Encontrados 7 documentos, a visualizar página 1 de 1
Registration of pedobarographic images
Francisco Paulo Marques de Oliveira; Todd C. Pataky; João Manuel Ribeiro da Silva TavaresIn this study, we compare the performance of six fully automatic methods of within-subjects pedobarographic image registration: principal axes, modal matching, min(XOR), min(MSE), contours-based and frequency-based. These algorithms were tested on 30 control image pairs considered in previous studies. The accuracy was assessed by visual inspection and using the image similarity measures: exclusive-or (XOR) and ...
Alinhamento computacional de imagens de pedobarografia estática e dinâmica
Francisco Paulo Marques de Oliveira; João Manuel Ribeiro da Silva TavaresO alinhamento de imagens, isto é, o processo de transformação de uma imagem de modo que as estruturas representadas nessa imagem passem a estar ajustadas às estruturas homólogas representadas numa segunda imagem, é uma área de grande investigação em Visão Computacional. Na área médica, por exemplo, o alinhamento de imagens tem aplicações no auxílio ao diagnóstico, na fusão de informação contida em imagens obtid...
A versatile matching algorithm based on dynamic programming with circular order...
Francisco Paulo Marques de Oliveira; João Manuel Ribeiro da Silva Tavares; Todd C. PatakyThis paper presents an assignment algorithm with circular order preserving constraint. Given a cost affinity matrix and the desired percentage of correspondences, the algorithm implemented using dynamic programming determines the correspondence of type one-to-one of minimum global cost. Here, it was applied to optimize the global matching between two sets of ordered points that represent the contours of objects...
Rapid pedobarographic image registration based on contour curvature and optimiz...
Francisco Paulo Marques de Oliveira; João Manuel Ribeiro da Silva Tavares; Todd C. PatakyImage registration, the process of optimally aligning homologous structures in multiple images, has recently been demonstrated to support automated pixel-level analysis of pedobarographic images and, subsequently, to extract unique and biomechanically relevant information from plantar pressure data. Recent registration methods have focused on robustness, with slow but globally powerful algorithms. In this paper...
Matching contours in images using curvature information
Francisco Paulo Marques de Oliveira; João Manuel Ribeiro da Silva TavaresThe work here described consists in searching for the optimum global matching between contours of two objects represented in images, which are sampled by equal or different number of points. Thus, to determine the optimum global matching between the points of two contours, it is used curvature information, that is totally invariant to rigid transformations. For the case of contours sampled by different numbers ...
Computer analysis of objects’ movement in image sequences : methods and a...
João Manuel Ribeiro da Silva Tavares; Fernando Jorge Soares Carvalho; Francisco Paulo Marques de Oliveira; Maria João Medeiros de VasconcelosComputer analysis of objects’ movement in image sequences is a very complex problem, as it usually involves tasks for automatic detection, matching, tracking and deformation estimation. However, this computational analysis has a wide range of important applications; for instance, in surveillance systems, clinical analysis of human gait, objects recognition and deformation analysis. Due to the extent of pu...
Visualização Científica aplicada à Imagiologia Magnética, Matéria Condensada, O...
Sandra Marta Nobre Plecha; J.M. Teixeira; A.M. Pereira; Francisco Paulo Marques de Oliveira; João Manuel Ribeiro da Silva TavaresNeste artigo utiliza-se a biblioteca computacional VTK (Visualization ToolKit) em quatro domínios de aplicação distintos: imagiologia magnética, matéria condensada, oceanografia e campos eléctricos. Na área da imagiologia, a aplicação desenvolvida permite realizar algumas operações usuais de processamento de imagem, nomeadamente operações algébricas e de filtragem. No domínio da matéria condensada, foi elaborad...
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