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Wyszukujesz frazę "Lukač, R." wg kryterium: Autor


Wyświetlanie 1-9 z 9
Tytuł:
Adaptive impulse detection based approaches for the noise reduction in heart image sequences
Autorzy:
Smolka, B.
Lukac, R.
Powiązania:
https://bibliotekanauki.pl/articles/332867.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
sekwencja serca
zakłócenia impulsowe
nieliniowa filtracja
mediana filtra
heart sequence
impulse noise
non-linear filtering
median filter
Opis:
This paper focuses on three-dimensional (3-D) adaptive median filters based on the impulse detection approach designed to effectively remove the impulse noise from cardiographic image sequences. Impulse noise affects the useful information in the form of bit errors and it introduces to the image high frequency changes that prohibit to process and to evaluate the heart dynamics correctly. Therefore biomedical imaging such as vascular imaging and quantification of heart dynamics is closely related to digital filtering. In order to suppress impulse noise effectively, well-known non-linear filters based on the robust order-statistic theory provide interesting results. Although median filters have excellent impulse noise attenuation characteristics, their performance is often accompanied by undesired processing of noise-free samples resulting in edge blurring. The reason is that median filters do not satisfy the superposition property and thus the optimal filtering situation where only noisy samples are affected can never be fully obtained. The presented adaptive impulse detection based median filters, can achieve the excellent balance between the noise suppression and the signal-detail preservation. In this paper, the performance of the proposed approaches is successfully tested for the heart image sequence of 38 frames and the wide range of noise corruption intensity. The results are evaluated in terms of mean absolute error, mean square error and cross correlation.
Źródło:
Journal of Medical Informatics & Technologies; 2002, 3; MI21-29
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Adaptive Center-Weighted Vector Median Framework for the Enhancement of cdna Microarray Images
Autorzy:
Lukac, R.
Smołka, B.
Powiązania:
https://bibliotekanauki.pl/articles/908149.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
informatyka
DNA microarray images
multichannel image processing
order-statistic theory
vector filters
impulsive noise
Opis:
In this paper a novel method of noise reduction in color images is presented. The new technique is capable of attenuating both impulsive and Gaussian noise, while preserving and even enhancing the sharpness of the image edges. Extensive simulations reveal that the new method outperforms significantly the standard techniques widely used in multivariate signal processing. In this work we apply the new noise reduction method for the enhancement of the images of the so called gene chips. We demonstrate that the new technique is capable of reducing the impulsive noise present in microarray images and that it facilitates efficient spot location and the estimation of the gene expression levels due to the smoothing effect and preservation of the spot edges. This paper contains a comparison of the new technique of impulsive noise reduction with the standard procedures used for the processing of vector valued images, as well as examples of the efficiency of the new algorithm when applied to typical microarray images.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 3; 369-383
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonparametric design of impulsive noise removal in colour images
Autorzy:
Smolka, B.
Budzan, S.
Lukač, R.
Powiązania:
https://bibliotekanauki.pl/articles/333676.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
wzmocnienie obrazu kolorowego
impulsywne usuwanie szumów
odtworzenie obrazu
colour image enhancement
impulsive noise removal
image restoration
Opis:
In this paper the problem of nonparametric impulsive noise removal in multichannel images is addressed. The proposed filter class is based on the nonparametric estimation of the density probability function in a sliding filter window. The obtained results show good noise removal capabilities and excellent structure preserving properties of the new impulsive noise removal technique.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 7; MIP3-12
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Switching median filter with a local entropy control
Autorzy:
Lukac, R.
Smolka, B.
Bieda, R.
Budzan, S.
Powiązania:
https://bibliotekanauki.pl/articles/333245.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
zakłócenia impulsowe
nieliniowa filtracja
impulsive noise
nonlinear filtering
switching median filter
Opis:
This paper presents a new switching median filter utilising local contrast entropy of the samples inside the filtering window. The proposed method is fully adaptive, it requires no optimisation and eliminates the main disadvantages of the local contrast probability based switching median. Excellent performance of the proposed method is a result of the successful analysis of input samples, as the local contrast entropy concept is able to efficiently differentiate between outliers and desired edge samples.
Źródło:
Journal of Medical Informatics & Technologies; 2003, 5; MI39-46
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Colour video filtering based on vector order-statistics
Autorzy:
Lukac, R.
Smolka, B.
Bieda, R.
Budzan, S.
Powiązania:
https://bibliotekanauki.pl/articles/333243.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
kolorowe filtrowanie wideo
hałas impulsowy
statystyka uporządkowana
filtrowanie wektorowe
colour video filtering
impulsive noise
order statistics
vector filtering
Opis:
The paper introduces a multichannel filtering approach for colour video denoising taking advantage of an order-statistic theory for vector-valued image signals. The proposed adaptive vector filter utilizes switching between an identity operation and a directional distance smoothing function based on the trimmed set of lowest ranked multichannel samples. Because the proposed method uses the same ordering scheme as the standard vector filters, the computational complexity of the new method is computationally attractive. Moreover, the method outperforms the standard vector filters especially in terms of signal-detail preservation. In this paper, we analyse a three-dimensional filter structure based on a cube filter window spawning 27 samples of three following frames. Thus, the proposed algorithm can be applied for the filtering of spatio-temporal or time-varying vector-valued image signals such as colour image sequences or colour video.
Źródło:
Journal of Medical Informatics & Technologies; 2003, 5; MI31-38
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basal to Non-Basal Transition for In-Plane Deformation of AZ31 Magnesium Alloys
Autorzy:
Balík, J.
Lukáč, P.
Kužel, R.
Powiązania:
https://bibliotekanauki.pl/articles/1418426.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.F-
81.40.Ef
Opis:
The increases in strain hardening observed for the in-plane tensile deformation of well-aged magnesium alloy AZ31 are related to a transition from basal to non-basal slip. Based on the results of texture measurements, the double prismatic slip is proposed as the dominant secondary mechanism. The necessary fast strengthening of the basal slip is modelled by an accommodation contribution to the grain boundary resistance. The transition may be consistently modelled by involving the accommodation rather than the production of new sessile dislocations into the evolution laws for dislocation populations.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 435-438
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Roller Bearing
Autorzy:
Kohár, R.
Brumerčík, F.
Lukáč, M.
Nieoczym, A.
Powiązania:
https://bibliotekanauki.pl/articles/117746.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
tapered roller bearings
dynamic simulation
axial load force
Opis:
The aim of this paper is to detail the creation of a large tapered roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
Źródło:
Applied Computer Science; 2016, 12, 1; 5-16
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of roller bearing cages
Autorzy:
Kohar, R.
Krzysiak, Z.
Lukac, M.
Brumercik, F.
Powiązania:
https://bibliotekanauki.pl/articles/132167.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
computer simulation
dynamic analysis
mathematical models
roller bearings
Opis:
The aim of this paper is to detail the creation of a roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
Źródło:
Advanced Technologies in Mechanics; 2016, 3, no. 2 (7); 2-11
2392-0327
Pojawia się w:
Advanced Technologies in Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semen metal profile, spermatozoa morphology and semen biochemical parameters in subfertile men with different lifestyle habits
Autorzy:
Blaszczyk, M.
Toporcerova, S.
Popelkova, M.
Binkowski, L.J.
Semla, M.
Tvrda, E.
Lukac, N.
Massanyi, P.
Stawarz, R.
Powiązania:
https://bibliotekanauki.pl/articles/15805.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Źródło:
Journal of Elementology; 2019, 24, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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