
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