Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2008-07-01
2008-07-01
Revak, Christopher A (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C708S402000, C382S250000
Reexamination Certificate
active
07395432
ABSTRACT:
A watermark is embedded in spatial domain. However, the same effect as the watermark is embedded in frequency domain is obtained by inverse frequency transforming the watermark, and then embedding it. By doing that, robustness of the watermark is enhanced in comparison with conventional method for generating a watermark and adding it in spatial domain. Also, the watermark can be detected, even though an image is passed through stirmark, by enlarging the size of the watermark generated by inverse frequency transforming through re-sampling.In detecting the watermark, by high frequency filtering the watermarked image and getting all blocks of the watermarked image together, the effect of removing image component is obtained. Thereby, the detection speed of the watermark is improved, and the detection rate is increased as well.
REFERENCES:
patent: 5768426 (1998-06-01), Rhoads
patent: 5905800 (1999-05-01), Moskowitz et al.
patent: 6209094 (2001-03-01), Levine et al.
patent: 6219634 (2001-04-01), Levine
patent: 6320965 (2001-11-01), Levine
patent: 6330673 (2001-12-01), Levine
patent: 6345100 (2002-02-01), Levine
patent: 6823455 (2004-11-01), Macy et al.
patent: 0 962 886 (1999-12-01), None
patent: 0 967 803 (1999-12-01), None
patent: 0 962 886 (2001-08-01), None
patent: 0 967 803 (2001-10-01), None
Djurovic, I., Stankovic, S., Pitas, I., Stankovic, LJ., and Tilp, J., “Generalization of the Fourier Domain Watermarking to the Space/Spatial-Frequency Domain”, First Int'l Workshop on Image and Signal Processing and Analysis, Jun. 14-15, 2000, pp. 47-51, Pula, Croatia.
Choi Jong-Uk
Lee Jung-Soo
Markany Inc.
Revak Christopher A
Senniger Powers LLP
LandOfFree
Method of embedding/detecting digital watermark and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of embedding/detecting digital watermark and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of embedding/detecting digital watermark and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2786061