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    Wyświetlanie 1-14 z 14
    Tytuł:
    Survey on Message Filtering Techniques for On-line Social Network
    Autorzy:
    Rajkumar, M. Newlin
    Kayathri, P.
    Dhurka, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191459.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    On-line Social Network
    filtering rule
    text classification
    blacklist
    Opis:
    A social network is a set of people or organizations or other social entities connected by set of social relationships such as friendship, co-working or information exchange. Online Social Networks (OSN) usually not support to the user for message filtering. To solve this issue, which allows OSN users to have a direct control on the messages posted on their walls. The users can control the unwanted messages posted on their own private space .To avoid unwanted messages displayed and they can also block their friend from friends list using filtering rule, content based filtering and short text classification.
    Źródło:
    World Scientific News; 2016, 40; 163-174
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of inverse filtering techniques in the sea bottom recognition
    Autorzy:
    Łubniewski, Z.
    Moszyński, M.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332346.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the newly developed approach to the sea bottom recognition and identification, which uses inverse filtering techniques to extract bottom scattering properties from a single-beam echosounder signal. Using simple physical model, the developed inverting procedure allows to remove the influence of pulse shape, beam pattern and model geometry upon the backscattered echo. 11permits to obtain the seabed impulse response which is directly related to the function describing the angular dependence of bottom reverberation coefficient. Various direct and iterative inverse methods can be applied to the mentioned problem. The results of testing the method using echoes from several bottom types are in agreement with the predictions of theoretical models. Moreover, the proposed bottom classification procedure uses simple parameters of deconvolved function and the obtained classification results are better than those of ofher bottom identification methods of normal incidence.
    Źródło:
    Hydroacoustics; 1999, 2; 95-100
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Filtering techniques to improve efficiency of leak localization in pipelines
    Autorzy:
    Ostapkowicz, Paweł
    Powiązania:
    https://bibliotekanauki.pl/chapters/32304241.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    leaks
    pipelines
    leak detection systems
    gradients
    Opis:
    This work presents very simple and efficient filtering techniques to improve the accuracy of the localization procedure based on gradient increments. The procedure can be successfully used to localize a location of leakage that occurred during steady-state pipeline conditions. It also shows possibilities of using the procedure to localize a leak point related to the occurrence of a leak in transient state. The effectiveness of the filtering techniques has been proven by the results of localization errors in function of time response. They relate to the use of real measured pressure signals obtained for the experiments with simulated small leaks between 0.2–0.8% of nominal flow rate. The experiments were carried out on the pilot pipeline described earlier.
    Źródło:
    Methods and tools in CAD – selected issues; 119-132
    9788366391871
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing Moon Crescent Visibility Using Contrast-Limited Adaptive Histogram Equalization and Bilateral Filtering Techniques
    Autorzy:
    Yussof, Wan Nural Jawahir Hj Wan
    Man, Mustafa
    Umar, Roslan
    Zulkeflee, Ahmad Najmuddin
    Awalludin, Ezmahamrul Afreen
    Ahmad, Nazhatulshima
    Powiązania:
    https://bibliotekanauki.pl/articles/2058508.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    bilateral filtering
    CIELab
    CLAHE
    image enhancement
    moon crescent
    Opis:
    Image enhancement is becoming increasingly im portant with the advancement of space exploration techniques and the technological development of more durable and sci entifically sound observatories equipped with more powerful telescopes. The enhancement of images helps astronomers an alyze the results and act toward determining the dates of religious festivals. This work describes a technique known as contrast-limited adaptive histogram equalization (CLAHE) with grayscale contrast enhancement and bilateral filtering. We apply CLAHE on the L component of the CIE-Lab color space to adjust lightness contrast. Subsequently, grayscale contrast enhancement is performed to increase the visibility of the moon crescent. Noise caused by grayscale contrast en hancement is reduced using bilateral filtering. Two quantitative measures are selected (PSNR and MSE) to show the visual improvement achieved by the proposed algorithm.
    Źródło:
    Journal of Telecommunications and Information Technology; 2022, 1; 3--13
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of modern nonlinear multichannel filtering techniques using recent full-reference image quality assessment methods
    Autorzy:
    Okarma, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/764239.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2008, 8, 2
    1732-1360
    2083-3628
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of modern nonlinear multichannel filtering techniques using recent full-reference image quality assessment methods
    Autorzy:
    Okarma, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/764591.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2008, 8, 1
    1732-1360
    2083-3628
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Conflict Between Free Access to Information and the use of Filtering Techniques in Light of the Yahoo Case
    Autorzy:
    Bodard, Katia
    Powiązania:
    https://bibliotekanauki.pl/articles/654346.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Opis:
    The exponential growth and explosion of Information on the Internet has given rise to several questions of socio-economic, political and legal nature, especially as regard to the issue of free access to information and possible limitations to this free use. Since the Internet is a global operating network exceeding therefore national territories, the problem of universal jurisdiction rises. The introduction of filtering techniques has been introduced to deal with this problem. However the use of filtering techniques poses several problems as well and can clearly have a chilling effect on free speech as well.
    Źródło:
    Acta Universitatis Lodziensis. Folia Oeconomica; 2003, 167
    0208-6018
    2353-7663
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Oeconomica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fine-grained arc-consistency algorithm for non-normalized constraint satisfaction problems
    Autorzy:
    Arangú, M.
    Salido, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/930140.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    problemy z ograniczeniami
    technika filtrowania
    algorytm zgodności
    constraint satisfaction problems
    filtering techniques
    Opis:
    Constraint programming is a powerful software technology for solving numerous real-life problems. Many of these problems can be modeled as Constraint Satisfaction Problems (CSPs) and solved using constraint programming techniques. However, solving a CSP is NP-complete so filtering techniques to reduce the search space are still necessary. Arcconsistency algorithms are widely used to prune the search space. The concept of arc-consistency is bidirectional, i.e., it must be ensured in both directions of the constraint (direct and inverse constraints). Two of the most well-known and frequently used arc-consistency algorithms for filtering CSPs are AC3 and AC4. These algorithms repeatedly carry out revisions and require support checks for identifying and deleting all unsupported values from the domains. Nevertheless, many revisions are ineffective, i.e., they cannot delete any value and consume a lot of checks and time. In this paper, we present AC4-OP, an optimized version of AC4 that manages the binary and non-normalized constraints in only one direction, storing the inverse founded supports for their later evaluation. Thus, it reduces the propagation phase avoiding unnecessary or ineffective checking. The use of AC4-OP reduces the number of constraint checks by 50% while pruning the same search space as AC4. The evaluation section shows the improvement of AC4-OP over AC4, AC6 and AC7 in random and non-normalized instances.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 4; 733-744
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grid Voltages Sensorless Control of the PWM Rectifier with Active Filtering
    Autorzy:
    Wojciechowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/262568.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    active filters
    power quality
    predictive control
    estimation
    techniques
    Opis:
    The paper presents structure and experimental results of the control system of the PWM rectifier with active filtering function. Proposed control system was designed for maximum filtering performance in steady state. This task is realized by predictive algorithms applied for both control as well as calculation of grid currents. Accuracy of these algorithms strongly depends on precise information about future samples of equivalent electromotive force of the grid, which is in general distorted and unbalanced. For this purpose, a novel estimator and predictor is proposed. The control of DC voltage is realized with application of variable gain PI controller. It ensures high dynamics in transient states and low gain for steady state oscillations of DC voltage. Proposed control system is AC voltages sensor less and has excellent active filtering performance, even at presence of grid voltage distortions.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 35-43
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Image Preprocessing for Illumination Invariant Face Verification
    Autorzy:
    Leszczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308517.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    DLDA
    face verification
    histogram normalization
    homomorphic filtering
    illumination normalization
    LDA
    PCA
    preprocessing techniques
    quotient image
    retinex
    Opis:
    Performance of the face verification system depend on many conditions. One of the most problematic is varying illumination condition. In this paper 14 normalization algorithms based on histogram normalization, illumination properties and the human perception theory were compared using 3 verification methods. The results obtained from the experiments showed that the illumination preprocessing methods significantly improves the verification rate and it's a very important step in face verification system.
    Źródło:
    Journal of Telecommunications and Information Technology; 2010, 4; 19-25
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparative Study of Various Edge Detection Techniques for Underwater Images
    Autorzy:
    Awalludin, Ezmahamrul Afreen
    Arsad, Tengku Noorfarahana T.
    Yussof, Wan Nural Jawahir Hj Wan
    Bachok, Zainudin
    Hitam, Muhammad Suzuri
    Powiązania:
    https://bibliotekanauki.pl/articles/2058499.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    edge detection
    mean square error
    median filtering
    peak signal to noise
    wiener filtering
    Opis:
    Nowadays, underwater image identification is a challenging task for many researchers focusing on various ap plications, such as tracking fish species, monitoring coral reef species, and counting marine species. Because underwater im ages frequently suffer from distortion and light attenuation, pre-processing steps are required in order to enhance their quality. In this paper, we used multiple edge detection techniques to determine the edges of the underwater images. The pictures were pre-processed with the use of specific techniques, such as enhancement processing, Wiener filtering, median filtering and thresholding. Coral reef pictures were used as a dataset of underwater images to test the efficiency of each edge detection method used in the experiment. All coral reef image datasets were captured using an underwater GoPro camera. The performance of each edge detection technique was evaluated using mean square error (MSE) and peak signal to noise ratio (PSNR). The lowest MSE value and the highest PSNR value represent the best quality of underwater images. The results of the experiment showed that the Canny edge detection technique outperformed other approaches used in the course of the project.
    Źródło:
    Journal of Telecommunications and Information Technology; 2022, 1; 23--33
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Road profile identification using estimation techniques: comparison between independent component analysis and Kalman filter
    Autorzy:
    Chaabane, Mariem Miladi
    Ben Hassen, Dorra
    Abbes, Mohamed Slim
    Baslamisli, Selahattin Caglar
    Chaari, Fakher
    Haddar, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/281808.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    road excitation
    ICA
    Kalman filtering
    dentification techniques
    vehicle model
    Opis:
    This paper focuses on the identification of a road profile disturbance acting on vehicles. Vehicles are subjected to many kinds of excitation sources such as road profile irregularities, which constitute a major area of interest when designing suspension systems. Indeed, determining the road profile is important for passive suspension design on the one hand and for determining an appropriate control law for active suspensions on the other. Direct measurement techniques of the road profile are expensive, so solutions based on estimation theory are needed. The aim of this paper is to characterize the road excitation using the Independent Component Analysis (ICA). This proposed method can reconstruct original excitation sources by using physically measurable signals of the system under study. Here, the estimation of road disturbances is considered as output sources and identified from dynamic responses of the vehicle. These responses can be measured via sensors or can be numerically computed. In our case, they are numerically simulated using the Newmark method and consider different types of road profiles. The obtained results are validated after using a comparison with the Kalman filtering. The robustness of the ICA is confirmed via parametric study.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 397-409
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model-based techniques for virtual sensing of longitudinal flight parameters
    Autorzy:
    Hardier, G.
    Seren, C.
    Ezerzere, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/330954.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    model based estimation
    fault detection
    virtual sensor
    Kalman filtering
    surrogate modelling
    estymacja modelu
    detekcja uszkodzeń
    sensor wirtualny
    filtracja Kalmana
    Opis:
    Introduction of fly-by-wire and increasing levels of automation significantly improve the safety of civil aircraft, and result in advanced capabilities for detecting, protecting and optimizing A/C guidance and control. However, this higher complexity requires the availability of some key flight parameters to be extended. Hence, the monitoring and consolidation of those signals is a significant issue, usually achieved via many functionally redundant sensors to extend the way those parameters are measured. This solution penalizes the overall system performance in terms of weight, maintenance, and so on. Other alternatives rely on signal processing or model-based techniques that make a global use of all or part of the sensor data available, supplemented by a model-based simulation of the flight mechanics. That processing achieves real-time estimates of the critical parameters and yields dissimilar signals. Filtered and consolidated information is delivered in unfaulty conditions by estimating an extended state vector, including wind components, and can replace failed signals in degraded conditions. Accordingly, this paper describes two model-based approaches allowing the longitudinal flight parameters of a civil A/C to be estimated on-line. Results are displayed to evaluate the performances in different simulated and real flight conditions, including realistic external disturbances and modeling errors.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 23-38
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recursive techniques for fast stereovision with low quality images in mobile robotics
    Rekurencyjne techniki szybkiej stereowizji dla obrazów niskiej jakości w robotyce mobilnej
    Autorzy:
    Klimaszewski, J.
    Putz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/258121.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    stereoskopowe dopasowywanie obszarami
    rekurencja
    segmentacja obiektów
    stereo matching
    area based
    recursion
    box filtering
    object segmentation
    Opis:
    One of the main problems in mobile robotics is obtaining knowledge about the surroundings from sensor data. This article describes attempts of fast 3D observed scene feature extraction based on information from a two-camera stereovision system. The additional assumption is that the robot vision system, dedicated to the navigation purpose, should be able to work with low quality images. The power of recursive techniques in the implementation of real-time working algorithms is presented in regard to standard area-based stereo matching but mainly focused on the new recursive algorithm for characteristic object segmentation in low quality images.
    Artykuł opisuje próby ekstrakcji cech trójwymiarowych obserwowanej sceny na podstawie informacji, pochodzącej z dwukamerowego systemu stereowizyjnego robota mobilnego. Jako dodatkowe założenie przyjęto, że system wizyjny robota, przeznaczony do celów nawigacji, powinien działać bazując nawet na obrazach niskiej jakości, która często jest efektem braku sztywności układu kamer podczas ruchu robota. Tematem wiodącym jest ukazanie siły technik rekurencyjnych, pozwalających na implementację algorytmów pracujących w czasie rzeczywistym. Zaprezentowano zasadę stosowania rekurencji do eliminacji obliczeń Redundantnych w algorytmach stereoskopowego dopasowywania obszarami oraz nowy algorytm rekurencyjny opracowany w celu wychwytywania obiektów charakterrystycznych w obrazach niskiej jakości. Algorytm, po wykonanej filtracji LoG, pozwala na wykrywanie obiektów dużych oraz grup małych obiektów, zależnie od ustawionego progu. Ponadto, zastosowanie algorytmu nie wymaga użycia dodatkowych metod usuwania szumów z obrazu. Opracowana metoda, przeznaczona do przygotowania obrazów stereowizyjnych do dalszej analizy, pozwala zachować w postaci obiektów większą ilość charakterystycznych cech widocznych na obrazie. Wyodrębnione obiekty mają umożliwić dalszą rekonstrukcję sceny 3D.
    Źródło:
    Problemy Eksploatacji; 2008, 4; 91-99
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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