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    Wyświetlanie 1-11 z 11
    Tytuł:
    Potential Contour Ensembles
    Autorzy:
    Tomczyk, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1373679.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    active contours
    classifier ensembles
    information fusion
    potential contours
    Opis:
    In the paper a contour ensemble image segmentation concept is presented. It bases on the previously observed relationship between contours and classifiers. Because of the specificity of the active contour segmentation the method requires a special procedure to obtain ensemble members with desired properties. In this work it is achieved by early stopping of randomized optimization algorithm. The results of the method are illustrated with a practical problem of heart ventricle segmentation by means of active potential contours. Automatically found contours may be of use in a process of pulmonary embolism diagnosis.
    Źródło:
    Schedae Informaticae; 2015, 24; 113-121
    0860-0295
    2083-8476
    Pojawia się w:
    Schedae Informaticae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detecting sharp contours of images
    Wykrywanie ostrych konturów obrazów
    Autorzy:
    Korzeniewski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/905374.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    wavelets theory
    function cusps
    sharp contours
    Opis:
    The theory of wavelets introduced by Daubechies is a developing branch of mathematics with a wide range of potential applications. This paper presents a survey of some methods of detecting sharp cusps of unknown function developed by Wang with examples of their application to detecting sharp contours of images. A simple original algorithm to detect sharp contours of two dimensional images is also proposed and its application is presented. Visual examination allows to state that the results are comparable with the Wang’s method.
    Teoria falek wprowadzonych przez Daubechies jest rozwijającą się częścią matematyki, stosowaną w wielu dziedzinach. W artykule tym przedstawiony jest przegląd metod wykrywania „szpiców” nieznanej funkcji opracowanych przez Wanga. Metody wykrywania szpiców i skoków w przypadku jednowymiarowym są zilustrowane przykładem zastosowania do funkcji rzeczywistej jednej zmiennej, która ma jeden szpic oraz jeden skok (por. rys. 1). W przypadku dwuwymiarowym metody są zilustrowane przykładem zastosowania do wykrywania ostrych konturów obrazu przedstawiającego fotografię kobiety (por. rys. 2). Część 4 artykułu jest wkładem własnym autora. Zaproponowany jest algorytm rozpoznawania ostrych konturów obrazów, którego zaletą jest prostota oraz szybkość działania. Algorytm jest zastosowany do ustalenia ostrych konturów fotografii przedstawiającej martwą naturę. Wzrokowa ocena efektów algorytmu pozwala na stwierdzenie, że wyniki są porównywalne z wynikami uzyskanymi przez Wanga za pomocą metod opartych na skomplikowanym aparacie matematycznym oraz wolno działających.
    Źródło:
    Acta Universitatis Lodziensis. Folia Oeconomica; 2002, 156
    0208-6018
    2353-7663
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Oeconomica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active contour segmentation of disjoint objects applied to medical images
    Autorzy:
    Pięta, Ł.
    Tomczyk, A.
    Szczepaniak, P. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/333451.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    segmentacja obrazu
    image segmentation
    potential active contours
    Opis:
    Potential contours are methods for automatic image analysis. In the present paper, potential contours adapted in the supervised way are used for segmentation of disjoint objects and examined using medical images.
    Źródło:
    Journal of Medical Informatics & Technologies; 2008, 12; 163-168
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perceptual Impact of Speech Melody Hybridization: English and Czech English
    Autorzy:
    Volín, Jan
    Poesová, Kristýna
    Powiązania:
    https://bibliotekanauki.pl/articles/620758.pdf
    Data publikacji:
    2016-03-01
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    intonation
    F0 contours
    speech melody
    reaction time
    Czech-accented English
    Opis:
    The current paper examines the role of intonation in the perception of foreign-accented speech. In order to assess how difficult it is to mentally process native, non-native and modified speech melodies, four conditions were analyzed and compared: native English, native English with Czech melody, Czech English with native melody and Czech English. The method of reaction times measurement in a word monitoring task was employed, in which 108 Czech listeners heard English sentences in the explored conditions and pressed a button when hearing a target word. Speech melody turned out to have a relatively weak but discernible impact on perceptual processing. Interestingly, Czech English proved to be more difficult to process than native English, although the listeners were Czech. The implementation of English F0 contours on Czech English speech slightly alleviated the cognitive load, however, the second hybrid, native English with Czech melody, pointed to the opposite direction. The causes of this discrepancy were investigated, particularly higher degrees of collocability in certain expressions.
    Źródło:
    Research in Language; 2016, 14, 1; 31-41
    1731-7533
    Pojawia się w:
    Research in Language
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forest before illusory trees: illusory contours of local level elements do not influence perceptual global advantage in the hierarchical structure processing
    Autorzy:
    Styrkowiec, Piotr
    Kras, Dominika
    Powiązania:
    https://bibliotekanauki.pl/articles/430339.pdf
    Data publikacji:
    2015-12-01
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    perceptual organization
    global and local processing
    illusory contours
    locus of perceptual global advantage
    Opis:
    There is a continuing debate in the field of perceptual organization as to whether the locus of global processing is early or late perceptual, as previous studies have yielded contrary results. The conducted behavioural study explored this issue with the paradigm of collating global processing with other process of perceptual organization, namely illusory contours processing. Interaction between these two processes of perceptual organization would indicate that global processing has an early perceptual locus, whereas the lack of such interaction would suggest the late perceptual locus of global processing. In experiment 1, the effect of global dominance was obtained with the use of a compound figure composed of geometrical shapes with real edges. Results showed that the processing of the figure at the global level was faster and that it disrupted the processing of the figures from the local level. In experiment 1b, the compound figure was composed of local geometrical shapes generated with the use of the line-end induced illusory contours (Ehrenstein illusion). Local elements with illusory contours did not affect the processing of the hierarchical structure and the effect of global precedence occurred without any changes. In experiment 2a, a global advantaged effect within a compound figure with local elements with real edges was obtained in the paradigm of attention divided between levels of the hierarchical structure. When illusory contours of local elements of a compound figure were introduced to this paradigm (experiment 2b), this again had no effect on the perceptual global advantage. The results demonstrate the lack of interaction between global processing and illusory contour processing, indicating that the locus of global processing is rather late perceptual.
    Źródło:
    Polish Psychological Bulletin; 2015, 46, 4; 633-646
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine
    Autorzy:
    Rusanov, Andrii
    Subotin, Viktor
    Shvetsov, Viktor
    Rusanov, Roman
    Palkov, Serhii
    Palkov, Ihor
    Chugay, Marina
    Powiązania:
    https://bibliotekanauki.pl/articles/2091359.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    low-pressure cylinder
    flow part
    meridional contours
    spatial flow
    computational investigation
    Opis:
    The results of the gas-dynamic calculation of the low-pressure cylinder flow part of the K-220-44 type steam turbine intended for operation at nuclear power plants are presented. The ways of the flow part improvement were determined. Some of those ways include the use of innovative approaches that were not previously used in steam turbines. The design of the new flow part was carried out on the basis of a comprehensive methodology implemented in the IPMFlow software package. The methodology includes gas-dynamic calculations of various levels of complexity, as well as methods for analytical construction of the spatial shape of the blade tracts based on a limited number of parameterized values. The real thermodynamic properties of water and steam were taken into account in 3D calculations of turbulent flows. At the final step, end-to-end 3D calculations of the lowpressure cylinder that consists of 5 stages were performed. The technology of parallel computing was applied in those calculations. It is shown that due to the application of innovative solutions, a significant increase in efficiency can be achieved in the developed low-pressure cylinder.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 1; 63--87
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the possibility of using archival maps as a source of elevation data
    Autorzy:
    Cichociński, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2191382.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie SILGIS
    Tematy:
    contours
    Military Geographical Institute
    open geodata
    SRTM
    vectorization
    kontury
    Wojskowy Instytut Geograficzny
    geodane otwarte
    wektoryzacja
    Opis:
    One of the most popular sources of elevation data covering the most of the Earth's surface with spatial resolution of up to 30 m (1 angular second to be exact) is the SRTM model. This terrain model has two main disadvantages: it covers the area of the Earth between the parallels 54°S and 60°N only, and in some mountainous and desert areas there are gaps (voids) in the data. Additionally, it may not be suitable for more detailed visualization and analysis due to their limited accuracy. Therefore, the paper attempts to find an alternative source of elevation data. One of them may be archival maps, on which the terrain is presented by means of contours. By vectorization of such lines and adding respective attributes they can serve as a base for building digital terrain models. Examples of such maps are maps created in the period before World War II by Polish Military Geographical Institute (WIG). Although newer topographic maps or even more accurate spatial databases exist, it is assumed that as official materials WIG maps were not covered by copyright, so they are in public domain, just like SRTM. Conducted research and literature studies have shown that the issue of using contours extracted from archival topographic maps is not unambiguous. The lack of reproducibility in the results obtained does not allow making clear recommendations on the feasibility of using archival maps. Using a contour drawing as the sole source of elevation data, without any control, should be considered risky. On the other hand, it seems possible to use them as supplementary and perhaps refining material, but only in places where consistency with other data can be observed.
    Źródło:
    GIS Odyssey Journal; 2021, 1, 1; 177--188
    2720-2682
    Pojawia się w:
    GIS Odyssey Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On representative functions method for clustering of 2D contours with application to pottery fragments typology
    Autorzy:
    Kaliszewska, A.
    Syga, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/205512.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    shape representation
    2D contours
    cross-sections
    rotationally symmetric objects
    representative functions
    clustering
    dynamic time warping (DTW) distance
    Opis:
    We investigate clustering of 2D contours which represent cross-sections of rotationally symmetric objects. We propose modifications of the existing representations of digitized 2D contours and similarity measures. In particular, we represent each of the investigated objects as a single number and two functions and we use the DTW distance to measure their similarity. We apply our method to clustering of pottery fragments.
    Źródło:
    Control and Cybernetics; 2018, 47, 1; 85-108
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hand gesture recognition based on free-form contours and probabilistic inference
    Autorzy:
    Kasprzak, W.
    Wilkowski, A.
    Czapnik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/331308.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    śledzenie dłoni
    analiza sekwencji obrazów
    wnioskowanie stochastyczne
    active contours
    hand pose detection
    hand tracking
    image sequence analysis
    stochastic inference
    Opis:
    A computer vision system is described that captures color image sequences, detects and recognizes static hand poses (i.e., 'letters') and interprets pose sequences in terms of gestures (i.e., 'words'). The hand object is detected with a double-active contour-based method. A tracking of the hand pose in a short sequence allows detecting 'modified poses', like diacritic letters in national alphabets. The static hand pose set corresponds to hand signs of a thumb alphabet. Finally, by tracking hand poses in a longer image sequence, the pose sequence is interpreted in terms of gestures. Dynamic Bayesian models and their inference methods (particle filter and Viterbi search) are applied at this stage, allowing a bi-driven control of the entire system.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 437-448
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Segmentation of breast cancer fine needle biopsy cytological images
    Autorzy:
    Hrebień, M.
    Steć, P.
    Nieczkowski, T.
    Obuchowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/907946.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    segmentacja obrazów
    algorytm działów wodnych
    aktywne kontury
    obraz cytologiczny
    transformata Hough'a
    automat komórkowy
    metoda GrowCut
    cytological image segmentation
    Hough transform
    watershed algorithm
    active contours
    cellular automata GrowCut method
    Opis:
    This paper describes three cytological image segmentation methods. The analysis includes the watershed algorithm, active contouring and a cellular automata GrowCut method. One can also find here a description of image pre-processing, Hough transform based pre-segmentation and an automatic nuclei localization mechanism used in our approach. Preliminary experimental results collected on a benchmark database present the quality of the methods in the analyzed issue. The discussion of common errors and possible future problems summarizes the work and points out regions that need further research.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 2; 159-170
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The four-sided lid driven square cavity using stream function-vorticity formulation
    Autorzy:
    Bagai, Shobha
    Kumar, Manoj
    Patel, Arvind
    Powiązania:
    https://bibliotekanauki.pl/articles/1839818.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    four-sided lid-driven square cavity
    heat and mass transfer
    ADI
    isotherms
    concentration contours
    przepływ
    izotermy
    transfer ciepła
    transfer masy
    liczba Reynoldsa
    liczba Prandtla
    liczba Schmidta
    metoda ADI
    Alternating Direction Implicit
    Opis:
    In this paper, an unsteady 2-D incompressible fluid flow with heat and mass transfer in a four-sided lid driven square cavity is investigated numerically. The top, bottom, left, and right walls of the square cavity move to the right, left, downward and upward respectively. All four sides of the cavity move with a uniform velocity. The flow variables are simulated below the critical Reynolds numbers with isothermal and mass-transfer conditions in the square cavity. We have used a streamfunction-vorticity (ψ - ξ) formulation to investigate the fluid flow in terms of flow variables ψ, ξ, T and C at low Reynolds numbers (Re). The Prandtl number (Pr) and Schmidt number (Sc) have been chosen as 6:62 and 10, 50, 100, 150 respectively, in order to calculate the numerical solutions of T and C. The matrix method has been used to evaluate the stability and convergence of the numerical scheme. The conditions obtained from the matrix method have been used to arrive at the numerical solutions with desired accuracy.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 2; 17-30
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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