Ecway Technologies provides IEEE projects and software developments with offices across multiple cities in India. They specialize in image size invariant visual cryptography for general access structures subject to display quality constraints. Their approach uses column vectors to encrypt secret pixels rather than conventional VC methods. They developed a mathematical model and simulated annealing algorithm to find optimal column vectors for construction without pixel expansion or uncontrollable display quality issues in recovered images. Experimental results showed superior recovered image quality over previous studies.

1. ECWAY TECHNOLOGIES
IEEE PROJECTS & SOFTWARE DEVELOPMENTS
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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.