Temat: median filter - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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