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Wyszukujesz frazę "mathematical morphology" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Measurement of retina vessels by segmentation of images reconstructed from optical coherence tomography data
    Autorzy:
    Marciniak, Tomasz
    Stankiewicz, Agnieszka
    Dąbrowski, Adam
    Stopa, Marcin
    Rakowicz, Piotr
    Marciniak, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/220715.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical coherence tomography
    image processing
    mathematical morphology
    vessel segmentation
    Opis:
    In this paper methods and their examination results for automatic segmentation and parameterization of vessels based on spectral domain optical coherence tomography (SD-OCT) of the retina are presented. We present three strategies for morphologic image processing of a fundus image reconstructed from OCT scans. A specificity of initial image processing for fundus reconstruction is analysed. Then, the parameterization step is performed based on the vessels segmented with the proposed algorithm. The influence of various methods on the vessel segmentation and fully automatic vessel measurement is analysed. Experiments were carried out with a set of 3D OCT scans obtained from 24 eyes (12 healthy volunteers) with the use of an Avanti RTvue OCT device. The results of automatic vessel segmentation were numerically compared with those prepared manually by the medical doctor experts.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 3; 449-461
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Rattle Signal Denoising and Enhancing Method Based on Wavelet Packet Decomposition and Mathematical Morphology Filter for Vehicle
    Autorzy:
    Liang, Linyuan
    Chen, Shuming
    Li, Peiran
    Powiązania:
    https://bibliotekanauki.pl/articles/2141688.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rattle signals
    wavelet packet decomposition
    mathematical morphology filter
    critical frequency band
    information entropy
    Opis:
    Buzz, squeak and rattle (BSR) noise has become apparent in vehicles due to the significant reductions in engine noise and road noise. The BSR often occurs in driving condition with many interference signals. Thus, the automatic BSR detection remains a challenge for vehicle engineers. In this paper, a rattle signal denoising and enhancing method is proposed to extract the rattle components from in-vehicle background noise. The proposed method combines the advantages of wavelet packet decomposition and mathematical morphology filter. The critical frequency band and the information entropy are introduced to improve the wavelet packet threshold denoising method. A rattle component enhancing method based on multi-scale compound morphological filter is proposed, and the kurtosis values are introduced to determine the best parameters of the filter. To examine the feasibility of the proposed algorithm, synthetic brake caliper rattle signals with various SNR ratios are prepared to verify the algorithm. In the validation analysis, the proposed method can well remove the disturbance background noise in the signal and extract the rattle components with well SNR ratios. It is believed that the algorithm discussed in this paper can be further applied to facilitate the detection of the vehicle rattle noise in industry.
    Źródło:
    Archives of Acoustics; 2022, 47, 1; 43-55
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the use of Global Urban Footprint to the Polish settlement vectordatabase development
    Autorzy:
    Brzezińska-Klusek, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/145521.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    morfologia matematyczna
    osada
    rozkład przestrzenny
    settlement
    GUF (Global Urban Footprint)
    generalization
    mathematical morphology
    Opis:
    Urbanization has a far-reaching impact on the environment, economy, politi-cal and social processes. Therefore, understanding the spatial distribution and evolution ofhuman settlements is a key element in planning strategies that ensure the sustainable de-velopment of urban and rural settlements. Accordingly, it is very important to map humansettlements and to monitor the development of cities and villages. Therefore, the problem ofsettlements has found its reflection in the creation of global databases of urban areas. Globalsettlement data have extraordinary value. These data allow us to carry out the quantitativeand qualitative analyses as well as to compare the settlement network at a regional, nationaland global scale. However, the possibility of conducting both spatial and attribute analysesof these data would be even more valuable. The article describes how to prepare raster dataso that they can be implemented into a vector database. It answers the questions whetherit is possible to combine these data with databases available in Poland and what benefits itbrings. It presents the methods of data generalization and the optimization of time and diskspace. As a result of the study, two vector databases with GUF data were developed. Thefirst database resolution is similar to the original (~12 m resolution) database, the seconddatabase contains less detailed (~20 m resolution) data, generalized using mathematicalmorphology. Both databases have been enriched with descriptive data obtained from theNational Geodetic and Cartographic Resource.
    Źródło:
    Geodesy and Cartography; 2019, 68, 2; 245-260
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to detect local tectonic dislocations in coal seams based on roughness analysis
    Autorzy:
    Młynarczuk, Mariusz
    Skiba, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2203347.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    uskok tektoniczny
    zagrożenie górnicze
    chropowatość
    local tectonic fault
    mining hazards
    roughness
    madogram
    geostatistic
    mathematical morphology
    Opis:
    The occurrence of faults in coal seams has an impact on the possibility of methane hazard. There are several methods for identifying tectonic faults, but they cannot be applied directly to solve dynamic hazard problems in coal mine. Thus, searching for appropriate methods, that can detect faults in regional and local scales is needed. In order to meet this need, the paper proposes a new measurement method of estimating changes to the coal structure, based on profilometry measurements (roughness analysis) and application of madogram functions. Based on examining coal samples from near fault zones it was shown that the proposed approach allows us to detect changes of the coal surface that appear as the distance to a tectonic fault gets shorter. The proposed method, due to its simplicity and speed of measurement, implies a potential for practical application in the process of detecting local tectonic dislocations in coal mines.
    Źródło:
    Archives of Mining Sciences; 2022, 67, 4; 743--756
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological sharpening of color images
    Autorzy:
    Skoneczny, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201280.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    color image sharpening
    multilevel toggle
    mathematical morphology
    morfologia matematyczna
    obróbka obrazu
    poprawa obrazu
    przetwarzania obrazu
    obraz kolorowy
    Opis:
    This paper presents a novel approach to morphological contrast sharpening of image using the multilevel toggle operator. The concept presented here is a generalization of toggle based contrast operator for gray-level images. The multilevel toggle operator is used to enhance the contrast of multivalued images. In order to perform necessary morphological operations the modified pairwise ordering (MPO) algorithm is proposed. It gives the total order of color pixels. For comparison four other ordering methods are used. The main advantage of the proposed sharpener is its significant contrast enhancing ability when using MPO. Theoretical considerations as well as practical results are shown. Experimental results show its applicability to low-contrast color images.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 103-113
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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