Imagens Speckled
Mostrando 1-3 de 3 artigos, teses e dissertações.
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1. Non-parametric edge detection in speckled imagery
This thesis proposes a non-parametric technique for boundary detection in speckled imagery. Synthetic Aperture Radar (SAR), sonar, B-ultrasound and laser imagery is corrupted by a signal-dependent non-additive noise called speckle. Several statistical models have been proposed to describe such a noise, thus of specialized techniques for image improvement and
Publicado em: 2008
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2. Contrast measures and stochastic distances in a model for speckled data
As imagens de radar de abertura sintÃtica (Synthetic Aperture Radar - SAR) sÃo de grande significancia em processamento de imagens. A principal difiuldade em se trabalhar com imagem SAR Ã a presenca do rudo speckle. Por causa do ruÃdo speckle, propor testes paramÃtricos para avaliar rugosidade no contexto de imagem SAR Ã muito problematico. Neste conte
Publicado em: 2008
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3. Modeling synthetic aperture radar image data
In this thesis we study maximum likelihood estimation (MLE) of the roughness parameter of the G 0 A distribution for speckled imagery (Frery et al., 1997). We discover that when a certain criteria is satisfied by the sample moments, the likelihood function is monotone and MLE estimates are infinite, implying an extremely homogeneous region. We implement four
Publicado em: 2008