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Języki publikacji
Abstrakty
The paper describes the influence of variable selection on an image decomposition. A NMR image is a source of a set of variables describing pixels of the image: gray level, gradient magnitude and seven variables derived from gradient magnitudes of neighbouring pixels. A selection of the variables is the essence of the matter at this stage of the image processing. Two suggestions are proposed and tested: a normalization of gradient magnitude of the pixel by dividing it by a value of the gray level, and development of a nonlinear sequence of thresholds which are used in comparison of adjacent pixels.
Rocznik
Tom
Strony
183--187
Opis fizyczny
Bibliogr. 6 poz., rys.
Twórcy
autor
- Institute of Computer Science PAS, Ordona 21, 01-237 Warsaw
Bibliografia
- [1] GRZEGOREK M., Homogeneity of pixel neighborhoods in gray level images investigated by the Grade Correspondence Analysis, in: Kurzyński M., Puchała E., Woźniak M., Żołnierek A., Computer Recognition Systems 2, pp 76-83, Springer, series Advances in Soft Computing, Berlin-Heidelberg, 2007.
- [2] GRZEGOREK M., Towards an exploration of GCA ordered pixels, in: Kurzyński M., Puchała E., Woźniak M., Żołnierek A., Computer Recognition Systems 2, pp 156-163, Springer, series Advances in Soft Computing, Berlin-Heidelberg, 2007.
- [3] http://gradestat.ipipan.waw.pl/
- [4] KOWALCZYK T., PLESZCZYŃSKA E., RULAND F., Grade Models and Methods for Data Analysis, With Applications for the Analysis of Data Populations, Series: Studies in Fuzziness and Soft Computing, Vol. 151, Springer Verlag Berlin Heidelberg New York, 2004.
- [5] KSIĄŻYK J., MATYJA O., PLESZCZYŃSKA E., WIECH M., Analiza danych medycznych i demograficznych przy użyciu programu GradeStat. Instytut Podstaw Informatyki Polskiej Akademii Nauk, Instytut “Pomnik – Centrum Zdrowia Dziecka”, Warszawa, 2005.
- [6] PLESZCZYŃSKA E., Application of grade methods to medical data: new examples, Biocybernetics and Biomedical Engineering, Vol. 27, No. 3, pp. 77-93, 2007.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-PWA4-0006-0026