Shadow watermark extraction system

Authors:
Feng-Hsing Wang;Kang K. Yen;Lakhmi C. Jain;Jeng-Shyang Pan
Affiliations:
School of Electrical and Information Engineering, University of South Australia, Australia;Department of Electrical and Computer Engineering, Florida International University;School of Electrical and Information Engineering, University of South Australia, Australia;Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Taiwan
Venue:
KES'05 Proceedings of the 9th international conference on Knowledge-Based Intelligent Information and Engineering Systems - Volume Part II
Year:
2005

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Abstract

A new watermarking scheme which provides the ability of sharing secret with multi-users is proposed. It splits the original watermark into two shares and embeds one share into the cover image to increase the security. A polarization procedure is performed to establish a polarity stream from the cover image. The second share and the polarity stream are used to generate a master key and several normal keys. In our system, only the super user can reveal the genuine watermark directly. Other users possess the normal keys can obtain shadow watermarks merely. By combining the shadow watermarks together, the real watermark can be recovered.