• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 2
  • Tagged with
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Multifoveamento em multirresolu??o com f?veas m?veis

Medeiros, Petr?cio Ricardo Tavares de 20 July 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-14T21:32:46Z No. of bitstreams: 1 PetrucioRicardoTavaresDeMedeiros_DISSERT.pdf: 5937912 bytes, checksum: c98c0e639d8348140e2635081d9744f4 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-15T22:29:35Z (GMT) No. of bitstreams: 1 PetrucioRicardoTavaresDeMedeiros_DISSERT.pdf: 5937912 bytes, checksum: c98c0e639d8348140e2635081d9744f4 (MD5) / Made available in DSpace on 2017-03-15T22:29:35Z (GMT). No. of bitstreams: 1 PetrucioRicardoTavaresDeMedeiros_DISSERT.pdf: 5937912 bytes, checksum: c98c0e639d8348140e2635081d9744f4 (MD5) Previous issue date: 2016-07-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O foveamento ? uma t?cnica de vis?o computacional capaz de promover a redu??o da informa??o visual atrav?s de uma transforma??o da imagem, em dom?nio espacial, para o dom?nio de multirresolu??o. Entretanto, esta t?cnica se limita a uma ?nica f?vea com mobilidade dependente do contexto. Neste trabalho s?o propostas a defini??o e a constru??o de um modelo multifoveado denominado MMMF (multifoveamento em multirresolu??o com f?veas m?veis) baseado em um modelo anterior denominado MMF (multirresolu??o com f?vea m?vel). Em um contexto de m?ltiplas f?veas, a aplica??o de v?rias estruturas MMF, uma para cada f?vea, resulta em um consider?vel aumento de processamento, uma vez que h? interse??es entre regi?es de estruturas distintas, as quais s?o processadas m?ltiplas vezes. Dadas as estruturas de f?veas MMF, propomos um algoritmo para obter regi?es disjuntas que devem ser processadas, evitando regi?es redundantes e, portanto, reduzindo o tempo de processamento. Experimentos s?o propostos para validar o modelo e verificar a sua aplicabilidade no contexto de vis?o computacional. Resultados demonstram o ganho em termos de tempo de processamento do modelo proposto em rela??o ao uso de m?ltiplas f?veas do modelo MMF. / Foveation is a computer vision technique for visual information reduction obtained by applying an image transformation in the spatial domain to the multiresolution domain. However, this technique is limited to a single fovea context-dependent mobility. This work proposes the definition and the construction of a multifoveated model called MMMF (Multiresolution Multifoveation using Mobile Foveae) based on an earlier model called MMF (Multiresolution with Moving Fovea). In the context of multiple foveae, the application of various MMF structures, one for each fovea, results in an increase in processing time, since there are intersections between regions of different structures, which are processed multiple times. Given MMF structures, an algorithm in order to get disjoint regions which are to be processed is proposed, avoiding redundant regions and thereby reducing the processing time. Experiments are proposed to validate the model and to verify its applicability in the computer vision context. Results show the gain in processing time of the proposed model compared to the use of multiple MMF structures.
2

Reconhecimento eficiente de objetos usando multifoveamento em nuvem de pontos 3D

Oliveira, F?bio Fonseca de 03 July 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-03-12T13:20:56Z No. of bitstreams: 1 FabioFonsecaDeOliveira_DISSERT.pdf: 13806860 bytes, checksum: a622440d82c100fbdf5477635a9da0a1 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-03-13T21:12:27Z (GMT) No. of bitstreams: 1 FabioFonsecaDeOliveira_DISSERT.pdf: 13806860 bytes, checksum: a622440d82c100fbdf5477635a9da0a1 (MD5) / Made available in DSpace on 2018-03-13T21:12:27Z (GMT). No. of bitstreams: 1 FabioFonsecaDeOliveira_DISSERT.pdf: 13806860 bytes, checksum: a622440d82c100fbdf5477635a9da0a1 (MD5) Previous issue date: 2017-07-03 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / As inova??es tecnol?gicas no campo de hardwares e sensores 3D permitiram realizar a aquisi??o de nuvens de pontos 3D em tempo real. Como consequ?ncia, surgiram variedades de aplica??es interativas relacionadas ao mundo 3D que cada vez mais v?m recebendo aten??o dos pesquisadores. No entanto, um dos principais problemas que ainda permanece ? o processamento computacionalmente intensivo que exige abordagens otimizadas para lidar com esse modelo de vis?o 3D, especialmente quando ? necess?rio realizar tarefas em tempo real. Assim sendo, partimos da proposta de um modelo de multirresolu??o 3D apresentado como nuvens de pontos foveada que ? uma poss?vel solu??o para esse problema, mas se limita a uma ?nica estrutura foveada com mobilidade dependente do contexto. Desse modo a nossa proposta ? um aperfei?oamento desse modelo com a incorpora??o de m?ltiplas estruturas foveadas. Entretanto, a uni?o de v?rias estruturas foveadas resulta em um consider?vel aumento de processamento, uma vez que h? interse??es entre regi?es de estruturas distintas, as quais s?o processadas m?ltiplas vezes. Solucionamos esse problema propondo um modelo de multifoveamento que considera as interse??es durante a uni?o das estruturas foveadas. Tal modelo pode ser usado para identificar objetos em nuvens de pontos 3D, uma das tarefas chaves para a automa??o, com sincroniza??o eficiente, permitindo a valida??o do modelo e verifica??o da sua aplicabilidade no contexto de vis?o computacional. Os resultados demonstraram um ganho em desempenho do modelo de multifoveamento proposto em rela??o ao uso de m?ltiplas estruturas foveadas do modelo de nuvens de pontos. / Technological innovations in the field of hardware and 3D sensors allowed real time 3D point clouds acquisition. Therefore, varieties of interactive applications related to the 3D world that have been receiving increasing attention from researchers, arisen. However, one of the main problems that remains is the computationally intensive processing that requires optimized approaches to deal with this 3D vision model, especially when it is necessary to perform tasks in real time. Thus, we started from a proposed 3D multiresolution model presented as foveated point clouds which is a possible solution to this problem, but is limited to a single foveated structure with context dependent mobility. In this way, our proposal is an improvement of this model with the incorporation of multiple foveated structures. However, the union of several foveated structures results in a considerable increase of processing, since there are intersections between regions of distinct structures, which are processed multiple times. We address this problem by using a proposed multifoveated model that regards intersections on the union procedure. Such approach can be used to identify objects in 3D point clouds, one of the key tasks for automation, with efficient synchronization, allowing the validation of the model and verification of its applicability in the context of computer vision. The results demonstrate a gain in performance of the proposed model in relation to the use of multiple structures of the foveated point cloud model.

Page generated in 0.0446 seconds