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Time filter

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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. Source


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. Source


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. Source


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. Source


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. Source

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