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Image size invariant visual cryptography for general access structures subjec...Ecway Technologies
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Image size invariant visual cryptography for general access structures subjec...Ecway Technologies
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Image size invariant visual cryptography for general access structures subject to display quality constraints
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IMAGE SIZE INVARIANT VISUAL CRYPTOGRAPHY FOR GENERAL ACCESS
STRUCTURES SUBJECT TO DISPLAY QUALITY CONSTRAINTS
ABSTRACT:
Conventional visual cryptography (VC) suffers from a pixel-expansion problem, or an
uncontrollable display quality problem for recovered images, and lacks a general approach to
construct visual secret sharing schemes (VSSs) for general access structures (GASs). We
propose herein a general and systematic approach to address these issues without sophisticated
codebook design. The approach can be used for binary secret images in non-computer-aided
decryption environments.
We design a set of column vectors to encrypt secret pixels rather than use the conventional VCbased approach. We begin by formulating a mathematic model for the VC construction problem
to find the column vectors for the optimal VC construction, after which we develop a simulatedannealing-based algorithm to solve the problem. The experimental results indicate that the
display quality of the recovered image is superior to that of previous studies.