Examinando por Materia "Data processing"

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    Aspectos a tener en cuenta para una legislación sobre el tratamiento de datos de niños niñas y adolescentes en redes sociales : un análisis desde el derecho comparado
    (Universidad EAFIT, 2023) Quintero Toro, Jorge Daniel; Higuita Olaya, Daniel
    Digital social networks and access to technology have transcended the physical barriers under which information was observed. People is increasingly connected and has higher access to information, what is also increasing the risks they face on-the-grid. This is partly because of the way in which social networks are using artificial intelligence to collect data generated from user’s interactions with the network. Such information is being used to profile users for future advertising or simply to keep them connected for longer periods, so the artificial intelligence can learn more from the way the user interacts with the network. Colombian law prohibits the collection of personal data of children and adolescents. However, this prohibition has no effect, because there is easy access to digital social networks. This implies risks that can be mitigated with more efficient laws that are consistent with current reality. This entails risks for children and adolescents who, depending on their mental maturity and decision-making capacity, may or may not be able to assume these risks. Some of the risks to which children and adolescents can be subjected are the radicalization of thoughts, limiting the free development of the personality, habeas data, extortion or sexual crimes. This research becomes relevant because there are no studies about this, which implies many social risks by directly influencing the future of society such as children and adolescents.
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    Face reconstruction with structured light
    (INSTICC-INST SYST TECHNOLOGIES INFORMATION CONTROL & COMMUNICATION, 2011-01-01) Congote, J.; Barandiaran, I.; Barandiaran, J.; Nieto, M.; Ruiz, O.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAE
    This article presents a methodology for reconstruction of 3D faces which is based on stereoscopic images of the scene using active and passive surface reconstruction. A sequence of Gray patterns is generated, which are projected onto the scene and their projection recorded by a pair of stereo cameras. The images are rectified to make coincident their epipolar planes and so to generate a stereo map of the scene. An algorithm for stereo matching is applied, whose result is a bijective mapping between subsets of the pixels of the images. A particular connected subset of the images (e.g. the face) is selected by a segmentation algorithm. The stereo mapping is applied to such a subset and enables the triangulation of the two image readings therefore rendering the (x,y,z) points of the face, which in turn allow the reconstruction of the triangular mesh of the face. Since the surface might have holes, bilateral filters are applied to have the holes filled. The algorithms are tested in real conditions and we evaluate their performance with virtual datasets. Our results show a good reconstruction of the faces and an improvement of the results of passive systems.
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    Low altitude wind simulation over mount saint helens using NASA SRTM digital terrain model
    (2007-01-01) Garcia, M.J.; Boulanger, P.; Garcia, M.J.; Boulanger, P.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
    On February 11, 2000, the Shuttle Radar Topography Mission (SRTM) was launched into space as part of one of the pay load of the Shuttle Endeavor. Using a new radar sweeping technique most of the Earth's surfaces was digitized in 3D in approximately 10 days. SRTM acquired enough data during its mission to obtain a near-global high-resolution database of the Earth's topography. This paper describe how this revolutionary data set can be used to simulate anywhere around the Earth low altitude wind conditions for various atmospheric conditions. More specifically, we will describe the various processing steps necessary to convert this high-resolution terrain model provided by the SRTM database into a Computational Fluid Dynamic (CFD) volumetric mesh that is compatible with an open source CFD solver called OpenFOAM running in parallel on large West-Grid supercomputers. This work is the result of a new virtual wind-tunnel under development at the University of Alberta. In the paper, we present wind flow over the MountSaint Helens in the United States for a simple wind flow boundary condition. © 2006 IEEE.