Spatial Filter
Mostrando 13-24 de 54 artigos, teses e dissertações.
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13. Unsupervised methods of classifying remotely sensed imges using Kohonen self-organizing maps / Metodos de classificação não-supervisionada de imagens de sensoriamento remoto usando mapas auto-organizaveis de Kohonen
This thesis proposes new methods of unsupervised classification for remotely sensed images which particularly exploit the characteristics and properties of the Kohonen Self-Organizing Map (SOM). The key point is to execute the clustering process through a set of prototypes of SOM instead of analyzing directly the original patterns of the image. This strategy
Publicado em: 2009
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14. Estudo da variabilidade sazonal da profundidade óptica do aerossol em São Paulo a partir de radiômetros MFRSR / Study of the seasonal variability of the aerosol optical depth in São Paulo using MFRSR radiometers.
The evaluation of the aerosol effects to the local and global radiation budget, as well as the impact on human health, particularly in large urban centers, demands knowing accurately their concentration and spatial-temporal distribution. In this context, the accurate long term monitoring from ground based stations installed around the world has become a chal
Publicado em: 2008
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15. Aproximação de nuvens de pontos de dados por meio de superfícies de Bézier
The computational and empirical modelling of geophysical phenomena, such as F region zonal plasma drifts, is a basic tool for the understanding and forecasting of effects that have great social-economic impact on the human activities. This work proposes, develops and implements a model, based on Computer Aided Geometric Design techniques, to F region zonal p
Publicado em: 2007
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16. AproximaÃÃo de nuvens de pontos de dados por meio de superfÃcies de BÃzier
The computational and empirical modelling of geophysical phenomena, such as F region zonal plasma drifts, is a basic tool for the understanding and forecasting of effects that have great social-economic impact on the human activities. This work proposes, develops and implements a model, based on Computer Aided Geometric Design techniques, to F region zonal p
Publicado em: 2007
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17. Supramolecular organization, spatial orientation and optical properties of extracellular proteins in corneas and aortas from diabetic spontaneous mice / Organização supramolecular, orientação espacial e propriedades opticas de proteinas extracelulares em conrneas e aortas de camundongos espontaneamente diabeticos
Diabetes mellitus is a chronic disorder of the carbohydrate, lipids and protein metabolism. A characteristic feature of this disorder is the hyperglycemia due to a deficient insulin production or to metabolic defects on its response in peripheral tissues. Hyperglycemia induces non-enzymatic glycosylation of proteins, which is responsible for advanced glycosy
Publicado em: 2007
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18. State-space approach in the relationship among soil physical attributes and wheat yield / Abordagem de espaÃo de estados no relacionamento entre atributos fÃsicos do solo e produtividade do trigo
Este trabalho foi realizado com o objetivo de estudar o relacionamento entre os atributos fÃsicos do solo e a influÃncia destes na produtividade de trigo. Para isso, utilizou-se o mÃtodo de estimaÃÃo chamado de Modelo de EspaÃo de Estados ou modelo de regressÃo linear dinÃmico, comparando-o aos modelos de regressÃo simples e mÃltipla da estatÃstic
Publicado em: 2007
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19. Filtração de gases: estudo da deposição de diferentes tortas de filtração em diferentes meios filtrantes.
The particle retention inside a filter medium, after cleaning, significantly improves the initial pressure drop during the subsequent cycle, that is, the residual pressure drop. However, the way as these particles accommodate inside the filter isnt still very clear, as well as, its impact on filtering performance. This work aims to verify the spatial disposa
Publicado em: 2006
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20. Estimação da resolução espacial da câmera CCD dos satélites CBERS 1 e 2 / Spatial resolution estimation of CBERS CCD camera
The first China-Brazil Earth Resources Satellite (CBERS-1) was launched in 1999 and was substituted on 2003 by CBERS-2. CBERS- 1 and CBERS-2 have the same specifications and carry three sensors: a Wide Field Imager (WFI), a High Resolution CCD Camera (CCD) and an Infrared Multispectral Scanner (IRMSS). Due to the limitations of the sensor components (diffrac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/03/2005
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21. Evaluation of the quality in a cohesive argisolic YELLOW LATOSOL - lax over the tableland soil, under a natural forest / Avaliação da qualidade de um LATOSSOLO AMARELO Coeso argissólico dos Tabuleiros Costeiros,sob floresta natural
The soil is a natural resource, whose functions in the healthy atmosphere are essential for the maintenance and development of life in the planet. Its capacity to function appropriately as substratum for vegetables filter and lid of residues, regulator of the flow of gases, water and energy is defined as the soil quality. The determination of the soil qualit
Publicado em: 2005
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22. Transfer function based methodology to preprocessing digital mammographic image and its application on computer-aided diagnosis schemes / Metodologia baseada nas funções de transferência para pré-processamento de imagens mamográficas digitais e sua aplicação em esquema computacional de auxílio ao diagnóstico
The purpose of this work is to evaluate the quality of radiological equipment and their images in order to use these evaluations to improve the performance of a computer-aided diagnosis (CAD) scheme. The mean idea is about the development of image processing techniques to enhance digital mammograms according to the characteristics of the X-ray unit used for
Publicado em: 2005
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23. Restauração de imagens do satélite Landsat-7. / Restoration of LANDSAT-7 satellite images.
The techniques of image restoration are oriented for the modeling of the degradation and recovery of the original signal that was degraded during the process of image formation. In Remote Sensing, sensor?s nominal spatial resolution, that defines the precision with which details of objects of interest in the image are perceivable, is one of the most importa
Publicado em: 2003
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24. Design and testing of ECE radiometer for Sinp-Tokamak
A multi channel ECE Radiometer, in the frequency range of 75 - 110 GHz, has been designed, constructed and tested for the SINP-Tokamak to diagnose second harmonic X-mode electron cyclotron emission (ECE). This frequency range covers approximately 80% of the plasma cross section in case of a magnetic eld of B = 1.5 T. For the maximum field of the SINP-Tokamak
Brazilian Journal of Physics. Publicado em: 2002-03