Encoding and decoding auxiliary signals
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United States of America Patent
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May 1, 2012
Grant Date -
Dec 23, 2010
app pub date -
Apr 27, 2010
filing date -
Apr 25, 2001
priority date (Note) -
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Abstract
This disclosure describes apparatus and systems for encoding and decoding signals from a host signal such as audio, video or imagery. One claim recites an apparatus comprising: electronic memory for storing a media signal representing audio or video; and an electronic processor. The electronic processor is programmed for: extracting data representing at least some features of the media signal; using the extracted data as a key to select coefficients in a transform domain, the coefficients representing the media signal; and modifying selected coefficients to hide a steganographic signal in the media signal. Of course, other claims and combinations are provided as well.
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