An Improved Reversible Difference Expansion Watermarking Algorithm

Authors:
Sachnev Vasiliy;Hyoung-Joong Kim;Shijun Xiang;Jeho Nam
Affiliations:
CIST, Graduate School of Information Security and Management, Korea University, Seoul, Korea 136-701;CIST, Graduate School of Information Security and Management, Korea University, Seoul, Korea 136-701;College of Information Science and Technology, Jinan University, Guangzhou, P.R. China 510632;ETRI, Daejeon, Korea 305-700
Venue:
IWDW '07 Proceedings of the 6th International Workshop on Digital Watermarking
Year:
2008

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Abstract

In this paper, we propose an improved reversible watermarking algorithm by using the simplified location map. The proposed embedding method is based on the Alattar integer transform [3]. Here, we extend the case of using four pixels. Proposed simplified location map we propose just covers those necessary quads, the improved watermarking algorithm has a larger embedding capacity in comparison with the work of Alattar[3]. Simulation testing shows that our embedding strategy has achieved a better performance for all tested images.