IEEE Trans Image Process - Image size invariant visual cryptography for general access structures subject to display quality constraints.

Tópicos

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Resumo

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 for general access structures. We propose a general and systematic approach to address these issues without sophisticated codebook design. This approach can be used for binary secret images in non-computer-aided decryption environments. To avoid pixel expansion, we design a set of column vectors to encrypt secret pixels rather than using 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 show that the display quality of the recovered image is superior to that of previous papers.

Resumo Limpo

convent visual cryptographi vc suffer pixelexpans problem uncontrol display qualiti problem recov imag lack general approach construct visual secret share scheme general access structur propos general systemat approach address issu without sophist codebook design approach can use binari secret imag noncomputeraid decrypt environ avoid pixel expans design set column vector encrypt secret pixel rather use convent vcbase approach begin formul mathemat model vc construct problem find column vector optim vc construct develop simulatedannealingbas algorithm solv problem experiment result show display qualiti recov imag superior previous paper

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