Difference expansion based reversible data hiding using two embedding directions
Hu, Yongjian, Lee, Heung-Kyu, Chen, Kaiying and Li, Jianwei. (2008) Difference expansion based reversible data hiding using two embedding directions. IEEE Transactions on Multimedia, Vol.10 (No.8). pp. 1500-1512. ISSN 1520-9210Full text not available from this repository.
Official URL: http://dx.doi.org/10.1109/TMM.2008.2007341
Current difference-expansion (DE) embedding techniques perform one layer embedding in a difference image. They do not turn to the next difference image for another layer embedding unless the current difference image has no expandable differences left. The obvious disadvantage of these techniques is that image quality may have been severely degraded even before the later layer embedding begins because the previous layer embedding has used up all expandable differences, including those with large magnitude. Based on integer Haar wavelet transform, we propose a new DE embedding algorithm, which utilizes the horizontal as well as vertical difference images for data hiding. We introduce a dynamical expandable difference search and selection mechanism. This mechanism gives even chances to small differences in two difference images and effectively avoids the situation that the largest differences in the first difference image are used up while there is almost no chance to embed in small differences of the second difference image. We also present an improved histogram-based difference selection and shifting scheme, which refines our algorithm and makes it resilient to different types of images. Compared with current algorithms, the proposed algorithm often has better embedding capacity versus image quality performance. The advantage of our algorithm is more obvious near the embedding rate of 0.5 bpp.
|Item Type:||Journal Article|
|Subjects:||Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software|
|Divisions:||Faculty of Science > Computer Science|
|Journal or Publication Title:||IEEE Transactions on Multimedia|
|Official Date:||December 2008|
|Page Range:||pp. 1500-1512|
|Access rights to Published version:||Restricted or Subscription Access|
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