Results 171 to 180 of about 635 (199)

A Novel (2, 2) Visual Secret Sharing without the Pixel Expansion

2015 International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP), 2015
Pixel expansion is a common drawback of traditional (2,2) visual secret sharing (VSS), unexpanded shares can decrease the bandwidth and save storage. In the literature, we introduce a novel (2,2) VSS scheme, that solved the pixel expansion and visual quality is almost equal with traditional (2,2) VSS.
Xin Liu, Shen Wang 0004, Weizhe Zhang, Xiamu Niu   +3 more
openaire   +1 more source

Research on Pixel Expansion of (2,n) Visual Threshold Scheme

2006 First International Symposium on Pervasive Computing and Applications, 2006
Two parameters, pixel expansion and contrast, are very important in visual cryptography. It 's very difficult to optimize both of them in theory. Based on combination, A (2, n) scheme, which existence has been proved theoretically, has been proposed in this paper. Meantime, the method of construct has been carried out.
Liguo Fang, Bin Yu
openaire   +1 more source

(2,3) RIVC Scheme in Visual Cryptography without Pixel Expansion

2013 2nd International Conference on Advanced Computing, Networking and Security, 2013
Region Incrementing Visual Cryptography (RIVC) was first introduced by R Z Wang in 2009. (2, n) region incrementing visual cryptographic scheme gradually reconstructs the secrets in a single image with multiple security levels. But Wang's scheme suffers from color reversal and pixel expansion.
Anila Thankappan, M. Wilscy
exaly   +2 more sources

A (2,2) XOR-based visual cryptography scheme without pixel expansion

Journal of Visual Communication and Image Representation, 2019
Abstract Visual cryptography (VC) is a technique that encodes the content of a secret image into two or more images, which are called shares. These shares are printed on transparencies and superimposed to reveal the original secret image. Frequently, VC techniques require a pixel expansion and a good alignment, which reduces the final spatial ...
Max E. Vizcarra Melgar, Mylène C. Q. Farias   +1 more
openaire   +1 more source

A Cheat-Prevention Visual Secret Sharing Scheme with Minimum Pixel Expansion

2014
A visual secret sharing (VSS) scheme with minimum pixel expansion is proposed to prevent malicious participants from deceiving an honest participant. A VSS scheme encrypts a secret image into pieces referred to as shares where each participant keeps a share so that stacking sufficient number of shares recovers the secret image.
Shenchuan Liu, Masaaki Fujiyoshi, Hitoshi Kiya   +2 more
openaire   +1 more source

Secure telemedicine using RONI halftoned visual cryptography without pixel expansion

Journal of Information Security and Applications, 2019
Abstract To provide quality healthcare services worldwide telemedicine is a well-known technique. It delivers healthcare services remotely. For the diagnosis of disease and prescription by the doctor, lots of information is needed to be shared over public and private channels. Medical information like MRI, X-Ray, CT-scan etc.
Arvind Bakshi, Anoop Kumar Patel
openaire   +1 more source

A cheat preventing method with efficient pixel expansion for Naor-Shamir's visual cryptography

2014 IEEE International Conference on Image Processing (ICIP), 2014
This paper proposes a cheat-prevention method of visual cryptography (VC) for binary images. A VC technique encrypts a secret image into images referred to as shares so that stacking sufficient shares recovers the secret image, where shares are kept by different parties. The proposed method prevents malicious parties from deceiving an honest party, i.e.
Shenchuan Liu, Masaaki Fujiyoshi, Hitoshi Kiya   +2 more
openaire   +1 more source

An Improved Reversible Watermarking Based on Pixel Value Ordering and Prediction Error Expansion

2020
In this paper, a new pixel value ordering (PVO) and prediction error Expansion (PEE) based reversible watermarking method is proposed. PVO based method firstly introduced by Li et al.’s has been concerned and expanded because it can achieve high embedding capacity without losing the implication of the cover.
Le Quang Hoa, Cao Thi Luyen, Nguyen Kim Sao, Pham Van At   +3 more
openaire   +1 more source

Visual secret sharing scheme: prioritizing the secret pixels with different pixel expansions to enhance the image contrast

Optical Engineering, 2007
A visual secret sharing (VSS) scheme is a secret image sharing scheme that divides a secret pixel into several subpixels (the number of subpixels is called the pixel expansion). The secret image encrypted by the VSS technique can be visually revealed without additional computations.
openaire   +1 more source

Cheating Immune Visual Cryptographic Scheme with Reduced Pixel Expansion

2018
One of the drawbacks in visual cryptography is cheating attacks, where the malicious adversaries can cheat the honest participant by submitting fake shares during reconstruction phase. Cheating immune visual cryptographic schemes are used for mitigating cheating attacks in visual cryptography.
Kanakkath Praveen, M. Sethumadhavan
openaire   +1 more source