• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

Improved Contrast for Threshold Random-grid-based Visual Cryptography

Vol. 12, No.7, July 31, 2018
10.3837/tiis.2018.07.022 , Download Paper (Free):

Abstract

Pixel expansion and contrast are two major performance parameters for visual cryptography scheme (VCS), which is a type of secret image sharing. Random Grid (RG) is an alternative approach to solve the pixel expansion problem. Chen and Tsao proposed the first (k, n) RGbased VCS, and then Guo et al., Wu et al., Shyu, and Yan et al. significantly improved the contrast in recent years. However, the investigations on improving the contrast of threshold RG-based VCS are not sufficient. In this paper, we develop a contrast-improved algorithm for (k, n) RG-based VCS. Theoretical analysis and experimental results demonstrate that the proposed algorithm outperformers the previous threshold algorithms with better visual quality and a higher accuracy of contrast.


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Cite this article

[IEEE Style]
Hao Hu, Gang Shen, Zhengxin Fu and Bin Yu, "Improved Contrast for Threshold Random-grid-based Visual Cryptography," KSII Transactions on Internet and Information Systems, vol. 12, no. 7, pp. 3401-3420, 2018. DOI: 10.3837/tiis.2018.07.022

[ACM Style]
Hu, H., Shen, G., Fu, Z., and Yu, B. 2018. Improved Contrast for Threshold Random-grid-based Visual Cryptography. KSII Transactions on Internet and Information Systems, 12, 7, (2018), 3401-3420. DOI: 10.3837/tiis.2018.07.022