Region-in-Region Incrementing Visual Cryptography Scheme
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.
KeywordsSecret sharing Visual cryptography Region incrementing visual cryptography
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- 2.Ito, R., Kuwakado, H., Tanaka, H.: Image size invariant visual cryptography. IEICE Trans. on Fund. of Elect. Comm. and Comp. Sci. E82-A, 2172–2177 (1999)Google Scholar
- 15.Cimato, S., Yang, C.N.: Visual cryptography and secret image sharing. CRC Press, Taylor & Francis (2011)Google Scholar