Spread spectrum watermark for embedded signalling
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United States of America Patent
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Dec 8, 1998
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N/A
app pub date -
Sep 4, 1996
filing date -
Sep 4, 1996
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Abstract
A watermark is embedded into audio/video/image/multimedia data using spread spectrum methodology. The watermark is extracted from watermarked data without the use of an original or unwatermarked version of the data by using spatial or temporal local averaging of the frequency coefficients of the watermarked data.
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