An extended difference expansion algorithm for reversible watermarking

Authors:
Hsien-Wen Tseng;Chin-Chen Chang
Affiliations:
Department of Information Management, Chaoyang University of Technology, No. 168, Jifong E. Road, Wufong Township, Taichung County, Taiwan 41349, Taiwan, ROC;Department of Information Engineering and Computer Science, Feng Chia University, No. 100, Wenhwa Road, Seatwen, Taichung, Taiwan 40724, Taiwan, ROC
Venue:
Image and Vision Computing
Year:
2008

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Abstract

In this paper, a very high-capacity reversible watermarking algorithm is proposed. The algorithm extends Tian's method by histogram shifting to form a new type of pixel pair, which is called the shiftable pixel pair. The shiftable pixel pairs can increase the embedding capacity of a digital image while keeping the distortion low. Experimental results also show that the algorithm provides a large embedding capacity without making noticeable distortion. Besides, the original image can be completely restored after extraction.