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conference on Visual information processing XIX

作者： Kelmelis, Eric J. Ortiz, Fernando E. Curt, Petersen F. Bodnar, Michael R. Spagnoli, Kyle E. Paolini, Aaron L. Price, Daniel K. EM Photon Inc Newark DE 19711 USA

ISBN: (纸本)9780819481658

Modern image enhancement techniques have been shown to be effective in improving the quality of imagery. However, the computational requirements of applying such algorithms to streams of video in real-time often cannot be satisfied by standard microprocessor-based systems. While a scaled solution involving clusters of microprocessors may provide the necessary arithmetic capacity, deployment is limited to data-center scenarios. What is needed is a way to perform these techniques in real time on embedded platforms. A new paradigm of computing utilizing special-purpose commodity hardware including Field-Programmable Gate Arrays (FPGAs) and Graphics processing Units (GPU) has recently emerged as an alternative to parallel computing using clusters of traditional CPUs. Recent research has shown that for many applications, such as image processing techniques requiring intense computations and large memory spaces, these hardware platforms significantly outperform microprocessors. Furthermore, while microprocessor technology has begun to stagnate, GPUs and FPGAs have continued to improve exponentially. FPGAs, flexible and powerful, are best targeted at embedded, low-power systems and specific applications. GPUs, cheap and readily available, are available to most users through their standard desktop machines. Additionally, as fabrication scale continues to shrink, heat and power consumption issues typically limiting GPU deployment to high-end desktop workstations are becoming less of a factor. The ability to include these devices in embedded environments opens up entire new application domains. In this paper, we investigate two state-of-the-art image processing techniques, super-resolution and the average-bispectrum speckle method, and compare FPGA and GPU implementations in terms of performance, development effort, cost, deployment options, and platform flexibility.

关键词： image processing real-time FPGA GPU parallel processing average-bispectrum speckle super-resolution

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Electrical pumping to iii-V layer from highly doped silicon micro wire to realize light emission by plasmaassisted bonding technology

Electrical pumping to III-V layer from highly doped silicon ...

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Indium Phosphide and Related Materials conference

作者： Ling-Han Li Ryo Takigawa Akio Higo Eiji Higurashi Masakazu Sugiyama Yoshiaki Nakano Research Center for Advanced Science and Technology University of Tokyo Japan Department of Electronic Engineering and Information Systems University of Tokyo Japan

The direct current pumping from highly doped silicon microwire to InP-based iii-V active layer for spontaneous light emission was realized by air ambient plasma-assisted direct bonding. The semi-conductive properties of the hetero-integration and the effects of plasma-assisted bonding process on InGaAsP multiple quantum well (MQW) were measured and discussed. The electrical pumping from silicon microwire to InGaAsP MQW material for spontaneous light emission was successfully demonstrated afterwards.

关键词： iii-V semiconductor materials Silicon Wire Bonding Quantum well devices Plasma materials processing Plasma measurements Plasma properties optical materials Plasma devices

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ORGAN: Online route and Wavelength design based on Genetic Algorithm for OPS networks

ORGAN: Online route and Wavelength design based on Genetic A...

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International conference on optical Network Design and Modeling, ONDM

作者： Hideki Tode Kazuki Hamada Koso Murakami Department of Computer Science and Information Systems Graduate School of Engineering Osaka Prefecture University Japan Department of Information Networking Graduation School of Information Science and Technology Osaka University Japan

ISBN: (纸本)9781424459735

OPS (optical packet switching) networks are considered as one of promising candidates for new generation network architecture. However, optical RAM has not been realized yet. Hence, high packet loss probability is a serious issue on feasible OPS networks. Now, there are some ways to solve this issue. The first approach is the usage of congestion avoidance devices like wavelength converter, fiber delay line , and so on, whereas the second one is the adaptive learning based method like priority-based wavelength assignment (PWA), and suitability index method, and so on. These ways, however, focus on OBS (optical burst switching) network where burst-by-burst success or failure results on signaling messages can be used for updating priority values, so do not match in OPS network. Furthermore, these path-based learning approaches do not consider global load balancing over whole network. Thus, there remains further possibilities for improving efficiency of networks. This paper proposes a new method of route and wavelength assignment suitable for the online operation. By using typical meta heuristics algorithm, genetic algorithm, proposed method can realize global load balancing at practical processing time. We verify the effectiveness of the proposed method through simulation results.

关键词： Algorithm design and analysis Genetic algorithms optical packet switching Wavelength assignment Load management optical losses optical wavelength conversion optical fiber devices Delay lines Learning systems

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Narrow gap nano-dots growth by droplets heteroepitaxial mode

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INFRARED PHYSICS & TECHNOLOGY 2009年第6期52卷 229-234页

作者： Shusterman, S. Raizman, A. Paltiel, Y. Hebrew Univ Jerusalem Dept Appl Phys IL-91904 Jerusalem Israel Hebrew Univ Jerusalem Ctr Nano Sci & Nanotechnol IL-91904 Jerusalem Israel Soreq NRC Electroopt Div IL-81800 Yavne Israel

There is an increasing interest in Quantum Dot (QD) structures for a plethora of applications, including optoelectronic devices, quantum information processing and energy harvesting. Over the last few years, self assembled quantum dots have been observed in a wide variety of semiconductor systems. Several methods for self organized dots have been suggested, among them the most common is the Stranski-Krastanov (S-K) growth mode. The S-K growth mode needs a mismatch between the substrate and the dots material. Recently, an alternative approach of growing QD's, has emerged known as the Droplet heteroepitaxial method. This method is potentially not limited to mismatched material systems and is very attractive for growth of binary and more complicated compounds based on low melting point elements. In this work we present a detailed study on the growth mechanisms of the InSb-based droplets quantum dots and show the large versatility of this droplets growth system in achieving different optical properties of the dots system. (C) 2009 Elsevier B.V. All rights reserved.

关键词： Self assembly Nano-dots Droplets heteroepitaxial iii-V Semiconductors MOVPE growth InSb dots

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Image processing methods for visual prostheses based on DSP

Image processing methods for visual prostheses based on DSP

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7th International conference on Photonics and Imaging in Biology and Medicine

作者： Liu, Huwei Zhao, Ying Tian, Yukun Ren, Qiushi Chai, Xinyu Biomedical Engineering Department School of Life Science and Biotechnology Shanghai Jiao Tong University Shanghai China

Visual prostheses for extreme vision impairment have come closer to reality during these few years. The task of this research has been to design exoteric devices and study image processing algorithms and methods for different complexity images. We have developed a real-time system capable of image capture and processing to obtain most available and important image features for recognition and simulation experiment based on DSP (Digital Signal Processor). Beyond developing hardware system, we introduce algorithms such as resolution reduction, information extraction, dilation & erosion, square (circular) pixelization and Gaussian pixelization. And we classify images with different stages according to different complexity such as simple images, medium complex images, complex images. As a result, this paper will get the needed signal for transmitting to electrode array and images for simulation experiment. © 2009 SPIE.

关键词： Real time systems

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PNIPAM: a thermo-activated nano-material for use in optical devices

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MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOsystems-information STORAGE AND processing systems 2008年第4-5期14卷 691-695页

作者： Mias, Solon Sudor, Jan Camon, Henri CNRS LAAS F-31077 Toulouse 4 France CEA LETI F-38054 Grenoble France

In this paper we describe the use of thermo-activated PNIPAM nano-material in optical switching devices. In other publications, the PNIPAM is used either as a carrier for crystalline colloidal array self-assemblies or as micro-particles that serve as pigment bags. In this publication we use a simpler-to-fabricate pure PNIPAM solution in a semi-dilute regime. The PNIPAM devices produced are transparent at temperatures below a critical temperature of 32 degrees C and become diffusing above this temperature. We show that at 632 nm the transmission through the devices is about 75% in the transparent state while the additional attenuation achieved in the diffusing state is of the order of 38 dB. The experimental fall and rise times obtained are large (about 300 ms and 5 s, respectively) due to the non-optimised thermal addressing scheme. In addition, spectral measurements taken in the infrared spectrum (700-1,000 nm) demonstrate that the cell response is flat over a large portion of the infrared spectrum in both the transparent and the diffusing states.

关键词： optical switching thermal activation PNIPAM

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PNIPAM: a thermo-activated nano-material for use in optical devices

PNIPAM: a thermo-activated nano-material for use in optical ...

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conference on Smart Sensors, Actuators and MEMS iii

作者： Mias, Solon Sudor, Jan Camon, Henri CNRS LAAS F-31077 Toulouse 4 France CEA LETI F-38054 Grenoble France

关键词： optical switching thermal activation PNIPAM

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Comparison of discriminant analysis methods applied to diffractive optically variable image

Comparison of discriminant analysis methods applied to diffr...

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IEEE International Workshop on Anti-counterfeiting, Security, Identification, ASID

作者： Rukun Hu Youji Feng Ping Guo Image Processing and Pattern Recognition Laboratory Beijing Normal University Beijing China The School of Computer Science and Technology Beijing Institute of Technology Beijing China

As a kind of powerful anti-counterfeiting device, diffractive optically variable image (DOVI) has been developed and widely used in information security field. However, the identification of DOVI today by bare eyes is not reliable. In this paper we investigate the recognition of DOVI with machine learning method, and five kinds of algorithms, namely quadratic discriminate analysis (QDA), linear discriminate analysis (LDA), regularized discriminate analysis (RDA), leave-one-out covariance matrix estimate (LOOC), and Kullback-Leibler information measure based method (KLIM) are applied to the recognition of DOVI. Considering both time cost and correct classification rate, KLIM classifier exceeds others.

关键词： Image analysis optical diffraction information analysis Algorithm design and analysis optical devices information security Eyes Learning systems Machine learning algorithms Linear discriminant analysis

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Ultra Wide Band Radar Based Tamper-Resistant Clinical Asset Tracking System (ATS)

Ultra Wide Band Radar Based Tamper-Resistant Clinical Asset ...

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Cairo International Biomedical Engineering conference, CIBEC

作者： A. Khan N. Z. Azeemi A. Hameed I. Ali T. Rasool Bio-Inspired Advance IT Laboratory Center for Advanced Studies in Telecommunication (CAST) COMSATS Institute of Information Technology Islamabad Pakistan Next Generation Networks Center for Advanced Studies in Telecommunication (CAST) COMSATS Institute of Information Technology Islamabad Pakistan Optical Communications Laboratory Center for Advanced Studies in Telecommunication (CAST) COMSATS Institute of Information Technology Islamabad Pakistan

From a patient safety perspective, time-consuming searches for life saving equipments or drugs have been the subject of a hazard report or recall. In addition to yielding significant time saving asset tracking systems (ATS) ensure all assets tracking. In this work, an ultra wide band (UWB) tracking system is developed, that automatically captures the movement of in-house patients and clinical staff. The whole system comprises of position assessment block (PAB), position management block (PMB) and application processing unit (APU), connected through UWB and wireless LAN network. System is tested in a typical hospital ward environment for diversified UWB receiver tracking methodologies, such as point mode tracking (PMT), linear scan mode tracking (LSMT), bat mode tracking (BMT) and panoramic tracking (PMT). Characterization of suitable tracking schemes is also discussed. Robustness of system is verified for across various position detection algorithms e.g., angle of arrival (AOA), received signal strength (RSS) and time of arrival (TOA). In addition to helping staff locate equipment, our ATS is able to facilitate use and distribution of inventory by collecting and facilitating the of data on equipment location over time and hence prone to be tampered.

关键词： Ultra wideband radar Radar tracking Safety devices Drugs Hazards Ultra wideband technology Wireless LAN System testing Hospitals Robustness

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Hierarchy and energy dissipation in optical near-fields and their system applications

Hierarchy and energy dissipation in optical near-fields and ...

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conference on Plasmonics - Nanoimaging, Nanofabrication, and their Application iii

作者： Naruse, Makoto Ohtsu, Motoichi Natl Inst Informat & Commun Technol 4-2-1 Nukui Kita Koganei Tokyo 1848795 Japan Univ Tokyo Sch Engn Dept Elect Engn Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)9780819467904

Recent advances in near-field optics and sub-wavelength-precision fabrication technology allow the design of optical devices and systems at densities beyond those conventionally limited by the diffraction of light. Such higher integration density, however, is only one of the benefits of optical near-fields over conventional optics and electronics. In this paper, we exploit additional notable features in optical near-field interactions, which are physical hierarchy in optical near-fields and the properties associated with energy dissipation processes. We present their theoretical backgrounds and their applications. We deal with security aspects of optical near-field interactions by noticing environmental factors. We also demonstrate hierarchical systems based on dipole-dipole interactions and angular spectrum representation of optical near-fields as well as associating them with energy dissipation processes, which lead to another functionality such as traceability of information.

关键词： nanophotonics optical near-field optical excitation transfer electromagnetism quantum optics signal processing angular spectrum

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