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Visual cryptography schemes with optimal pixel expansion [PDF]

Theoretical Computer Science, 2006
A visual cryptography scheme encodes a black and white secret image into n shadow images called shares which are distributed to the n participants. Such shares are such that only qualified subsets of participants can "visually" recover the secret image ...
Carlo Blundo, Stelvio Cimato, Alfredo De Santis   +2 more
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Image Hatching for Visual Cryptography

2009 13th International Machine Vision and Image Processing Conference, 2009
Image hatching (or non-photorealistic line-art) is a technique widely applied in the printing or engraving of currency. Diverse styles of brush strokes have previously been adopted for different areas of an image to create textures and shading. Because there is no continuous tone within these types of images, we propose a multi-level scheme, which uses
Jonathan Weir, Wei Qi Yan 0001
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2D Barcodes for visual cryptography

Multimedia Tools and Applications, 2014
The basic idea of Visual Cryptography (VC) is to divide a secret image into several partitions which are called VC shares. With various categories of VC schemes having been developed to enhance the maturity of VC since its emergence, one of obsessions in current investigations of VC is that each VC share lacks authentication.
Guangyu Wang, Feng Liu 0001, Wei Qi Yan 0001   +2 more
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On the Randomness of Visual Cryptography Scheme

2013 Ninth International Conference on Intelligent Information Hiding and Multimedia Signal Processing, 2013
The randomness of visual cryptography scheme (VCS) measures at least how many random bits are required to encode a secret pixel. In this paper, the randomness of decomposition-based VCS proposed by Ateniese et al. is reduced significantly.
Teng Guo 0005, Feng Liu 0001, Chuan Kun Wu, YaWei Ren, Wen Wang 0008   +4 more
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Image hatching for visual cryptography

ACM Transactions on Multimedia Computing, Communications, and Applications, 2012
Image hatching (or nonphotorealistic line-art) is a technique widely used in the printing or engraving of currency. Diverse styles of brush strokes have previously been adopted for different areas of an image to create aesthetically pleasing textures and shading.
Jonathan Weir, WeiQi Yan 0001, Mohan S. Kankanhalli   +2 more
openaire   +2 more sources

Visual Cryptography Schemes with Reversing

The Computer Journal, 2008
The Visual cryptography scheme (VCS) is a perfect secure method that encrypts a secret image by breaking it into shadow images. A distinctive property of VCS is that one can visually, without computation, decode the secret by superimposing shadow images. However, much of the contrast of the reconstructed image is lost.
Ching-Nung Yang, Chung-Chun Wang, Tse-Shih Chen   +2 more
openaire   +1 more source

A Weighted Threshold Visual Cryptography

2019
Over the past years, a visual secret sharing scheme gave each share the same ability to reconstruct the secret image. That means each participant had the same significance to reveal the secret. However, it is not realistic in real world for some applications.
Tai-Yuan Tu, Tzung-Her Chen, Ji-Min Yang, Chih-Hung Wang   +3 more
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Collaborative Visual Cryptography Schemes

IEEE Transactions on Circuits and Systems for Video Technology, 2018
A ( $k,n$ )-conventional visual cryptography (VC) scheme is designed to share one secret and each participant takes one share. When some common participants are involved in multiple VC schemes for multiple secrets, each needs to take multiple shares. This procedure needs more shares, which is inconvenient.
Xingxing Jia, Daoshun Wang, Daxin Nie, Chaoyang Zhang   +3 more
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Visual Cryptography in reversible style

Third International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP 2007), 2007
We proposed in this paper a brand new type of visual cryptography (VC), namely, the VC in reversible style. For any two given secret images, two corresponding transparencies S1 and S2, also known as shares, can be produced. Both transparencies look noisy.
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Plane Transform Visual Cryptography

2011
Plane transformation visual cryptography takes a unique approach to some of the current shortcomings of current visual cryptography techniques. Typically, the direction and placement of the encrypted shares is critical when attempting to recover the secret. Many schemes are highly dependant on this stacking order.
Jonathan Weir, WeiQi Yan 0001
openaire   +1 more source