New size-reduced visual secret sharing schemes with half reduction of shadow size

Authors:
Ching-Nung Yang;Tse-Shih Chen
Affiliations:
Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien, Taiwan;Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien, Taiwan
Venue:
ICCSA'05 Proceedings of the 2005 international conference on Computational Science and its Applications - Volume Part I
Year:
2005

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Abstract

Visual Secret Sharing (VSS) scheme proposed by Naor and Shamir is a perfect secure scheme to share the secret image. By using m subpixels to represent one pixel, the secret image is divided into several shadow images whose size is m times than the secret image. The value of m is known as the pixel expansion. In this paper, we propose the new size-reduced VSS schemes and dramatically decrease the pixel expansion to a half and meantime the contrast is not compromised.