Antonio Valério Netto

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OBJECTIVE To explore issues associated with measuring physical activity using the International Physical Activity Questionnaire (IPAQ)-long form in adults living in a mid-sized Brazilian city. METHODS A stratified random sampling procedure was used to select a representative sample of adults living in Rio Claro. This yielded 1572 participants who were(More)
This paper attempts to provide an overview of current market trends in industrial applications of VR (Virtual Reality) and VisSim (visual simulation) for the next few years. Several market studies recently undertaken are presented and commented. A profile of some companies that are starting to work with these technologies is provided, in an attempt to(More)
In this work we describe the architecture of a functional system capable of processing Hartmann-Shack (H-S) images of the human eye and analyzing them to automatically diagnose and measure the presence of refractive errors in the eye under exam. Image analysis relies on connectionist Artificial Intelligence techniques such as Neural Nets, Fuzzy Logic and(More)
This work presents the feature extraction module of a broader system designed to measure and interpret optical refractive errors (astigmatism, axis of astigmatism, near-and short-sightedness) from Hartmann-Shack (HS) images. This module, based on Gabor wavelets transform, takes an image data set and produces a reduced set of features, which will be later(More)
This work describes the feature extraction module of a system designed to measure and interpret optical refractive errors (astigmatism, axis of astigmatism, near-and short-sightedness) from Hartmann-Shack (HS) images. This module uses the Gabor wavelets transform to produce a reduced set of features from an image of the human eye that are then input to an(More)