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 VC-
based 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 simulated-
annealing-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.
ECWAY TECHNOLOGIES
IEEE PROJECTS & SOFTWARE DEVELOPMENTS
OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE
BANGALORE / HYDRABAD
CELL: +91 98949 17187, +91 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 / 8111
VISIT: www.ecwayprojects.com MAIL TO: ecwaytechnologies@gmail.com

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Image size invariant visual cryptography for general access structures subject to display quality constraints

1. 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 VC- based 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 simulated- annealing-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. ECWAY TECHNOLOGIES IEEE PROJECTS & SOFTWARE DEVELOPMENTS OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE BANGALORE / HYDRABAD CELL: +91 98949 17187, +91 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 / 8111 VISIT: www.ecwayprojects.com MAIL TO: ecwaytechnologies@gmail.com

Image size invariant visual cryptography for general access structures subject to display quality constraints

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