A digital authentication watermarking scheme for JPEG images with superior localization and security |
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基金项目: | 国家自然科学基金;教育部新世纪高校优秀人才计划;四川省青年科技基金;国防科技科研项目 |
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摘 要: |
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收稿时间: | 15 July 2006 |
修稿时间: | 15 March 2007 |
A digital authentication watermarking scheme for JPEG images with superior localization and security |
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Authors: | Yu Miao He HongJie Zhang JiaShu |
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Affiliation: | Sichuan Key Lab of Signal and Information Processing, Southwest Jiaotong University, Chengdu 610031,China |
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Abstract: | The drawbacks of the current authentication watermarking schemes for JPEG images, which are inferior localization and the
security flaws, are firstly analyzed in this paper. Then, two counterferiting attacks are conducted on them. To overcome these
drawbacks, a new digital authentication watermarking scheme for JPEG images with superior localization and security is proposed.
Moreover, the probabilities of tamper detection and false detection are deduced under region tampering and collage attack
separately. For each image block, the proposed scheme keeps four middle frequency points fixed to embed the watermark, and
utilizes the rest of the DCT coefficients to generate 4 bits of watermark information. During the embedding process, each
watermark bit is embedded in another image block that is selected by its corresponding secret key. Since four blocks are randomly
selected for the watermark embedding of each block, the non-deterministic dependence among the image blocks is established
so as to resist collage attack completely. At the receiver, according to judging of the extracted 4 bits of watermark information
and the corresponding 9-neighbourhood system, the proposed scheme could discriminate whether the image block is tampered or
not. Owing to the diminishing of false detection and the holding of tamper detection, we improve the accuracy of localization
in the authentication process. Theoretic analysis and simulation results have proved that the proposed algorithm not only
has superior localization, but also enhances the systematic security obviously.
Supported by the National Natural Science Foundation of China (Grant No. 60572027), the Program for New Century Excellent
Talents in University of China (Grant No. NCET-05-0794), the Sichuan Youth Science & Technology Foundation (Grant No. 03ZQ026-033),
the National Defense Pre-research Foundation of China (Grant No. 51430804QT2201) and the Application Basic Foundation of Sichuan
Province, China (Grant No. 2006 J13-10) |
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Keywords: | fragile watermarking JPEG compression localization accuracy collage attack |
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