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检索条件"机构=Neurocomputing and Image Processing Department"

共 67 条记录，以下是11-20 订阅

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Strengthening Passwords by Keystroke Dynamics

Strengthening Passwords by Keystroke Dynamics

引用

IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications

作者： Attila Meszaros Zoltan Banko Laszlo Czuni Department of Image Processing and Neurocomputing University of Pannonia Hungary

This document presents the application of biometrics to strength conventional passwords. We show methods to analyze and compare users' keystroke patterns to be able to verify their identity when entering the password into a computer system. The problem's difficulty arises from the fact that only a very limited amount data is available and that new users can come and others may leave the system meantime. That is we are not allowed to re-evaluate all users' data during the application. We show test results based on 2400 records collected from 25 users of different typing ability.

关键词： Biometrics Authentication Fingerprint recognition Application software Humans Filtering Pattern matching Open systems Conferences Data acquisition

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Emulated digital CNN-UM implementation of a barotropic ocean model

Emulated digital CNN-UM implementation of a barotropic ocean...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： Z. Nagy P. Szolgay Department of Image Processing and Neurocomputing University of Veszprem Veszprem Hungary

The solution of partial differential equations (PDE) has long been one of the most important fields of mathematics, due to the frequent occurrence of spatio-temporal dynamics in many branches of physics, engineering and other sciences. One of the most exciting area is the simulation of compressible and incompressible fluids which appears in many important applications in aerodynamics, meteorology and oceanography. On the other hand the solution of these equations requires enormous computing power. In this paper a CNN-UM simulation of ocean currents is presented. Unfortunately the non-linearity of the governing equations does not make possible to utilize the huge computing power of the analog CNN-UM chips. To improve the performance of our solution an emulated digital CNN-UM is used where the cell model of the architecture is modified to handle the non-linearity of the model.

关键词： Oceans Aerodynamics Computational modeling Nonlinear equations Partial differential equations Mathematics Fluid dynamics Physics Power engineering and energy Meteorology

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Inverse elastic wave propagation modeling on CNN-UM architecture

Inverse elastic wave propagation modeling on CNN-UM architec...

引用

European Conference on Circuit Theory and Design, ECCTD

作者： P. Sonkoly S. Kocsardi P. Kozma P. Szolgay Department of Image Processing and Neurocomputing University of Veszprém Hungary

Exploration seismology deals with the use of artificially generated elastic waves to locate mineral deposits (including hydrocarbons, ores, water, geothermal reservoirs, etc.) archeological sites and to obtain geological information for engineering. The elastic waves generated by an explosion propagate through the examined geological area and recorded on the surface. The structure of the area can be determined by using the recorded data called seismogram. The propagation of elastic waves in an elastic medium can be described by second order partial differential equations. The solution of these kinds of equations requires enormous computation power. In this paper a solution of inverse seismic wave propagation is presented on Falcon emulated digital CNN-UM architecture.

关键词： Geothermal power generation Geology Seismology Minerals Ores Water resources Hydrocarbon reservoirs Explosions Surface waves Partial differential equations

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Reducing the Foreground Aperture Problem in Mixture of Gaussians Based Motion Detection

Reducing the Foreground Aperture Problem in Mixture of Gauss...

引用

International Conference on Systems, Signals and image processing, IWSSIP

作者： A. Utasi L. Czuni Department of Image Processing and Neurocomputing University of Pannonia Veszprem Hungary

Separating the moving image parts from the static background is an important phase in video surveillance applications. The method based on mixture of Gaussians (MOG) is an often used and robust approach to learn the background automatically and adaptively. Known MOG methods often suffer from the phenomena called the foreground aperture problem, when parts of large moving homogenous regions become part of the background instead of being selected as moving pixels. This article introduces a new method to eliminate this problem.

关键词： Apertures Gaussian processes Motion detection Gaussian distribution Pixel image processing Video surveillance Robustness Application software Process design

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Colour memory

Colour memory

引用

作者： Bodrogi, Peter Department of Image Processing and Neurocomputing Faculty of Information Technology Pannon University 10 Egyetem St. H-8200 Veszprém Hungary

ISBN: (纸本)0892082623

The aim of this study is to give an overview about the phenomenon of human colour memory: the related concepts, methodology, experimental findings and their interpretation. The concept of "cognitive colour" is defined. The characteristics of short-term and long-term colour memory are discussed, including memory colour shifts. Psycho-physical experimental methods to quantify colour memory are described and some typical memory colour results are briefly presented and interpreted.

关键词： Color

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Configurable multi-layer CNN-UM emulator on FPGA using distributed arithmetic

Configurable multi-layer CNN-UM emulator on FPGA using distr...

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Z. Nagy P. Szolgay Department of Image Processing and Neurocomputing University of Veszprém Veszprem Hungary

A new emulated digital multi-layer CNN-UM (cellular neural network universal machine) chip architecture called Falcon has been developed. Simulation runtimes can be a hundred times shorter using the Falcon processor array compared to the software simulation. This huge computing power makes real time image processing possible. In this paper, the main steps of the FPGA implementation and optimization are introduced. A distributed arithmetic technique is used to optimize the architecture on FPGAs. Using this technique, smaller and faster arithmetic units can be designed than the conventional approach where multiplier cores and adder trees are used to compute the state equation of the CNN array.

关键词： Field programmable gate arrays Arithmetic Cellular neural networks Equations Finite impulse response filter Computer architecture image processing Computational modeling Runtime Analog computers

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Colour space transformation and exact colour reproduction with CNN technology

Colour space transformation and exact colour reproduction wi...

引用

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

作者： P. Kozma B. Kranicz P. Szolgay Department of Image Processing and Neurocomputing University of Veszprém Veszprem Hungary

Nowadays many problems requiring huge computing power have risen. Although the performance of digital processors doubles every year, there are certain tasks where the computation cannot be carried out within a reasonable time interval. Such hard problems are the analysis of big dynamical systems or real-time exact colour reproduction. The exact colour visualization of motion pictures is necessary in industrial, medical and scientific research areas. Thus, for example, exact colour reproduction is required for remote medical diagnosis or remote operation. The doctor has to see the same image that appears in reality. Device dependent colour appearance may cause faulty decisions. Nowadays these problems cannot be solved perfectly because many steps of the transformation are not completely known and the huge number of computations cannot be done in real-time even by the fastest PC. In this article we describe some methods to produce exact colours in a remote medical diagnostic system.

关键词： Space technology Cellular neural networks image processing Medical diagnosis Computer architecture Magnetic resonance imaging Real time systems Application software Analog computers Hardware

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Measuring the motion similarity in video indexing

Measuring the motion similarity in video indexing

引用

IEEE Region 8 International Symposium on Video/image processing and Multimedia Communications (EURASIP)

作者： A. Hanis T. Sziranyi Department of Image Processing and Neurocomputing University of Veszprém Veszprem Hungary

Recent growth in the number of digital videos available motivates the development of video databases for the efficient management of these videos. Common video databases use image information calculated from key frames such as color, texture, shape to index videos, and only few of them are capable to store and retrieve motion information. In this paper we present a method for automatic motion based video indexing and retrieval. A prototype system has been developed, which automatically splits a video into shorter unit called shots, extract representative frames from each shot and estimates motion information in the neighborhood of the r-frame with the phase correlation method. A query can be an extracted motion information of a short sample image sequence, or a quantitatively given motion intensity in five region of the frame.

关键词： Motion measurement Indexing image databases Data mining Shape Indexes Information retrieval image retrieval Prototypes Motion estimation

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An emulated digital retina model implementation on FPGA

An emulated digital retina model implementation on FPGA

引用

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

作者： Z. Nagy Z. Voroshazi P. Szolgay Department of Image Processing and Neurocomputing University of Veszprém Veszprem Hungary

The purpose of the low-level image processing that takes place in the retina is to compress the relevant visual information to a manageable size. The behavior of the external layers of the biological retina has been successfully modelled by a cellular neural network. In the present paper a specialized emulated digital CNN-UM architecture will be introduced which can be very efficiently used in the retina model calculations. The high performance of the proposed architecture makes it possible to emulate one channel of the model in real-time.

关键词： Retina Field programmable gate arrays Neurons Cellular neural networks Differential equations Delay image processing Biological system modeling Very large scale integration Partial differential equations

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Colour space transformation, colour correction and exact colour reproduction with CNN technology

Colour space transformation, colour correction and exact col...

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： N. Kozma B. Kranicz P. Szolgay Department of Image Processing and Neurocomputing University of Veszprém Veszprém Hungary

Nowadays many problems requiring huge computing power have arisen. Although the performance of digital processors doubles every year, there are certain tasks where the computation cannot be carried out within a reasonable time interval. Such hard problems are the analysis of big dynamical systems or real-time exact colour reproduction. The exact colour visualization of motion pictures is necessary in industrial, medical and scientific research areas. Thus, for example, exact colour reproduction is required for remote medical diagnosis or remote operation. The doctor has to see the same image that appears in reality. Device dependent colour appearance may cause faulty decisions. Nowadays these problems cannot be solved perfectly because many steps of the transformation are not completely known and the huge number of computations cannot be done in real-time even by the fastest PC. In this article we describe some methods to produce exact colours in a remote medical diagnostic system.

关键词： Color Space technology Cellular neural networks Medical diagnosis Magnetic resonance imaging image processing Real time systems Motion pictures Biomedical imaging Medical diagnostic imaging

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