Region-in-Region incrementing visual cryptography scheme

Authors:
Ching-Nung Yang;Yi-Chin Lin;Chih-Cheng Wu
Affiliations:
Department of Computer Science and Information Engineering, National Dong Hwa University, Taiwan;Department of Computer Science and Information Engineering, National Dong Hwa University, Taiwan;Department of Computer Science and Information Engineering, National Dong Hwa University, Taiwan
Venue:
IWDW'12 Proceedings of the 11th international conference on Digital Forensics and Watermaking
Year:
2012

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Abstract

Recently, some region incrementing VCSs (RIVCSs) were proposed, which can gradually reconstruct secrets in a single image. In RIVCS, the secret image is subdivided into multiple secrecy level regions, in such a way that more shadows can be used to reveal the more secrecy level regions. The incrementing region property provides an attractive feature, which enables progressive decoding. However, the secret level regions of all previous RIVCSs are disjointed, which any two secrecy level regions do not have the same overlapping areas. In this paper, we discuss a (k, n) region-in-region incrementing VCS (RiRIVCS). Our (k, n)-RiRIVCS has (n(k+1) secrecy level regions, which the next secrecy level region is in the preceding secrecy level region. Such region allocations in our RiRIVCS have more areas to hide the secret than the non-overlapping regions in the previous RIVCS.