Multiuser-based 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, USA;School of Electrical and Information Engineering, University of South Australia, Australia;Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Taiwan, ROC

  • Venue:
  • Information Sciences: an International Journal
  • Year:
  • 2007

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Abstract

A new watermarking scheme having 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 this 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.