Data embedding employing degenerate clusters of data having differences less than noise value
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United States of America Patent
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Oct 6, 1998
Issued Date -
N/A
app pub date -
May 13, 1997
filing date -
Apr 2, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of embedding auxiliary information into a set of host data, such as a photograph, television signal, facsimile transmission, or identification card. All such host data contain intrinsic noise, allowing pixels in the host data which are nearly identical and which have values differing by less than the noise value to be manipulated and replaced with auxiliary data. As the embedding method does not change the elemental values of the host data, the auxiliary data do not noticeably affect the appearance or interpretation of the host data. By a substantially reverse process, the embedded auxiliary data can be retrieved easily by an authorized user.
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