High-robustness dual transform domain image zero watermarking method
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING UNIV OF POSTS & TELECOMM
- Publication Date
- 2009-12-16
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Description
technical field
[0001] This patent is to use the energy aggregation effect of the low-frequency sub-band of wavelet transform and the singular value stability of singular value decomposition to invent a robust image zero watermark method, so as to be more conducive to the realization of copyright certification and copyright protection. Background technique
[0002] Significant developments in multimedia technology have made it fairly easy to illegally copy and distribute valuable, copyright-protected digital products. This so-called piracy has caused enormous economic losses to the music, video, broadcasting and software industries. Traditional copyright protection methods include: restricting the access of certain sites in the communication network, encrypting multimedia data and strictly managing passwords. This so-called "trust system" achieves copyright protection by preventing unauthorized users from accessing multimedia data. However, once authorized users illegally ...