Optimal Contrast Grayscale Visual Cryptography Schemes With Reversing

Optimal Contrast Grayscale Visual Cryptography Schemes With Reversing
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具有可逆性的最佳对比度灰度视觉密码方案

DOI:
10.1109/tifs.2013.2281108
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发表时间:
2012-10
期刊:
IEEE Transaction on Information Forensics and Security
影响因子:
--
通讯作者:
Chingnung Yang
Chingnung Yang
中科院分区:
其他
文献类型:
--
作者:
Daoshun Wang;Tao Song;Lin Dong;Chingnung Yang

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视觉密码方案(visual cryptography scheme,缩写为JPEG)是一种利用人类视觉系统恢复秘密图像的加密技术,它不需要任何复杂的计算。然而,重建图像的对比度可能相当低。已经提出了许多基于反转的VCS(或具有反转的VCS)(RCS)用于二进制秘密图像,允许参与者对份额(或阴影)执行反转操作。这种反转操作可以很容易地通过现有的复印机来实现。将现有的一些传统的无反转图像增强算法(nRightswithout reversing,nRightsing)推广到二值图像的Rightsing上,并采用相同的像素扩展,得到的Rightsing可以达到理想的对比度,明显高于相应的nRightsing。在灰度图像的应用中,对比度远低于二值图像的对比度。因此,在灰度图像重构中更期望提高对比度。然而,当涉及灰度图像时,不能如此容易地利用这种反转操作。许多现有的灰度nRectangle不能直接扩展到Rectangle。本文首先给出了一种新的具有最小像素扩展的灰度nR_n,并利用完全黑nR_n的基矩阵提出了一种最佳对比度灰度R_n(GRR_n)。此外,我们提出了一个最佳的GRID,即使基矩阵不是完美的黑色。最后,我们设计了一个最优对比度GRUNK,每个参与者持有的股份数最少。所提出的方案可以满足不同的用户需求,以前的RVCS的二值图像可以被视为特殊情况下,在这里提出的计划。
The visual cryptography scheme (VCS) is an encryption technique that utilizes the human visual system in recovering a secret image and it does not require any complex calculation. However, the contrast of the reconstructed image could be quite low. A number of reversing-based VCSs (or VCSs with reversing) (RVCS) have been proposed for binary secret images, allowing participants to perform a reversing operation on shares (or shadows). This reversing operation can be easily implemented by current copy machines. Some existing traditional VCS schemes without reversing (nRVCS) can be extended to RVCS with the same pixel expansion for binary image, and the RVCS can achieve ideal contrast, significantly higher than that of the corresponding nRVCS. In the application of grayscale VCS, the contrast is much lower than that of the binary cases. Therefore, it is more desirable to improve the contrast in the grayscale image reconstruction. However, when grayscale images are involved, one cannot take advantage of this reversing operation so easily. Many existing grayscale nRVCS cannot be directly extended to RVCS. In this paper, we first give a new grayscale nRVCS with minimum pixel expansion and propose an optimal-contrast grayscale RVCS (GRVCS) by using basis matrices of perfect black nRVCS. Also, we propose an optimal GRVCS even though the basis matrices are not perfectly black. Finally, we design an optimal-contrast GRVCS with a minimum number of shares held by each participant. The proposed schemes can satisfy different user requirements; previous RVCSs for binary images can be viewed as special cases in the schemes proposed here.
DOI: 10.1007/978-3-540-24660-2_27
发表时间: 2004-02
期刊: IACR Cryptol. ePrint Arch.
影响因子: --
作者:
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DOI: 10.1016/j.patcog.2006.11.018
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DOI: 10.1007/11767480_30
发表时间: 2006-06
期刊: --
影响因子: --
作者:
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DOI: 10.1093/comjnl/bxm118
发表时间: 2008-11
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影响因子: --
作者:
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通讯作者: Ching-Nung Yang;Chung-Chun Wang;Tse-Shih Chen