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
10312025
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.
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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
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