Sub Pixel Accuracy
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Estudo dos erros sistemáticos inerentes a um sensor de estrelas de cabeça fixa, quando à localização relativa de estrelas / Study of systematic errors inherent to fixed-head star trackers with respect to the relative position of stars
Sensores de estrelas são sensores de atitude usados em veículos espaciais capazes de fornecer sua atitude com precisão da ordem de segundos de arco. A atitude é determinada quando as coordenadas das estrelas, medidas pelo sensor em seu sistema de coordenadas, são comparadas com as direções conhecidas de estrelas obtidas em um catálogo de estrelas. Po
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2005
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2. Estudo dos erros sistemáticos inerentes a um sensor de estrelas de cabeça fixa, quando à localização relativa de estrelas / Study of systematic errors inherent to fixed-head star trackers with respect to the relative position of stars
Star trackers are attitude sensors used in spacecrafts capable of providing accurate attitude in arc-seconds range. The attitude information is provided when the star coordinates, measured by the sensor in its frame, are compared with known star directions obtained from a star catalog. Nevertheless, as in all measurement instruments, the measures are likely
Publicado em: 2005
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3. Aplicação de logica fuzzy para estimativa de area plantada da cultura de soja utilizando imagens AVHRR-NOAA / Application of fuzzy logic for soybean crop area estimation using AVHRR-NOAA images
An early accurate estimation of agricultural crop areas, such as soybean, is fundamental for the Brazilian economy. The draining forecast and the estimation of agricultural production commercialization are strategic to Brazil, since they are directly related to planning, costs and price. Recent technological progress of data acquisition from orbital remote s
Publicado em: 2005
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4. In-plane strain measurement by digital image correlation
This paper presents a "fast and simple" (FAS) detection algorithm based on the digital image correlation for measurement of the surface deformation of planar objects. The proposed algorithm uses only fine search at the pixel level resolution and surface fitting for sub-pixel level. Two different specimens are investigated to explore the feasibility of this p
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-09