The security of digital media content has received significant attention as the usage of multimediahas increased in today's society. Digital watermarking is widely applied for digital image copyright protection and authentication. The extraction and verification of the watermark can be used for many applications, for example, authenticating the image. In some situations, the authentication should be accessible to all, thus public-key watermarking would be necessary.
In addition, many essential image-embedded documents are kept in a physical format and used widely for authentication purposes. These documents include the personal ID, license, passport, immigration document, commercial ticket with identity information, personal medical report, etc.
A digital watermarking system with high embedding capacity, robust to various attacks, high extraction efficiency is needed for such practical use. A public-key watermarking system is proposed for such applications. The embedded watermark/message can be extracted and verified publicly using a public-key. The watermark extraction process is efficient and blind. The watermark can be only embedded by the document issuer. The watermark embedded is robust against not only common digital signal processing attacks, geometric attacks but also the print-scan process. Differing from existing watermarking approaches, the watermark is embedded according to the result of proposed object weight map detection and automatic object segmentation. Higher watermark robustness and embedding capacity are achieved. Our simulation results demonstrate that the proposed approach is effective and is able to be applied to various applications.
|Advisor:||King, Brian, Hu, Jianghai|
|Commitee:||Delp, Edward J., Salama, Paul|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- Indiana|
|Source:||DAI-B 79/07(E), Dissertation Abstracts International|
|Subjects:||Computer Engineering, Engineering|
|Keywords:||Digital watermarking, Image, Object, Robust|
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