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Improving Image Quality In Extended Visual Cryptography For Halftone Images With No Pixel Expansion
[Full Text]
AUTHOR(S)
J. Tamilarasi, V. Vanitha, T. Renuka
KEYWORDS
Index Terms: extended visual cryptography, image processing, improving image quality, secret sharing, visual cryptography
ABSTRACT
Abstract: Visual cryptography is a secret sharing scheme that divides secret images into shares such that, when the shares are superimposed, a hidden secret image is revealed. In extended visual cryptography, an extra security is provided by giving cover images to the shares. However, in either case, loss of resolution, contrast, and image size expansion are challenging problems that the researchers are facing. In this paper, we propose a method for processing halftone images that improves the quality of the recovered images and also avoids pixel expansion. The resulting scheme maintains the perfect security of the original extended visual cryptography approach and also provides a better result.
REFERENCES
[1] M. Naor and A. Shamir, “Visual cryptography”, in EU-ROCRYPT ’94 Proceedings, Lecture Notes in Computer Science, Springer-Verlag, vol. 950, pp. 1-12, 1995.
[2] A. Ross and A. A. Othman, “Visual Cryptography for Biometric Privacy”, IEEE Transactions on Information Forensics and Security, vol. 6, no. 1, pp. 70-81, 2011.
[3] N. Askari, C. Moloney and H.M. Heys,“A Novel Visual Secret Sharing Scheme Without Image Size Expansion”,
IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Montreal, pp. 1-4, 2012.
[4] G. Ateniese, C. Blundo, A. De Santis and D.R. Stinson, “Extended Capabilities for Visual Cryptography”, The-oretical Computer Science, vol. 250, pp. 143-161, 2001.
[5] R. W. Floyd and L. Steinberg, “An Adaptive Algorithm for Spatial Gray Scale”, in Proceedings of the Society for Information Display, vol.17, no. 2, pp.75-77, 1976.
[6] Z. Zhou, G.R. Arce, and G. Di Crescenzo, “Halftone Vi-sual Cryptography”, IEEE Transactions on Image Pro-cessing, vol. 15, no. 8, pp. 2441-2451, 2006.
[7] M. Nakajima and Y. Yamaguchi, Extended Visual Cryp-tography for Natural Images, in Proceeedings of WSCG, pp. 303-310, 2002.
[8] C.L. Chou,“A Watermarking Technique Based on Non-expansible Visual Cryptography”, Thesis, Department of Information Management, National University, Tai-wan, 2002.
[9] C.C. Wu and L.H. Chen, “A Study on Visual Cryptog-raphy”, Thesis, Institute of Computer and Information Science, National Chiao Tung University, Taiwan, 1998.
[10] N. Askari, H.M. Heys, C.R. Moloney, “An extended Visual Cryptography Scheme without Pixel Expansion for Halftone Images” IEEE Canadian Conference on Electrical and Computer Engineering (CCECE),2013.
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