Temat: mammograms - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Adaptive wavelet techniques for compressing digital mammograms
Autorzy:: Bruckmann, A.
Flatscher, H.
Schell, T.
Uhl, A.
Tematy:: wavelet compression
wavelet packet
time-varying decomposition
NSMRA
mammograms; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1954514.pdf Link otwiera się w nowym oknie
Opis:: In this work we investigate the possible benefit of employing adaptive wavelet algorithms instead of the classical fixed pyramidal wavelet decomposition for the compression of digital mammograms. In particular, we target on adaptive wavelet packet and NSMRA decompositions. We observe that information cost function optimized wavelet packet subband structures do not offer compression performance gain in this case whereas NSMRA decompositions moderately improve the results of classical wavelet decompositions. Due to the lack of fast and reliable search algorithms fixed NSMRA decompositions need to be generated and employed for classes of similar images.
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Multiscale modeling of local directional mammogram findings
Autorzy:: Jasionowska, M
Przelaskowski, A.
Tematy:: transformacje wielozakresowe
złożone falki
dyskretne falki
lokalne znalezienie kierunku
mammografia
multiscale transformations
complex wavelets
discrete wavelets
directional local findings
mammograms; Pokaż więcej
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Powiązania:: https://bibliotekanauki.pl/articles/333375.pdf Link otwiera się w nowym oknie
Opis:: In this paper two multiresolution transforms (discrete 2D wavelets and complex wavelets) are compared for their capabilities to enhance local texture orientation of mammograms. The local orientation of image texture is useful feature to detect one of the typical types of abnormal findings in mammography - architectural distortions. Our research was directed to define an effective, more reliable directional model of local directional findings in mammograms. Computer-aided diagnosis was considered as a concept of accurate model application.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of suspicious lesions in digital mammograms
Autorzy:: Choraś, R. S.
Tematy:: sterowane filtry
mammografie
wychwytywanie cech
klasyfikacja
steerable filters
mammograms
moment and texture features
feature extraction
classification; Pokaż więcej
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Powiązania:: https://bibliotekanauki.pl/articles/333369.pdf Link otwiera się w nowym oknie
Opis:: The system using steerable filters for analysis suspicious lesions in mammograms is proposed. This system is based on moments and texture features. The set of well defined and classified suspicious lesions regions from mammograms database are used as a reference pattern. The similarity measure for reference pattern image and patient mammogram is found by computing the distance between their corresponding feature vectors. The Euclidean distance metric is used to finding the nearest class to patient feature vector what in result mark the automatically classify this mammograms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Fuzzy histograms, weak fuzzification and accumulation of periodic quantities. Application in two accumulation-based image processing methods
Autorzy:: Chmielewski, Leszek J
Wydawca:: Springer-Verlag London
Cytata wydawnicza:: Chmielewski L J. Fuzzy histograms, weak fuzzification and accumulation of periodic quantities. Application in two accumulation-based image processing methods. Pattern Analysis and Applications, 9(2-3):189-210, October 2006.
Opis:: Leszek Chmielewski
Więcej informacji: http://www.lchmiel.pl
The influence of the scale of a fuzzy membership function used to fuzzify a histogram is analysand. It is shown that for a class of fuzzifying functions it is possible to indicate the limit for fuzzification, at which the mode of the histogram equals to the mean of the data accumulated in it. The fuzzification functions for which this appears are: the quadratic function for aperiodic histograms and the cosine square function for periodic ones. The scaled and clipped versions of these functions can be used to control the degree of fuzzification belonging to the interval [0;1]. While the quadratic function is related to the widely known Huber-type clipped mean or the kernel function derived from the Epanechnikov kernel, the clipped cosine square seems to be less known. The indications for using strong or weak fuzzification, according to the value of the fuzzification degree, are justified by examples in two applications: classic Hough transform-based image registration and novel accumulation-based line detec tion. Typically, the weak fuzzification is recommended. The images used are related to simulation images from teleradiotherapy and to mammographic images.
Ministerstwo Nauki i Szkolnictwa Wyższego, projekt 3 T11C 050 29, 2005-2008.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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