Agiou Ioannou Theologou 17 23

Zografou, Greece

Agiou Ioannou Theologou 17 23

Zografou, Greece
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Florin T.,UT Cluj Napoca | Arsinte R.,UT Cluj Napoca | Mastorakis N.E.,Agiou Ioannou Theologou 17 23
Proceedings of the European Computing Conference, ECC '11 | Year: 2011

The aim of this paper is to make the resolution analysis of an image that propagates trough the image acquisition system of a digital camera pipeline. The analysis covers the lens resolution, the pixel dimension, the light exposure, the colors processing blocks and the JPG compression. The input image passes trough a photographic objective; we focus the light on a Bayer color filter array then we interpolate, we sharp and we set the integration time. The color processing analysis covers: the colors balancing, the colors correction, the gamma correction, the conversion to XYZ and the JPG compression.


Kumar S.,Agiou Ioannou Theologou 17 23 | Kumar S.,M M University | Mastorakis N.E.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Technical University of Sofia | Mastorakis N.E.,National Technical University of Athens
WSEAS Transactions on Computers | Year: 2010

Multi-agent based semantic web service composition involves the composition of semantic web services considering each of the agent capability to serve a particular service request. This paper presents the two variations of semantic web service composition process based on the timing of negotiation in composition process. The variations are based on the concept that the negotiation between the service requester and the service providers has been performed before the selection of final service provider or after the final service provider has been selected. Further, based upon one of the model, a novel multi-agent based semantic web service composition approach has been presented.


Malayeri A.D.,Islamic Azad University | Mastorakis N.E.,Agiou Ioannou Theologou 17 23
Recent Researches in Computers and Computing - International Conference on Computers and Computing, ICCC'11 | Year: 2011

speech analyzing in special periods of time has been presented in this paper. One of the most important periods in signal processing is near to Zero. By this paper, we analyze noise speech signals when these signals are near to Zero. Our strategy is defining some subfunctions and compress histograms when a noise speech signal is in a special period. It can be so useful for wavelet signal processing and spoken systems analyzing.


Florin T.,INCDTIM Cluj Napoca | Mastorakis N.E.,Agiou Ioannou Theologou 17 23
WSEAS Transactions on Circuits and Systems | Year: 2010

The goal of this paper is to study how different TV technologies work, and to compare them. We analyze three different situations: a CRT monitor, a LCD monitor and a LEDs monitor. Using the different monitors' spectral power distributions, we propose a six steps spectral image processing algorithm which converts the spectral image in to XYZ standard and then in to the RGB standard. Finally we colour balance the RGB image in order to eliminate the monitors unwanted render colours hues. On the monitors displays we expect to see the same colours text image. Also we present the monitor's colours properties like: colours saturation, brightness, contrast and sharp.


Florin T.,INCDTIM Cluj Napoca | Mastorakis N.E.,Agiou Ioannou Theologou 17 23
WSEAS Transactions on Circuits and Systems | Year: 2010

The goal of this paper is to generate a laser pulse and to capture it by an image acquisition system. We use a confocal resonator to generate a laser pulse; then the generate light is focused in to an optical fiber using a lens; the light propagates through the fiber and at the fiber output light is projected on a CMOS sensor. We compute the PSF (point spread function) and MTF (modulation transfer function) in order to characterize the functionality of the lens and the optical part of a CMOS sensor. We analyze the CMOS electrical part considering the photon shot noise and the FPN (fixed pattern noise). Finally, we use a Lapacian filter, an amplitude filter and a bilateral filter in order to reconstruct the noisy blurred image. We consider the image capture system to be linear shift invariant, axial and the light is orthogonal to the system.


Dubey M.,Maulana Azad National Institute of Technology | Mastorakis N.E.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Hellenic Naval Academy
WSEAS Transactions on Systems and Control | Year: 2010

This paper presents an approach for the design of fuzzy logic power system stabilizers using genetic algorithms. In the proposed fuzzy expert system, speed deviation and its derivative have been selected as fuzzy inputs. In this approach the parameters of the fuzzy logic controllers have been tuned using genetic algorithm. Incorporation of GA in the design of fuzzy logic power system stabilizer will add an intelligent dimension to the stabilizer and significantly reduces computational time in the design process. It is shown in this paper that the system dynamic performance can be improved significantly by incorporating a geneticbased searching mechanism. To demonstrate the robustness of the genetic based fuzzy logic power system stabilizer (GFLPSS), simulation studies on multimachine system subjected to small perturbation and threephase fault have been carried out. Simulation results show the superiority and robustness of GA based power system stabilizer as compare to conventionally tuned controller to enhance system dynamic performance over a wide range of operating conditions.


Mastorakis N.E.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Technical University of Sofia | Mastorakis N.E.,Hellenic Naval Academy
WSEAS Transactions on Systems | Year: 2011

An elegant method for designing 2-D (Two-Dimensional) Comb Filters is provided. The method is based on an appropriate variable transformation. Practical examples illustrate the validity and the efficiency of the method are also included in this brief.


Mastorakis N.E.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Technical University of Sofia | Mastorakis N.E.,Hellenic Naval Academy
WSEAS Transactions on Circuits and Systems | Year: 2011

In this paper, general transformations for designing 2-D (Two-Dimensional) IIR filters are provided. The present approach can be viewed as an extension of the classical method of magnitude approximation and can be applied in several cases of 2-D filter design. Numerical examples illustrate the validity and the efficiency of the method.


Mastorakis N.E.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Technical University of Sofia | Mastorakis N.E.,Hellenic Naval Academy
WSEAS Transactions on Circuits and Systems | Year: 2011

In this paper, new general transformations for designing 2-D (Two-Dimensional) FIR and IIR filters are provided. The present methodology can be viewed as an extension of the McClellan Transformations and can be applied in several cases of 2-D FIR and IIR filter design. Numerical examples illustrate the validity and the efficiency of the method.


Zhuang X.D.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Agiou Ioannou Theologou 17 23 | Mastorakis N.E.,Hellenic Naval Academy
WSEAS Transactions on Computers | Year: 2011

In this paper, the spatial property of the magneto-static field generated by the stable current is discussed and exploited in image analysis. The region-division feature of the magnetic field generated by a current element on 2D plane is investigated experimentally for some simple test images. The virtual edge current in gray-scale images is presented by a magneto-static analogy, which is composed of the tangent edge vectors as a discrete form of the physical current element. The virtual magnetic field generated by the edge current in digital images is investigated experimentally, which is applied in region border detection and region division. A novel image segmentation method is proposed based on the virtual magnetic field generated by the edge current. The experimental results prove the effectiveness of the proposed method, and also indicate the promising application of the physics-inspired methods in image processing tasks.

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