Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-01-17
2006-01-17
Wright, Norman M. (Department: 2134)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S181000, C713S167000
Reexamination Certificate
active
06988202
ABSTRACT:
Utilizes pre-processing (pre-filtering) of target data in order to facilitate and enable robust extraction of a watermark signal. With the present invention the watermarked data is pre-filtered using knowledge of the watermark signal. That is, utilizing knowledge of the characteristics of the watermark signal (for example that it falls in a certain frequency range), aspects or portions of the signal that do not carry the watermark signal are eliminated by filtering. Such filtering can amplify the watermark signal and/or simultaneously reduces the strength of the original (host) content or noise in the data signal that contains the watermark. That is, pre-filtering increases the signal-to-noise ratio of the watermark signal and facilitates the watermark extraction steps (detection and decoding). With the present invention it is possible to extract weak watermark signals from target data.
REFERENCES:
patent: 4237484 (1980-12-01), Brown et al.
patent: 4313197 (1982-01-01), Maxemchuk
patent: 4855697 (1989-08-01), Jones et al.
patent: 4907156 (1990-03-01), Doi et al.
patent: 4972471 (1990-11-01), Gross et al.
patent: 5101432 (1992-03-01), Webb
patent: 5175710 (1992-12-01), Hutson
patent: 5319735 (1994-06-01), Preuss et al.
patent: 5659726 (1997-08-01), Sandford et al.
patent: 5768426 (1998-06-01), Rhoads
patent: 5825892 (1998-10-01), Braudaway et al.
patent: 5832119 (1998-11-01), Rhoads
patent: 5841886 (1998-11-01), Rhoads
patent: 5841978 (1998-11-01), Rhoads
patent: 5850481 (1998-12-01), Rhoads
patent: 5859920 (1999-01-01), Daly et al.
patent: 5862260 (1999-01-01), Rhoads
patent: 5889868 (1999-03-01), Moskowitz
patent: 5933798 (1999-08-01), Linnartz
patent: 6031914 (2000-02-01), Tewfik
patent: 6122403 (2000-09-01), Rhoads
patent: 6259801 (2001-07-01), Wakasu
patent: 6310962 (2001-10-01), Chung et al.
patent: 6330673 (2001-12-01), Levine
patent: 6341350 (2002-01-01), Miyahara et al.
patent: 6345100 (2002-02-01), Levine
patent: 6442284 (2002-08-01), Gustafson et al.
patent: 6557103 (2003-04-01), Boncelet, Jr. et al.
patent: 2002/0029338 (2002-03-01), Bloom et al.
patent: 2002/0090110 (2002-07-01), Braudaway et al.
patent: WO01/39121 (2001-05-01), None
patent: WO02/13138 (2002-02-01), None
U.S. Appl. No. 09/612,177, filed Jul. 6, 2000, Rhoads.
U.S. Appl. No. 60/351,502, filed Jan. 22, 2002, Bradley.
Kutter, Performance Improvement of Spread Spectrum Based Image Watermarking Schemes Through M-ary Modulation Dresden Information Hiding Workshop, 1999, pp. 245-259.
Alattar Adnam M.
Rhoads Geoffrey
Sharma Ravi K.
Digimarc Corporation
Digimarc Corporation
Wright Norman M.
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