Showing papers in "Optik in 2013"

TL;DR: The simulation experimental results and security analysis show that the algorithm not only has good encryption effect, but also has the ability of resisting exhaustive attack and statistical attack.

TL;DR: From the result analysis, FSO wavelength with 1550 nm produces less effect in atmospheric attenuation, and it is recommended to develop a system of quality-free space optics for a high data rate transmission.

TL;DR: A new spatiotemporal chaotic system is introduced by defining the local nonlinear map in the CML with the nonlinear chaotic algorithm (NCA) chaotic map, and an image encryption scheme with the permutation-diffusion mechanism based on these chaotic maps is proposed.

TL;DR: A new scheme for automated FDDS implementation using GLCM is presented and also a comparison with Gabor filter approach, which produces higher defect detection accuracies than Gabor Filter approach and more computationally efficient.

TL;DR: A novel extension of bi-histogram equalization referred to as Range Limited Bi-Histogram Equalization (RLBHE), which has better performance than the existing methods, and preserve the original brightness quite well, so that it is possible to be utilized in consumer electronic products.

TL;DR: A hybrid method of principal component analysis and local binary pattern (LBP) is introduced, which can classify different expressions more effectively and can get higher recognition rate than the traditional recognition methods.

TL;DR: In this paper, a new design of channel drop filters based on photonic crystals ring resonators (PCRRs) is presented, and the filter characteristics for single-ring and dual-ring configurations based on 2D triangular lattice photonic crystal (PC) silicon rods have been investigated by using the two-dimensional (2D) finite difference time-domain (FDTD) method.

TL;DR: In this paper, a method of photonic crystal filter using resonant cavities in two-dimensional structures suitable for WDM and DWDM communication applications is proposed, and the desired wavelengths with characteristics according to ITU-T standard is shown.

TL;DR: Numerical experiments show that this image information encryption scheme has following features: low data volume for encryption and high security of information.

TL;DR: Experimental results show that the proposed novel blind watermarking algorithm not only can resist both traditional signal processing attacks and geometric attacks, but also has more efficient in computational complexity.

TL;DR: In this article, a 4-channel wavelength division demultiplexer based on photonic crystal structures suitable for WDM communication applications is proposed, where four scattering rods above and under the X-shaped ring resonators in the proposed structure are introduced to improve the wavelength selectivity.

TL;DR: The simulation experimental results and security analysis show that the novel couple images encryption algorithm not only has good encryption effect, but also has the ability of resisting exhaustive attack and statistical attack.

TL;DR: Experimental results and security analysis show that the scheme not only can achieve good encryption result and large key space, but also can resist against common attacks, so the scheme is reliable to be adopted for network security and secure communications.

TL;DR: First, dimensional reduction and random projection, the characteristics of compressed sensing, are utilized to compress and encrypt a digital image and Arnold transformation is used to scramble the encryption image followed by compressed sensing with low data volume.

TL;DR: The experimental results show that the proposed fusion approach is effective and can provide better performance in fusing multi-focus images than some current methods.

TL;DR: In this article, different modulation format RZ, CRZ, CSRZ and NRZ on free space optical communication system has been investigated and it has been observed that external modulation gave us better performance in comparison to direct modulation because direct NRZ spectrum has a strong carrier component compared to external modulated NRZ.

TL;DR: In this article, the authors theoretically analyzed adiabaticity criteria and optimal shapes for tapered fiber and found that a narrower taper waist can be achieved by using a small hot-zone length or increasing the elongation distance.

TL;DR: An implementation of a hybrid system consisting of a low-cost quadrotor and a small pushcart for autonomous visual tracking and landing on the moving carrier using only the relative pixel position in image plane without communication between the quadrotors and carrier.

TL;DR: In this paper, the performance of EDFA, RAMAN and SOA amplifiers was compared on the basis of transmission distance and dispersion with and without nonlinearities in 10Gbps WDM systems at 16, 32 and 64 channels.

TL;DR: A general review on the derivation of Clausius-Mossotti relation for gases and solids can be found in this article, where Clausius and Mossotti relation is used to connect the relative permittivity of a dielectric to the polarizability of the atoms or molecules constituting the dielectrics.

TL;DR: In this paper, a single crystal of potassium dichromate (KDC) has been grown from aqueous solution by slow evaporation technique and the lattice parameters of the grown crystal were determined by X-ray diffraction analysis.

TL;DR: In this paper, the optical properties of crosslinked chitosan thin film before and after contact with different concentration of Pb(II) ion in a range of 0.5-100 ppm had been obtained by fitting.

TL;DR: In this article, the fullpotential linear muffin-tin orbital (FP-LMTO) method was used to investigate the structural and electronic properties of half-Heusler alloys.

TL;DR: Average rain attenuation is evaluated from the collected rain intensity data which are collected for a period of seven months, and implemented in the study concerning results relating link distance, and received optical power of using multiple-beam FSO system in tropical rainy weather.

TL;DR: In this article, a new optical add-drop filter (OADF) based on two-dimensional photonic crystal ring resonator (2D PCRR) is proposed, where the filter is designed in 2D PC with triangular lattice of silicon rods in air.

TL;DR: In this paper, a four-channel wavelength demultiplexer based on photonic crystal ring resonators (PCRR), which can be used for photonic integrated circuits, is designed.

TL;DR: In this paper, a performance comparison of the conventional PIN photodiode with the Avalanche Photodiode (APD) in an optical communication system is presented, and the effects of bandwidth, gain, extinction ratio, shot noise and thermal noise are compared and studied in detail.

TL;DR: In this paper, the glow curve and kinetic parameters of Eu 3+ doped SrY 2 O 4 phosphor irradiated by beta source were reported and the corresponding kinetic parameters are calculated.

TL;DR: In this article, X-ray diffraction results showed that TiO 2 nanoparticles with grain size in the range of 21-24nm for anatase phase and 69-74nm for rutile phase have been obtained.

TL;DR: A novel method based on PCA image reconstruction and LDA for face recognition is proposed, where the inner-classes covariance matrix for feature extraction is used as generating matrix and eigenvectors from each person are obtained, then the reconstructed images are obtained.