High performance gray-level watermarking system

Details High performance gray-level watermarking system High performance gray-level watermarking system

2006-05-30

2006-05-30

Barron, Jr., Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C382S100000

Reexamination Certificate

active

07055037

ABSTRACT:
The present invention relates to a gray-level watermarking system, in which sub-band and codebook technique are applied, and the feature of progressive transformation is utilized so as to randomly and evenly distribute the watermark to the entire data with the robustness and the visibility reduced. A four-fold key system is developed with encrypted key to exact the watermark, thus forming a system capable of protecting internet-transmitted multimedia signals such as audio, video ones that are combined with the watermark from being detected or attacked.

REFERENCES:
patent: 6332030 (2001-12-01), Manjunath et al.

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