NDLI: Approaching optimal value expansion for reversible watermarking

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Approaching optimal value expansion for reversible watermarking

Content Provider	ACM Digital Library
Author	Schmucker, Martin Yang, Bian Busch, Christoph Sun, Shenghe Niu, Xiamu
Abstract	We investigate in this paper several recently proposed reversible watermarking algorithms based on value expansion schemes: bit-shifting, histogram modification, spread spectrum, companding and prediction-error expansion, and present a general model - histogram expansion - for all value expansion based reversible watermarking algorithms, which demonstrates a unified view of these different algorithms and gives them a performance comparison in terms of watermarking distortion and embedding capacity from this unified view.With this general model of histogram expansion, performance of different value expansion algorithms can be evaluated and compared directly from their value expansion modes. A better value expansion mode has an advantage in performance from its inherent value expansion structure, which is stable to different input testing media.We deduce from this general model a formulated distortion estimation, which in form guarantees the existence of the optimal value expanding scheme for a specific media to be watermarked. The optimal value expansion can be achieved by optimization methods if the relevant computational complexity is permitted in practical applications. For simplicity, we propose a sub-optimal but efficient value expanding scheme to approach the best performance of reversible watermarking.In the later part of this paper, we investigate the possibility to further increase the performance by improving the histogram generating patterns in the sense of clearer separation of scale values in different ranges. All ideas proposed above are perfectly demonstrated in our experiments.
Starting Page	95
Ending Page	102
Page Count	8
File Format	PDF
ISBN	1595930329
DOI	10.1145/1073170.1073188
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-08-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Reversible watermarking Histogram expansion Value expansion
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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