Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1996-09-19
2000-05-30
Tse, Young T.
Pulse or digital communications
Spread spectrum
Direct sequence
375130, 375243, 380 5, H04B 169
Patent
active
060699140
ABSTRACT:
A watermark is embedded into 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 MPEG/JPEG coefficients. The image to be watermarked is divided into subimages. Each subimage is embedded with a watermark. When extracting the watermark, the result from each subimage is combined to determine the originally embedded watermark.
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Brosemer Jeffery J.
Feig Philip J.
NEC Research Institute Inc.
Tse Young T.
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