Results 231 to 240 of about 1,949,204 (276)

Reversible data hiding using multi-pass pixel-value-ordering and pairwise prediction-error expansion

Information Sciences, 2018
Pixel value ordering (PVO) prediction can achieve remarkable accuracy and thus provide a rather sharp histogram. In addition, the efficiency in histogram manipulation also attracts much attention in recent works.
Wenguang He, Gangqiang Xiong, S. Weng, Z. Cai, Yaomin Wang   +4 more
semanticscholar   +1 more source

Efficient Reversible Watermarking Based on Adaptive Prediction-Error Expansion and Pixel Selection

IEEE Transactions on Image Processing, 2011
Prediction-error expansion (PEE) is an important technique of reversible watermarking which can embed large payloads into digital images with low distortion. In this paper, the PEE technique is further investigated and an efficient reversible watermarking scheme is proposed, by incorporating in PEE two new strategies, namely, adaptive embedding and ...
Li, Xiaolong, Yang, Bin, Zeng, Tieyong
openaire   +2 more sources

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

An extended secret sharing scheme for colour images with fixed pixel expansion

International Journal of Electronic Security and Digital Forensics, 2008
An extended visual secret sharing scheme uses multiple innocent-looking cover images to hide a secret image such that none discloses any portion of the secret. In this article, an extended secret sharing technique is proposed that shares a secret colour image in a couple of significant images using a fixed pixel expansion factor of 9 for a colour space
Rabia Sirhindi, Mehreen Afzal, Saeed Murtaza   +2 more
openaire   +1 more source

Optical information hiding system with pixel-free expansion visual cryptography

Journal of Optics
Abstract We propose an optical information hiding system with pixel-free expansion visual cryptography (PEVC). In the optical concealment process, initially, a PEVC scheme is utilized to encode the secret image. This approach generates visual keys of the same size as the secret image, addressing the pixel expansion issue inherent in ...
Ruize Liu, Chengzhe Wu, Changjun Ke, Yishi Shi   +3 more
openaire   +1 more source

Reversible watermarking schemes based on expansion embedding using pixel partition strategies

The Imaging Science Journal, 2012
Reversible watermarking methods have drawn attention of many researchers in recent years because original cover objects can be completely restored upon extraction of embedded information. The prediction error expansion (PEE) embedding proposed by Thodi and Rodriguez can embed one information bit into one cover pixel and achieve good visual quality of ...
T D Kieu, C-C Chang
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

High Capacity Reversible Data Hiding with Adjacent-Pixel-Based Difference Expansion

2009 Fourth International Conference on Innovative Computing, Information and Control (ICICIC), 2009
Data hiding has been an interesting research topic since the early 1990's. Among the hiding schemes, reversible data hiding has attracted more and more attention in both researches and applications. With reversible data hiding, at the data extraction stage, both the original content and the hidden message should be perfectly extracted, hence, how to ...
Hsiang-Cheh Huang, I-Hung Wang, Yuh-Yih Lu   +2 more
openaire   +1 more source

High capacity data hiding based on multi-directional pixel value differencing and decreased difference expansion

Multimedia tools and applications, 2021
P. Mandal, Imon Mukherjee
semanticscholar   +1 more source

Pure Inertia Optics – The Final Work: Unified Pixel Expansion Model

This work presents the final optical phase of the Pure Inertia Framework — a unified physical model where inertia, light, and cosmic expansion arise from the same dynamic process of pixel-level breathing.The study introduces the Unified Pixel Expansion Model, deriving redshift, lensing, and rotational dynamics from a single inertial parameter (mσ ...
openaire   +1 more source