Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Patent
1998-02-02
2000-11-07
Swann, Tod R.
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
382306, 380201, 380205, 380239, 705 57, 705 62, 713176, 348473, G06F 1214
Patent
active
061450812
ABSTRACT:
Apparatus and methods are provided for embedding watermark information into a cover signal, such as an audio signal, video signal, or still image signal, in a manner that prevents the watermark information from being removed without degrading the quality of the cover signal. This is accomplished by subjecting the cover signal to a phase modulation prior to being embedded with the watermark information, wherein the amount or degree of phase modulation is changed at least for each different watermark to be embedded in a particular instance or copy of the cover signal. As such, if two copies of the same cover signal, each containing a different watermark, are averaged or combined in an attempt to obliterate the watermark information, the cover signal will be subjected to phase cancellation, rendering any illicit copy of such signal so derived to be valueless.
REFERENCES:
patent: 4969041 (1990-11-01), O'Grady et al.
patent: 5073925 (1991-12-01), Nagata et al.
patent: 5251041 (1993-10-01), Young et al.
patent: 5315098 (1994-05-01), Tow
patent: 5450490 (1995-09-01), Jensen et al.
patent: 5664018 (1997-09-01), Leighton
patent: 5809139 (1998-09-01), Girod et al.
patent: 5859920 (1999-01-01), Daly et al.
"A Psychovisual Approach to Digital Picture Watermarking", Delaigle, Vleeschouwer, Macq, Laboratorie de Telecommunications et Teledetection, Universite Catholique de Louvain, from: Signal Processing, 66(3), pp. 319-335, May 1998.
Ruanaidh, J.J.K. O, et al., "Phase Watermarking of Digital Images" Proceedings of the International Conference on Image Processing (IC Lausanne), IEEE, vol. 3, Sep. 16-19, 1996, pp. 239-242.
Jemili Kanaan
Metois Eric
Petrovic Rade
Winograd Joseph M.
Callahan Paul E.
Swann Tod R.
Verance Corporation
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