OR-based Visual Cryptographic Schemes (OVCS) suffer from poor visual quality of the reconstructed image. XOR-based visual secret sharing (XVCS) can be thought of as an alternative where the relative contrast of the reconstructed image is much better. Moreover, it is possible to achieve optimum relative contrast equal to 1 in XVCS which is an impossibility in case of OVCS. Although there are examples of XVCSs where optimum relative contrast is achieved but to the best of our knowledge, this is the first theoretical work to find a necessary and sufficient condition for a XOR-based VCS to achieve optimum relative contrast equal to 1 in terms of the underlying access structure.
CITATION STYLE
Dutta, S., & Adhikari, A. (2017). Contrast Optimal XOR Based Visual Cryptographic Schemes. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 10681 LNCS, pp. 58–72). Springer Verlag. https://doi.org/10.1007/978-3-319-72089-0_4
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