ANÁLISE COMPARATIVA DE TÉCNICAS DE FILTRAGEM ESPACIAL EM ÁREA RURAL NA REGIÃO DO MÉDIO ALTO URUGUAI – RS

Eliara Marin Piazza, Lílian Gonçalvez Mariano, Rafaela Badinelli Hummel, Roselene Marostega Felker, Franciele Coghetto, Maureen de Moraes Stefanello

Abstract


The image filtering is a technique used to improve the quality of digital images through the incorporation of algorithms , which allow to eliminate unwanted regions, derived from procurement methods or inadequate capture that eventually introduce some kind of noise in images. Thus, the objective is to comparatively evaluate different existing filters in order to add to the knowledge about the process of spatial filtering, since studies of this nature are still scarce in the literature. Image were used regarding the rural municipality of Frederico Westphalen, Landsat-5/TM Imager bands 3 (0.63 to 0.69 µm), 4 (0.76 to 0.90 µm) and 5 (1,55 to 1.75 µm) of the year 1985, previously georeferenced which formed the basis for the registration of the images . It was observed that filtering processes used to demonstrate the efficiency of the filter varies with the target , changing the contrast, brightness and structure are important in the understanding of deterioration caused the original image.

Keywords


Frederico Westphalen; spatial image; Landsat-5/TM

References


GONZALEZ, R. C., WOODS, R. E. Digital image processing. New York: Addison-Wesley Publishing Company, 1993.

MÜLLER, D. N.; DARONCO, E. L. Filtros espaciais passa-baixa. Disponível em: . Acesso em: 27 jul 2012.

OLIVEIRA, M.L.N.; FORESTI, C.; NIERO, M.; PARREIRAS, E.M.M.F. Estudo da evolução urbana de Brasília através do uso de dados LANDSAT. São José dos Campos: INPE, 1984. 26 p.

SANT`ANNA, S. J. S. Avaliação de filtros redutores de Speckle. INPE: São José dos Campos. 1993.

SOLBO, S.; ELSOFT, T. A stationary wavelet-domain wiener filter for correlated speckle. IEEE Transactions on Geoscience and




DOI: http://dx.doi.org/10.5902/2236117011019



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Digital Object Identifier (DOI): 10.5902/22361170

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