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A No-Reference Sharpness Metric Based on Structured Ringing for JPEG2000 Images 基于结构化环的JPEG2000图像无参考清晰度度量
Advances in Optical Technologies Pub Date : 2014-06-24 DOI: 10.1155/2014/295615
Zhipeng Cao, Zhenzhong Wei, Guangjun Zhang
{"title":"A No-Reference Sharpness Metric Based on Structured Ringing for JPEG2000 Images","authors":"Zhipeng Cao, Zhenzhong Wei, Guangjun Zhang","doi":"10.1155/2014/295615","DOIUrl":"https://doi.org/10.1155/2014/295615","url":null,"abstract":"This work presents a no-reference image sharpness metric based on human blur perception for JPEG2000 compressed image. The metric mainly uses a ringing measure. And a blurring measure is used for compensation when the blur is so severe that ringing artifacts are concealed. We used the anisotropic diffusion for the preliminary ringing map and refined it by considering the property of ringing structure. The ringing detection of the proposed metric does not depend on edge detection, which is suitable for high degraded images. The characteristics of the ringing and blurring measures are analyzed and validated theoretically and experimentally. The performance of the proposed metric is tested and compared with that of some existing JPEG2000 sharpness metrics on three widely used databases. The experimental results show that the proposed metric is accurate and reliable in predicting the sharpness of JPEG2000 images.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127517716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Implementation of a One-LLID-per-Queue DBA Algorithm in EPON EPON中一列一列DBA算法的实现
Advances in Optical Technologies Pub Date : 2014-05-25 DOI: 10.1155/2014/376195
N. Radzi, N. M. Din, M. Al-Mansoori, H. Z. Abidin
{"title":"Implementation of a One-LLID-per-Queue DBA Algorithm in EPON","authors":"N. Radzi, N. M. Din, M. Al-Mansoori, H. Z. Abidin","doi":"10.1155/2014/376195","DOIUrl":"https://doi.org/10.1155/2014/376195","url":null,"abstract":"The advantages of Ethernet passive optical network (EPON) are setting it to be a natural ubiquitous solution for the access network. In the upstream direction of EPON, the directional property of the splitter requires that the traffic flow be mitigated to avoid collision. A dynamic bandwidth allocation (DBA) scheme is desirable in optimizing the bandwidth usage further. In this paper, a global priority DBA mechanism is discussed. The mechanism aims to reduce the overall delay while enhancing the throughput and fairness. This study was conducted using MATLAB where it was compared to two other algorithms in the literature. The results show that the delay is reduced up to 59% and the throughput and fairness index are improved up to 10% and 6%, respectively.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125396588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Band Structure Engineering in 2D Photonic Crystal Waveguide with Rhombic Cross-Section Elements 菱形截面元二维光子晶体波导的能带结构工程
Advances in Optical Technologies Pub Date : 2014-05-12 DOI: 10.1155/2014/780142
A. Gharaati, S. H. zahraei
{"title":"Band Structure Engineering in 2D Photonic Crystal Waveguide with Rhombic Cross-Section Elements","authors":"A. Gharaati, S. H. zahraei","doi":"10.1155/2014/780142","DOIUrl":"https://doi.org/10.1155/2014/780142","url":null,"abstract":"Two-dimensional photonic crystal (2D PhC) waveguides with square lattice composed of dielectric rhombic cross-section elements in air background, by using plane wave expansion (PWE) method, are investigated. In order to study the change of photonic band gap (PBG) by changing of elongation of elements, the band structure of the used structure is plotted. We observe that the size of the PBG changes by variation of elongation of elements, but there is no any change in the magnitude of defect modes. However, the used structure does not have any TE defect modes but it has TM defect mode for any angle of elongation. So, the used structure can be used as optical polarizer.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131089896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Demonstration of Controlling the Spatiotemporal Dynamics of Optical Near-Field Excitation Transfer in Y-Junction Structure Consisting of Randomly Distributed Quantum Dots 随机分布量子点组成的y结结构中光近场激发转移的时空动力学控制论证
Advances in Optical Technologies Pub Date : 2014-04-27 DOI: 10.1155/2014/569684
W. Nomura, M. Naruse, M. Aono, Song-Ju Kim, T. Kawazoe, T. Yatsui, M. Ohtsu
{"title":"Demonstration of Controlling the Spatiotemporal Dynamics of Optical Near-Field Excitation Transfer in Y-Junction Structure Consisting of Randomly Distributed Quantum Dots","authors":"W. Nomura, M. Naruse, M. Aono, Song-Ju Kim, T. Kawazoe, T. Yatsui, M. Ohtsu","doi":"10.1155/2014/569684","DOIUrl":"https://doi.org/10.1155/2014/569684","url":null,"abstract":"Solution searching devices that operate on the basis of controlling the spatiotemporal dynamics of excitation transfer via dressed photon interactions between quantum dots have been proposed. Long-range excitation transfer based on dressed photon interactions between randomly distributed quantum dots is considered to be effective in realizing such devices. Here, we successfully controlled the spatiotemporal dynamics of excitation transfer using a Y-junction structure consisting of randomly dispersed CdSe/ZnS core-shell quantum dots. This Y-junction structure has two “output ends” and one “tap end.” By exciting one output end with control light, we observed increased excitation transfer to the other output end via a state-filling effect. Conversely, we observed reduced excitation transfer to the output ends by irradiating the tap end with control light, due to excitation of defect levels in the tap end. These results show the possibility of controlling the optical excitation transfer dynamics between multiple quantum dots.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125113018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tunability of Triangular SRR and Wire Strip (TSRR-WS) Metamaterial at THz 三角形SRR和线带(TSRR-WS)超材料在太赫兹波段的可调谐性
Advances in Optical Technologies Pub Date : 2014-04-27 DOI: 10.1155/2014/405301
P. Dawar, A. De
{"title":"Tunability of Triangular SRR and Wire Strip (TSRR-WS) Metamaterial at THz","authors":"P. Dawar, A. De","doi":"10.1155/2014/405301","DOIUrl":"https://doi.org/10.1155/2014/405301","url":null,"abstract":"This paper adumbrates a novel tunable metamaterial consisting of triangular split ring resonator (TSRR) and wire strip (WS) at THz frequency. Ansoft high frequency structure simulator (HFSS) has been used to design and analyse the metamaterial having Rogers RT/duroid 5870 ( = 2.33) and FR4 ( = 4.4) as substrate material. Nicolson Ross Weir (NRW) method has been used to retrieve the material parameters from transmission and reflection coefficient. 4% maximization has been obtained in the location of the negative region (or resonance frequency for permeability) by using FR4 with 0.75 μm instead of 1.25 μm as substrate thickness. In addition, 18% minimization has been achieved by using FR4 with 0.25 μm instead of RT/duroid 5870 substrate with the same thickness. Tunability has been proved by showing dependence of resonant frequency over the substrate thickness and substrate material.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122357389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A Potential Candidate for Lamp Phosphor: Eu3+ Activated K2Y2B2O7 灯用荧光粉的候选材料:Eu3+活化的K2Y2B2O7
Advances in Optical Technologies Pub Date : 2014-04-10 DOI: 10.1155/2014/706459
K. A. Koparkar, N. Bajaj, S. Omanwar
{"title":"A Potential Candidate for Lamp Phosphor: Eu3+ Activated K2Y2B2O7","authors":"K. A. Koparkar, N. Bajaj, S. Omanwar","doi":"10.1155/2014/706459","DOIUrl":"https://doi.org/10.1155/2014/706459","url":null,"abstract":"The novel phosphor K2Y2B2O7 doped with europium is studied for its photoluminescence properties. The studies show that the phosphor gives strong red emission (PL) at 613 nm related to 5D0-7F2 transition of Eu3","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131735112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Electromagnetic Imaging of Two-Dimensional Geometries by Multipulse Interference Using the Inverse FDTD Method 多脉冲干涉二维几何图形电磁成像的FDTD反演方法
Advances in Optical Technologies Pub Date : 2014-03-31 DOI: 10.1155/2014/529563
N. Okada, J. B. Cole
{"title":"Electromagnetic Imaging of Two-Dimensional Geometries by Multipulse Interference Using the Inverse FDTD Method","authors":"N. Okada, J. B. Cole","doi":"10.1155/2014/529563","DOIUrl":"https://doi.org/10.1155/2014/529563","url":null,"abstract":"The size, shape, and location of unknown objects in the ground and in the body can be estimated by an \u0000electromagnetic imaging technique. An imaging approach to clear detection of two-dimensional geometries is \u0000proposed in this paper. Based on the inverse finite-difference time-domain (FDTD) method, a phase interference \u0000technique using multidirectional pulses is employed. The advantage of the proposed method is that it can clearly \u0000reconstruct the geometry in a simple calculation. Sample imaging results are demonstrated. The analysis of the \u0000FDTD results shows that the detectable object size is limited by the incident wavelength and the measurement \u0000spacing and illustrates the detectability of multiple objects.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121492277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Role of Density Profiles for the Nonlinear Propagation of Intense Laser Beam through Plasma Channel 密度分布在强激光束通过等离子体通道非线性传播中的作用
Advances in Optical Technologies Pub Date : 2014-03-23 DOI: 10.1155/2014/472740
Sonu Sen, M. Varshney, D. Varshney
{"title":"Role of Density Profiles for the Nonlinear Propagation of Intense Laser Beam through Plasma Channel","authors":"Sonu Sen, M. Varshney, D. Varshney","doi":"10.1155/2014/472740","DOIUrl":"https://doi.org/10.1155/2014/472740","url":null,"abstract":"In this work role of density profiles for the nonlinear propagation of intense laser beam through plasma channel is analyzed. By employing the expression for the dielectric function of different density profile plasma, a differential equation for beamwidth parameter is derived under WKB and paraxial approximation. The laser induces modifications of the dielectric function through nonlinearities. It is found that density profiles play vital role in laser-plasma interaction studies. To have numerical appreciation of the results the propagation equation for plasma is solved using the fourth order Runge-Kutta method for the initial plane wave front of the beam, using boundary conditions. The spot size of the laser beam decreases as the beam penetrates into the plasma and significantly adds self-focusing in plasma. This causes the laser beam to become more focused by reduction of diffraction effect, which is an important phenomenon in inertial confinement fusion and also for the understanding of self-focusing of laser pulses. Numerical computations are presented and discussed in the form of graphs for typical parameters of laser-plasma interaction.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129661133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
All-Optical Logic Gates: Designs, Classification, and Comparison 全光逻辑门:设计、分类与比较
Advances in Optical Technologies Pub Date : 2014-03-19 DOI: 10.1155/2014/275083
Pallavi Singh, D. Tripathi, Shikha Jaiswal, H. K. Dixit
{"title":"All-Optical Logic Gates: Designs, Classification, and Comparison","authors":"Pallavi Singh, D. Tripathi, Shikha Jaiswal, H. K. Dixit","doi":"10.1155/2014/275083","DOIUrl":"https://doi.org/10.1155/2014/275083","url":null,"abstract":"The paper reviews the current status and designs of all-optical gates. Various schemes with and without semiconductor optical amplifiers are discussed and compared. The optical gates are classified according to their design structures. It is divided into two major divisions that is, nonsemiconductor optical amplifier based gates and semiconductor optical amplifier based gates. In nonsemiconductor optical amplifier based gates, different schemes have been proposed to create non-linearity which is discussed. The semiconductor optical amplifier based gates of different design structures are discussed to show the probe pulse that is modulated in different ways to obtain results.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123354474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 108
Dynamic Range Analysis of the Phase Generated Carrier Demodulation Technique 相位产生载波解调技术的动态范围分析
Advances in Optical Technologies Pub Date : 2014-03-17 DOI: 10.1155/2014/815108
M. J. Plotnikov, A. V. Kulikov, V. Strigalev, I. Meshkovsky
{"title":"Dynamic Range Analysis of the Phase Generated Carrier Demodulation Technique","authors":"M. J. Plotnikov, A. V. Kulikov, V. Strigalev, I. Meshkovsky","doi":"10.1155/2014/815108","DOIUrl":"https://doi.org/10.1155/2014/815108","url":null,"abstract":"The dependence of the dynamic range of the phase generated carrier (PGC) technique on low-pass filters passbands is investigated using a simulation model. A nonlinear character of this dependence, which could lead to dynamic range limitations or measurement uncertainty, is presented for the first time. A detailed theoretical analysis is provided to verify the simulation results and these results are consistent with performed calculations. The method for the calculation of low-pass filters passbands according to the required dynamic range upper limit is proposed.","PeriodicalId":156432,"journal":{"name":"Advances in Optical Technologies","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134006968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
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