Visual Secret Sharing Scheme: Improving the Contrast of a Recovered Image Via Different Pixel Expansions

Visual secret sharing (VSS) scheme is an image sharing scheme that divides a secret pixel into several sub pixels (the number of sub pixels is called the pixel expansion) and the secret image is visually revealed without additional computations. However the contrast of recovered image is poor and thus the VSS framework is always a research issue and not a practical scheme. In this paper, we introduce a new framework which prioritizes the pixels with different pixel expansions to reconstruct a high-quality image for practical use. Also, integrating the optical character recognition with the proposed VSS scheme we show a new automated visual authentication scheme.

[1]  H. Kuwakado,et al.  Size-Reduced Visual Secret Sharing Scheme( Discrete Mathematics and Its Applications) , 2004 .

[2]  R. Ito,et al.  Image Size Invariant Visual Cryptography , 1999 .

[3]  Ching-Nung Yang,et al.  New Size-Reduced Visual Secret Sharing Schemes with Half Reduction of Shadow Size , 2006, IEICE Trans. Fundam. Electron. Commun. Comput. Sci..

[4]  Young-Chang Hou,et al.  A Visual Cryptographic Technicque for Chromatic Images Using Multi-Pixel Encoding Method , 2005, J. Res. Pract. Inf. Technol..

[5]  Rastislav Lukac,et al.  Digital image indexing using secret sharing schemes: a unified framework for single-sensor consumer electronics , 2005, IEEE Transactions on Consumer Electronics.

[6]  Stelvio Cimato,et al.  Probabilistic Visual Cryptography Schemes , 2006, Comput. J..

[7]  Hirotsugu Yamamoto,et al.  Securing information display by use of visual cryptography. , 2003, Optics letters.

[8]  Ching-Nung Yang,et al.  New visual secret sharing schemes using probabilistic method , 2004, Pattern Recognit. Lett..

[9]  Ching-Nung Yang,et al.  New Aspect Ratio Invariant Visual Secret Sharing Schemes Using Square Block-Wise Operation , 2005, ICIAR.

[10]  Eric R. Verheul,et al.  Constructions and Properties of k out of n Visual Secret Sharing Schemes , 1997, Des. Codes Cryptogr..

[11]  Marten van Dijk,et al.  Visual Crypto Displays Enabling Secure Communications , 2003, SPC.

[12]  Douglas R. Stinson,et al.  Threshold Visual Cryptography Schemes with Specified Whiteness Levels of Reconstructed Pixels , 2002, Des. Codes Cryptogr..

[13]  Moni Naor,et al.  Visual Authentication and Identification , 1997, CRYPTO.

[14]  J. Todd.  Book Review: Digital image processing (second edition). By R. C. Gonzalez and P. Wintz, Addison-Wesley, 1987. 503 pp. Price: £29.95. (ISBN 0-201-11026-1) , 1988 .

[15]  Moni Naor,et al.  Visual Cryptography , 1994, Encyclopedia of Multimedia.