Opto-Electronics Review

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A novel data hiding and reversible scheme using SMN blocks in VQ-compressed images
Opto-Electronics Review - Tập 19 - Trang 225-233 - 2011
C. -T. Huang, W. -J. Wang, S. -J. Wang
Data hiding is a technique for embedding secret data into cover media. It is important to multimedia security and has been widely studied. Reversible data hiding methods are becoming prevalent in the area because they can reconstruct the original cover image while extracting the embedded data. In this paper, we propose a new reversible method for vector quantization (VQ) compressed images. Our met...... hiện toàn bộ
Direct measurement of group dispersion of optical components using white-light spectral interferometry
Opto-Electronics Review - Tập 15 - Trang 144-148 - 2007
R. Chlebus, P. Hlubina, D. Ciprian
We present a simple white-light spectral interferometric technique employing a low-resolution spectrometer for a direct measurement of the group dispersion of optical components over a wide wavelength range. The technique utilizes an unbalanced Mach-Zehnder interferometer with a component under test inserted in one arm and the other arm with adjustable path length. We record a series of spectral i...... hiện toàn bộ
Simplified coupling power model for fibers fusion
Opto-Electronics Review - Tập 17 - Trang 193-199 - 2009
J. Saktioto, J. Ali, M. Fadhali
Fiber coupler fabrication used for an optical waveguide requires lossless power for an optimal application. The previous research coupled fibers were successfully fabricated by injecting hydrogen flow at 1 bar and fused slightly by unstable torch flame in the range of 800–1350°C. Optical parameters may vary significantly over wide range physical properties. Coupling coefficient and refractive inde...... hiện toàn bộ
Ion etching of HgCdTe: Properties, patterns and use as a method for defect studies
Opto-Electronics Review - Tập 25 - Trang 148-170 - 2017
I.I. Izhnin, K.D. Mynbaev, A.V. Voitsekhovskii, A.G. Korotaev, O.I. Fitsych, M. Pociask-Bialy
Comparative electrooptic study of new orthoconic liquid crystals with fluorinated alkoxy terminal chains
Opto-Electronics Review - Tập 18 - Trang 219-222 - 2010
A. Spadło, E. Otón, R. Dąbrowski, M. Żurowska, J. M. Otón, N. Bennis
Electrooptical properties of several new orthoconic antiferroelectric liquid crystal mixtures with partially fluorinated alkoxyalkoxy terminal chains have been investigated in order to select the best mixture for display applications. Electrooptical studies have been performed on these orthoconic materials aiming at evaluating their static and dynamic performance under passive multiplexing conditi...... hiện toàn bộ
Numerical elimination methods of ITO cell contribution to dielectric spectra of ferroelectric liquid crystals
Opto-Electronics Review - Tập 19 - Trang 176-182 - 2011
P. Perkowski
Indium tin oxide (ITO) electrodes are widely used for liquid crystal applications as well as for measuring cells. Unfortunately, ITO layer possesses its own non zero resistivity R which produces (with the capacity C) the cut-off frequency f0 of RC circuit. Dielectric spectroscopy cannot be performed for high frequencies because of high frequency losses caused by the cell behaviour. Four procedures...... hiện toàn bộ
Study of anchoring characteristics and splay-bend elastic constant based on experiments with non-twisted nematic liquid crystal cells
Opto-Electronics Review - Tập 16 - Trang 390-394 - 2008
J. Kędzierski, M. A. Kojdecki, Z. Raszewski, J. Rutkowska, W. Piecek, P. Perkowski, J. Zieliński, E. Miszczyk
Possible influence of a nematics splay-bend elastic constant and corresponding free energy functional term on adequacy of description of nematics states is studied by comparing results of theoretical considerations and computer simulations with experimental data. Planar deformation states enforced in flat nematics cells by symmetric aligning cover coatings and external electric or magnetic fields ...... hiện toàn bộ
A new multi-path scheme for adaptive computation-aware motion estimation
Opto-Electronics Review - Tập 15 - Trang 118-124 - 2007
M. Jakubowski, G. Pastuszak
Ability to work in a computation-limited and computation-variant environment described as “computational awareness” is a desirable feature of a real-time motion estimation system. In this paper, a new multi-path computation-aware algorithm is proposed. One-pass scheme, presented in the prior work by Chen et al., considers only one candidate point which is the median of neighbouring motion vectors ...... hiện toàn bộ
Technology and characterisation of GaAsN/GaAs heterostructures for photodetector applications
Opto-Electronics Review - Tập 16 - Trang 1-7 - 2007
B. Ściana, I. Zborowska-Lindert, D. Pucicki, B. Boratyński, D. Radziewicz, M. Tłaczała, J. Serafińczuk, P. Poloczek, G. Sęk, J. Misiewicz
The nitrogen-containing conventional AIIIBV semiconductor alloys, so-called diluted nitrides (AIIIBV-N), have been extensively studied recently. Unusual properties of these materials make them very promising for applications in lasers and very efficient multijunction solar cells. This work presents the technology and properties of undoped GaAs1-xNx/GaAs heterostructures used as active regions in t...... hiện toàn bộ
Junction configurations and their impacts on Cu(In,Ga)Se2 based solar cells performances
Opto-Electronics Review - Tập 27 - Trang 70-78 - 2019
N. Guirdjebaye, S. Ouédraogo, A. Teyou Ngoupo, G.L. Mbopda Tcheum, J.M.B. Ndjaka
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