Cryptography – Cryptanalysis
Patent
1996-09-04
1998-12-08
Cangialosi, Salvatore
Cryptography
Cryptanalysis
380 34, H04L 900
Patent
active
058481559
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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Cangialosi Salvatore
Feig Philip J.
NEC Research Institute Inc.
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