Reversible watermarking for error diffused halftone images using statistical features

Authors:
Zhe-Ming Lu;Hao Luo;Jeng-Shyang Pan
Affiliations:
Visual Information Analysis and Processing Research Center, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, P.R. China;Visual Information Analysis and Processing Research Center, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, P.R. China;Department of Electronic Engineering, Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, ROC
Venue:
IWDW'06 Proceedings of the 5th international conference on Digital Watermarking
Year:
2006

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Abstract

This paper proposes a reversible watermarking scheme for error diffused halftone images. It exploits statistical features of 2×2 binary patterns in halftone images to embed data. According to a small look-up table constructed in advance, a state sequence is extracted and losslessly compressed, and the saved space is filled up with the watermark and some side information. We modulate the extracted state sequence into a new concatenated sequence by similar pair toggling, and meanwhile the watermark and the LUT are embedded. The proposed scheme can provide a considerable capacity and the original image can be recovered if its watermarked version is intact.