High performance gray-level watermarking system
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United States of America Patent
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May 30, 2006
Grant Date -
Sep 11, 2003
app pub date -
Mar 6, 2002
filing date -
Mar 6, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a gray-level watermarking system, in which sub-band and codebook technique are applied, and the feature of progressive transformation is utilized so as to randomly and evenly distribute the watermark to the entire data with the robustness and the visibility reduced. A four-fold key system is developed with encrypted key to exact the watermark, thus forming a system capable of protecting internet-transmitted multimedia signals such as audio, video ones that are combined with the watermark from being detected or attacked.
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