Book ChapterDOI
Clarity Corresponding to Contrast in Visual Cryptography
Xuehu Yan,Yuliang Lu,Hui Huang,Lintao Liu,Song Wan +4 more
- pp 249-257
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TLDR
The clarity corresponding to contrast is investigated through conducting subjective evaluation scores and objective evaluation indexes, which can be extended to general applications.Abstract:
The visual quality of the recovered secret image is usually evaluated by contrast in visual cryptography (VC). Precisely, the reconstructed secret image can be recognized as the original secret image when contrast is greater than zero. It is important for the user to know the clarity of the revealed secret image corresponding to different contrast values. In this paper, the clarity corresponding to contrast is investigated through conducting subjective evaluation scores and objective evaluation indexes, which can be extended to general applications.read more
Citations
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Journal ArticleDOI
General Meaningful Shadow Construction in Secret Image Sharing
Xuehu Yan,Yuliang Lu,Lintao Liu +2 more
TL;DR: This paper designs a general SIS construction method with meaningful shadow and no pixel expansion, by which and some classic SIS techniques with meaningless (noise-like) shadow some SIS algorithms with meaningfulShadow are derived.
Journal ArticleDOI
Participants increasing for threshold random grids-based visual secret sharing
Xuehu Yan,Yuliang Lu +1 more
TL;DR: This paper considers the new participants increasing issue as well as proposing a participants increasing method only from the n original shadow images generated by previous existed (k, n) threshold random grids-based visual secret sharing (RGVSS).
Journal ArticleDOI
Contrast-improved visual secret sharing based on random grid for general access structure
Xuehu Yan,Yuliang Lu +1 more
TL;DR: A progressive VSS (PVSS) algorithm for GAS with improved visual quality based on RG that has neither pixel expansion nor codebook design due to RG is developed.
Proceedings ArticleDOI
Visual Secret Sharing Scheme with (k, n) Threshold Based on QR Codes
TL;DR: The proposed visual secret sharing scheme based on QR codes (VSSQR) can visually reveal secret image by stacking k or more shares from all the n QR codes as well as scan the QR code by a QR code reader.
Journal ArticleDOI
Applying Visual Cryptography to Enhance Text Captchas
TL;DR: Using the features of the randomness for each encoding process in visual cryptography and the visual recognizability with naked human eyes, VC is applied to design and enhance text-based captcha (VCETC), and the recognition rate is in some degree decreased.
References
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Visual Cryptography
Moni Naor,Adi Shamir +1 more
TL;DR: In this paper, a new type of cryptographic scheme, which can decode concealed images without any cryptographic computations, is proposed, which is called k-out-of-n secret sharing.
Journal ArticleDOI
Visual Cryptography for General Access Structures
TL;DR: This paper examines graph-based access structures, i.e., access structures in which any qualified set of participants contains at least an edge of a given graph whose vertices represent the participants of the scheme, and provides a novel technique for realizing threshold visual cryptography schemes.
Journal ArticleDOI
Visual cryptography for color images
TL;DR: Three methods for visual cryptography of gray-level and color images based on past studies in black-and-white visual cryptography, the halftone technology, and the color decomposition method are proposed.
Journal ArticleDOI
New visual secret sharing schemes using probabilistic method
TL;DR: The frequency of white pixels is used to show the contrast of the recovered image and the scheme is nonexpansible and can be easily implemented on a basis of conventional VSS scheme.
Journal ArticleDOI
Reversible Image Watermarking Based on Integer-to-Integer Wavelet Transform
TL;DR: The experimental results show that the proposed scheme achieves higher embedding capacity while maintaining distortion at a lower level than the existing reversible watermarking schemes.