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检索条件"机构=Computer Graphics and Image Processing Research Laboratory"

共 358 条记录，以下是251-260 订阅

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Comparison radiography and tomography possibilities of FRM-II (20MW) and budapest (10 MW) research reactor

Comparison radiography and tomography possibilities of FRM-I...

引用

8th World Conference on Neutron Radiography, WCNR-8

作者： Balasko, M. Kuba, Ä. Tanács, A. Kiss, Z. Nagy, A. Schillinger, B. MTA KFKI Atomic Energy Research Institute P.O. Box 49 H-1525 Budapest Hungary University of Szeged Dept. of Image Processing and Computer Graphics H-6720 Szeged Hungary FRM-II and Faculty for Physics E21 Technische Universität München Garching Germany

ISBN: (纸本)9781932078749

In November of 2005 a measurement series was conducted on different kinds of reference objects to compare the results of the FRM-II (ANTARES) and the Budapest (Radiography Station) research reactor in the field of neutron radiography, gamma radiography, classical tomography and discrete tomography by an ANDOR CCD camera and Imaging plate with BAS 2500 Scanner (contributed by AIDA software).

关键词： CCD cameras

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Evaluation of RSVP and Mobility-aware RSVP Using Performance Evaluation Process Algebra

Evaluation of RSVP and Mobility-aware RSVP Using Performance...

引用

2008 IEEE International Conference on Communications(ICC 2008)

作者： David I.Laurenson Jane Hillston Institute for Digital Communications Joint Research Institute for Signal & Image Processing School of Engineering & ElectronicsThe University of Edinburgh Laboratory for Foundations of Computer Science School of InformaticsThe University of Edinburgh

As a resource reservation mechanism,the Resource ReSerVation Protocol (RSVP) faces a lot of challenges when applying it to the wireless and mobile *** interworking problems of RSVP and mobility management protocols have been extensively discussed over the last *** the solutions of this problem,mobility-aware RSVP schemes that integrate RSVP and micro-mobility management are becoming more and more ***,the investigation on how much they improve the performance of the basic RSVP is necessary and *** of the traditional simulation based approaches,in this paper we introduce a formal performance evaluation formalism,named Performance Evaluation Process Algebra (PEPA),and employ it to investigate the performance of the basic RSVP and mobility-aware *** performance metrics such as handover blocking probability and signalling cost are presented.

关键词： Protocol net service Evaluation of RSVP and Mobility-aware RSVP Using Performance Evaluation Process Algebra

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An advanced real-time, multi-channel emulated-digital retina model implementation on FPGA

An advanced real-time, multi-channel emulated-digital retina...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Zsolt Voroshazi Zoltan Nagy Peter Szolgay Department of Image Processing and Neurocomputing University of Pannonia Veszprem Hungary Cellular Sensory and Wave Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

Various channels of the neuromorphic, multi-layer retina has been successfully modeled by CNN. Our primary aim was to build up a real-time test environment with camera input and display output in order to mimic the behavior of retina model implementation on emulated digital CNN by using a low-cost, moderate sized field-programmable gate array (FPGA) architecture.

关键词： Retina Field programmable gate arrays Computational modeling Adaptation model Real time systems Biological system modeling Mathematical model

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An SMR based advance resource reservation scheme for combined mobility and QoS Provisioning

An SMR based advance resource reservation scheme for combine...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Hao Wang David I. Laurenson Jane Hillston Institute for Digital Communications Joint Research Institute for Signal & Image Processing School of Engineering & Electronics University of Edinburgh UK Laboratory for Foundations of Computer Science School of Informatics University of Edinburgh UK

One of the major problems of deploying RSVP in the mobile environment is called the advance resource reservation problem. If an RSVP reservation path is reserved in advance in the subnet that a mobile node will visit, the mobile node can continue its QoS session smoothly when it hands over to that subnet. However, if too many network resources are used for advance reservation, new QoS sessions originating from that subnet will experience a higher probability of being blocked needlessly. In this paper, we propose a new advance resource reservation scheme that properly constrains the amount of advance reservations in a subnet and only allows the mobile nodes with large value of session-to-mobility ratio (SMR) to make advance reservation. We evaluate the proposed scheme and the results show that our scheme can effectively reduce both active and passive reservation blocking probabilities and achieves a better utilisation of the network resources, especially when the traffic intensity is high.

关键词： Quality of service Protocols Communication system traffic control Digital communication Signal processing image processing computer science Informatics Mobile computing Telecommunication traffic

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Evaluation of RSVP and Mobility-Aware RSVP Using Performance Evaluation Process Algebra

Evaluation of RSVP and Mobility-Aware RSVP Using Performance...

引用

IEEE International Conference on Communications (ICC)

作者： H. Wang D. I. Laurenson J. Hillston Institute for Digital Communications Joint Research Institute for Signal & Image Processing School of Engineering & Electronics University of Edinburgh UK Laboratory for Foundations of Computer Science School of Informatics University of Edinburgh UK

As a resource reservation mechanism, the Resource ReSerVation Protocol (RSVP) faces a lot of challenges when applying it to the wireless and mobile networks. The interworking problems of RSVP and mobility management protocols have been extensively discussed over the last decade. As the solutions of this problem, mobility-aware RSVP schemes that integrate RSVP and micro-mobility management are becoming more and more popular. Therefore, the investigation on how much they improve the performance of the basic RSVP is necessary and useful. Instead of the traditional simulation based approaches, in this paper we introduce a formal performance evaluation formalism, named Performance Evaluation Process Algebra (PEPA), and employ it to investigate the performance of the basic RSVP and mobility-aware RSVP. Important performance metrics such as handover blocking probability and signalling cost are presented.

关键词： Algebra Protocols Quality of service Measurement Mobile radio mobility management Costs Communications Society Digital communication Signal processing image processing

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An image enhancement technique in the DCT domain for cancer detection

An image enhancement technique in the DCT domain for cancer ...

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Asilomar Conference on Signals, Systems & computers

作者： Xiaoming Liu Qingling Sun Jinshan Tang College of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Image Processing and Bio-imaging Research Laboratory Systems Research Institute Department of Advanced Technologies Alcorn State University Lorman MS USA

In this paper, we develop an image enhancement technology in the DCT domain for radiologists to screen mammograms. The proposed algorithm is an improved version of the algorithm developed. The improved algorithm overcomes the shortcomings of the old algorithm which requires manual adjustment of multiple parameters to realize non-uniform enhancement in different frequency bands. The proposed image enhancement algorithm is expressed as an optimization problem. In the optimization problem, the optimal local enhancement factors are found so that the target global contrast value is achieved which is specified by a user. Because it's a multi-variable optimization problem, genetic algorithm is used to search the optimal parameters. The experimental results show that the algorithm is progressive.

关键词： image enhancement Discrete cosine transforms Cancer detection Breast cancer image coding Mammography image processing Genetic algorithms Wavelet transforms X-ray detection

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An improved WSQ fingerprint image compression algorithm

An improved WSQ fingerprint image compression algorithm

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Asilomar Conference on Signals, Systems & computers

作者： Jinshan Tang Xiaoming Liu College of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Image Processing and Bio-Imaging Reasearch Laboratory Systems Research Institute Department of Advanced Technologies Alcorn State University Lorman MS USA

The wavelet/scalar quantization (WSQ) [1] fingerprint image compression algorithm is effective and has been widely applied to fingerprint image compression. However, WSQ cannot control the compression ratio and its performance on fuzzy images is poor. We propose an improved WSQ fingerprint image compression algorithm to overcome the above shortcomings. Our algorithm uses a mixed quantizer so that the algorithm can treat fuzzy and non-fuzzy fingerprint images separately. In order to control the compression ration, an optimization parameters for a specific compression ratio. The proposed algorithm is compared with the traditional WSQ fingerprint image compression algorithm and the results are encouraging.

关键词： Fingerprint recognition image matching Compression algorithms

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An Anisotropic Diffusion Filtering Implementation to Execute in Parallel Distributed Systems

An Anisotropic Diffusion Filtering Implementation to Execute...

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IEEE International Conference on Computational Science and Engineering Workshops (CSEWORKSHOPS)

作者： Antonio C. Sobieranski Leandro Coser M.A.R. Dantas Aldo v. Wangenheim Eros Comunello LAPIX-Image Processing and Graphic Computing Lab The Cyclops Group Federal University of Santa Catarina Brazil LaPeSD-Distributed Systems Research Laboratory Federal University of Santa Catarina Brazil Graduate Program Applied Computer Science Universidade do Vale do Itajaí Brazil

ISBN: (纸本)9780769532578

In this paper, we present a parallelization of a filtering algorithm related to non-linear anisotropic diffusion, used to enhance the performance of an application in a parallel distributed system. The anisotropic diffusion is a well-established technique for image enhancement by means of diffusivity functions, which act as border attenuators. However, it requires a high computational cost when a large amount of data is used. The proposed implementation was parallelized considering both point-to-point and collective communications, adopting the MPI paradigm. Results from both approaches indicate that the proposed algorithm has reached interesting levels of performance (81% and 93% of efficiency, respectively) when compared to the execution of one process in a single computer node. In addition, our results indicate an enhancement of around 21% utilizing the collective communication strategy when compared to point-to-point communication.

关键词： Filtering Magnetic separation Anisotropic magnetoresistance Ions Kernel Maximum likelihood detection Pixel

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FPGA based emulated-digital CNN-UM implementation with GAPU

FPGA based emulated-digital CNN-UM implementation with GAPU

引用

IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Zsolt Voroshazi Andras Kiss Zoltan Nagy Peter Szolgay Department of Image Processing and Neurocomputing University of Pannonia Veszprem Hungary Faculty of Information Technology Pázmány Péter Catholic University Hungary Cellular Sensory and Wave Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The paper addresses the issue of implementing a GAPU (global analogic programming unit) on the emulated-digital CNN-UM (cellular neural/nonlinear networks universal machine) architecture. It has been embedded with a flexible Xilinx MicroBlaze soft-core processor to take full advantage of the joint computing power of high-speed arithmetics and programmability. The GAPU implementation accelerates the processing performance of the Falcon architecture by decreasing the I/O communication and it also provides a stand-alone operation, which is capable of controlling complex sophisticated analogic CNN algorithms similar to various visual microprocessors, such as the ACE16k and the Q-Eye in the Bi-i, and eye-RIS cellular vision systems. Our primary aim was to implement an FPGA-based emulated-digital CNN-UM with embedded GAPU for computation intensive, real image-processing tasks.

关键词： Field programmable gate arrays computer architecture Process control Random access memory Vector processors Mathematical model Computational modeling

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A standalone FPGA based emulated-digital CNN-UM system

A standalone FPGA based emulated-digital CNN-UM system

引用

IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Zsolt Voroshazi Andras Kiss Zoltan Nagy Peter Szolgay Department of Image Processing and Neurocomputing University of Pannonia Veszprem Hungary Faculty of Information Technology Pázmáany Péter Catholic University Hungary Cellular Sensory and Wave Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The Falcon emulated-digital CNN-UM (cellular neural/nonlinear networks universal machine) architecture has been extended by an embedded GAPU (global analogic programming unit) using the flexible Xilinx MicroBlaze soft-core processor to take full advantage of the joint computing power of high-speed distributed arithmetics and programmability. The implemented GAPU provides a stand-alone operation, which is capable of controlling complex sophisticated CNN analogic algorithms similar to various visual microprocessors, such as the ACE4k, ACE16k, and Bi-i vision systems. The quality of the embedded GAPU implementation is demonstrated by analogic algorithms, mainly in which sequences of template operations are required.

关键词： Field programmable gate arrays computer architecture image processing Mathematical model Organizing computers Cellular neural networks

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