Image Based Detector
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Reconhecimento de texto e rastreamento de objetos 2D/3D / Text recognition and 2D/3D object tracking
In this thesis we address three computer vision problems: (1) the detection and recognition of flat text objects in images of real scenes; (2) the tracking of such text objects in a digital video; and (3) the tracking an arbitrary three-dimensional rigid object with known markings in a digital video. For each problem we developed innovative algorithms, which
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/03/2012
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2. A novel method for generating scale space kernels based on wavelet theory
The linear scale-space kernel is a Gaussian or Poisson function. These functions were chosen based on several axioms. This representation creates a good base for visualization when there is no information (in advanced) about which scales are more important. These kernels have some deficiencies, as an example, its support region goes from minus to plus infini
Publicado em: 2010
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3. Controle feedback de nível baseado em sensor de imagem aplicado ao equipamento misturador-decantador à inversão de fases (MDIF) / Level feedback control using an image-based detector applied to a mixer-settler based on phase inversion equipment (MDIF).
O tratamento de águas residuais contaminadas com óleo é um assunto de grande interesse prático, principalmente no que se refere às questões ambientais. Um processo bastante relevante que vem sendo estudado no tratamento semi-contínuo de águas contaminadas com óleo é o Misturador-Decantador à Inversão de Fases (MDIF). Uma variável importante na o
Publicado em: 2009
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4. Um sistema para detecção e reconhecimento de face em vídeo utilizando a transformada cosseno discreta
Human face has a very complex and variable pattern, which makes the face detection and recognition operations a challenging problem. The scope of these operations is quite comprehensive, involving mainly security applications, such as authorization for physical and logical access, people tracking, and real time authentication. In addition to security applica
Publicado em: 2009
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5. Utilização de equações diferenciais parciais para eliminação de ruídos e detecção de bordas
The edge detection of digital images is a research field that has attracted great interest from the scientific community. Their applications go from the automatic inspection and quality control of industrial piece to the diagnosis of malignancy of cancerous tumors. However, many existing edge detectors have problems related to false edge detection. In this c
Publicado em: 2008
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6. 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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7. Simulações do ruído de fundo instrumental e reconstrução de imagens do experimento protoMIRAX / Simulations of the instrumental background and image reconstruction of the protoMIRAX experiment
In this thesis, the results of detailed and realistic simulations performed with a Monte Carlo simulation code for gamma-ray Astronomy (MGGPOD) to predict the response of protoMIRAX are presented. The protoMIRAX is a project under development by the High Energy Astrophysics group of INPE, in which a hard X-ray camera is being built based on the coded apertur
Publicado em: 2008
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8. Shape descriptiors based on Tensor Scale / Descritores de forma baseados em Tensor Scale
Recentemente o número de coleções de imagens disponíveis vem crescendo. Conseqüentemente, surge a demanda por sistemas de informação para armazenamento, indexação e busca destas imagens. Uma das principais soluções adotadas é a utilização de sistemas de recuperação de imagem por conteúdo que possuem a habilidade de, dada uma imagem de consul
Publicado em: 2007
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9. Development of a CCD-based image acquiring system for neutrons at the Argonauta Reactor
A thermal neutron image acquiring system is being developed at the Instituto de Engenharia Nuclear-IEN (CNEN). This system would be capable to perform non-destructive assays after 2D images acquired on a real or quasi real time basis as well as 3D tomographic images reconstructed from the two-dimensional ones. The source-detector set is constituted by the Ar
Brazilian Journal of Physics. Publicado em: 2005-09
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10. Development and applications of three-dimensional gamma ray tomography system using ray casting volume rendering techniques
Computed Tomography (CT) has made possible visualization of physical structures in the interior of an object in their real relative spatial position and orientation. Another important contribution of CT is to greatly improve abilities to distinguish regions with different gamma ray transmittance and to separate over-lying structures. The mathematical problem
Brazilian Journal of Physics. Publicado em: 2005-09
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11. Proton CT setup at CV-28 of IEN/CNEN
Although the idea of proton Computed Tomography (pCT) is not new, it is currently not available. It is still unknown if the image quality of pCT is sufficient for localizing tumors and if the accuracy of proton range calculations surpass that of X-ray CT based range calculations without significantly increasing the patient exposure. The spatial resolution of
Brazilian Journal of Physics. Publicado em: 2005-09
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12. The use of gamma ray computed tomography to investigate soil compaction due to core sampling devices
Compaction processes can influence soil physical properties such as soil density, porosity, pore size distribution, and processes like soil water and nutrient movements, root system distribution, and others. Soil porosity modification has important consequences like alterations in results of soil water retention curves. These alterations may cause difference
Brazilian Journal of Physics. Publicado em: 2004-09