Examinando por Autor "Ruiz OE"
Mostrando 1 - 18 de 18
Resultados por página
Opciones de ordenación
Ítem Evaulation of interest point detectors for image information extraction(2012-01-01) Barandiarian, Inigo; Goenetxea, Jon; Congote, John; Ruiz OE; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEInterest points extraction and matching is a common task in many computer vision based application, which are used in different domains, such as 3D reconstruction, object recognition, or tracking. We present an evaluation of current state of the art aboutÍtem An Extended G-Code Language with Flow Control, Functions and Mnemonic Variables(World Academy of Science Engineering and Technology, 2012-01-01) Ruiz OE; Arroyave-Tobón, S.; Cardona-McCormick, Juan F.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEIn the context of computer numerical control (CNC) and computer aided manufacturing (CAM), the capabilities of programming languages such as symbolic and intuitive programming, program portability and geometrical portfolio have special importance.Ítem Extending marching cubes with adaptative methods to obtain more accurate iso-surfaces(2010-01-01) Congote, John; Moreno, Aitor; Barandiaran, Inigo; Barandiaran, Javier; Ruiz OE; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEÍtem Finite Element Modeling of Composite Materials using Kinematic Constraints(Fondo Editorial Universidad EAFIT, 2009-12-01) Merlin Barschke; Externo Otras Dependencias; Ruiz OE; Jens Jensen; Carlos A. LÓPEZ Cañas; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThe purpose of this article is to present computer simulations of composite materials based not in experimental data (however necessary in a future work) but on kinematicconstraints introduced among the fibers themselves and between the fibersÍtem Force-Displacement Model of Compliant Mechanisms using Assur Sub-Chains(Member Organization Mexico of IFToMM, 2011-11-01) Durango, Sebastian; Correa, Jorge; Ruiz OE; Restrepo, J.; Achiche, Sofiane; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThis article develops a modular procedureto perform force-displacement modeling of planar ?exure-based compliant mechanisms (CMs). The procedure ismostly suitable for planar lumped CMs.Ítem Gabriel-constrained Parametric Surface Triangulation(InTech, 2009-11-01) Ruiz OE; Externo Otras Dependencias; Cadavid, C.; Lalinde Pulido, J.G.; Externo Otras Dependencias; Beatriz Defez-Garcia; Ricardo SerranoThe Boundary Representation of a 3D manifold contains FACES (connected subsets of a parametric surface S( ): R2 -> R3). In many science and engineering applications it is cumbersome and algebraically difficult to deal with the polynomialÍtem Gabriel-constrained Parametric Surface Triangulation(InTech, 2009-11-01) Ruiz OE; Externo Otras Dependencias; Cadavid, C.; Lalinde Pulido, J.G.; Externo Otras Dependencias; Beatriz Defez-Garcia; Ricardo Serrano; Ruiz OE; Externo Otras Dependencias; Cadavid, C.; Lalinde Pulido, J.G.; Externo Otras Dependencias; Beatriz Defez-Garcia; Ricardo Serrano; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las ComunicacionesThe Boundary Representation of a 3D manifold contains FACES (connected subsets of a parametric surface S( ): R2 -> R3). In many science and engineering applications it is cumbersome and algebraically difficult to deal with the polynomialÍtem Gabriel-constrained Parametric Surface Triangulation(InTech, 2009-11-01) Ruiz OE; Externo Otras Dependencias; Cadavid, C.; Lalinde Pulido, J.G.; Externo Otras Dependencias; Beatriz Defez-Garcia; Ricardo Serrano; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThe Boundary Representation of a 3D manifold contains FACES (connected subsets of a parametric surface S( ): R2 -> R3). In many science and engineering applications it is cumbersome and algebraically difficult to deal with the polynomialÍtem Hessian eigenfunctions for triangular mesh parameterization(SciTePress, 2016-02-27) Mejia, D.; Ruiz OE; Cadavid, C.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEHessian Locally Linear Embedding (HLLE) is an algorithm that computes the nullspace of a Hessian functional H for Dimensionality Reduction (DR) of a sampled manifold M. This article presents a variation of classic HLLE for parameterization of 3D triangular meshes. Contrary to classic HLLE which estimates local Hessian nullspaces, the proposed approach follows intuitive ideas from Differential Geometry where the local Hessian is estimated by quadratic interpolation and a partition of unity is used to join all neighborhoods. In addition, local average triangle normals are used to estimate the tangent plane TxM at x ? M instead of PCA, resulting in local parameterizations which reflect better the geometry of the surface and perform better when the mesh presents sharp features. A high frequency dataset (Brain) is used to test our algorithm resulting in a higher rate of success (96.63%) compared to classic HLLE (76.4%). © Copyright 2016 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.Ítem Hessian eigenfunctions for triangular mesh parameterization(SciTePress, 2016-02-27) Mejia, D.; Ruiz OE; Cadavid, C.; Mejia, D.; Ruiz OE; Cadavid, C.; Universidad EAFIT. Departamento de Ciencias; Matemáticas y AplicacionesHessian Locally Linear Embedding (HLLE) is an algorithm that computes the nullspace of a Hessian functional H for Dimensionality Reduction (DR) of a sampled manifold M. This article presents a variation of classic HLLE for parameterization of 3D triangular meshes. Contrary to classic HLLE which estimates local Hessian nullspaces, the proposed approach follows intuitive ideas from Differential Geometry where the local Hessian is estimated by quadratic interpolation and a partition of unity is used to join all neighborhoods. In addition, local average triangle normals are used to estimate the tangent plane TxM at x ? M instead of PCA, resulting in local parameterizations which reflect better the geometry of the surface and perform better when the mesh presents sharp features. A high frequency dataset (Brain) is used to test our algorithm resulting in a higher rate of success (96.63%) compared to classic HLLE (76.4%). © Copyright 2016 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.Ítem On The Critical Point Structure of Eigenfunctions Belonging to the First Nonzero Eigenvalue of a Genus Two Closed Hyperbolic Surface(Science Journal Publication, 2012-05-01) Carlos A. Cadavid; Osorno, María C.; Ruiz OE; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEWe develop a method based on spectral graph theory to approximate the eigenvalues and eigenfunctions of the Laplace-Beltrami operator of a compact riemannian manifold. The method is applied to a closed hyperbolic surface of genus twoÍtem On The Critical Point Structure of Eigenfunctions Belonging to the First Nonzero Eigenvalue of a Genus Two Closed Hyperbolic Surface(Science Journal Publication, 2012-05-01) Carlos A. Cadavid; Osorno, María C.; Ruiz OE; Carlos A. Cadavid; Osorno, María C.; Ruiz OE; Universidad EAFIT. Departamento de Ciencias; Matemáticas y AplicacionesWe develop a method based on spectral graph theory to approximate the eigenvalues and eigenfunctions of the Laplace-Beltrami operator of a compact riemannian manifold. The method is applied to a closed hyperbolic surface of genus twoÍtem REAL-TIME DEPTH MAP GENERATION ARCHITECTURE FOR 3D VIDEOCONFERENCING(IEEE, 2010-06-09) John Congote; Iñigo Barandiaran; Javier Barandiaran; Tomas Montserrat; Julien Quelen; Christian Ferran; Pere J. Mindan; Olga Mur; Francesc Tarres; Ruiz OE; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEIn this paper we present a reliable depth estimation system which works in real-time with commodity hardware. The system is specially intended for 3D visualization using autostereoscopic displays. The core of this work is an implementation of a modified version of the adaptive support-weight algorithm that includes highly optimized algorithms for GPU, allowing accurate and stable depth map generation. Our approach overcomes typical problems of live depth estimation systems such as depth noise and flickering. Proposed approach is integrated within the versatile GStreamer multimedia software platform. Accurate depth map estimation together with real-time performance make proposed approach suitable for 3D videoconferencing.Ítem Robust CT to US 3D-3D Registration by using Principal Component Analysis and Kalman Filtering(2015-01-01) Echeverría, Rebeca; Cortes, Camilo; Bertelnsen, Alvaro; Ruiz OE; Macia, Ivan; Florez, Julian; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEÍtem Symetrical Observability of Kinematic Parameters in Symmetrical Parallel Mechanisms(2012-07-13) Durango, Sebastián; Restrepo, David; Ruiz OE; Restrepo, John; Achiche, Sofiane; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThis article presents an application of symmetry group theory in kinematic identification of parallel mechanisms of nlegs legs.Ítem Upper limb posture estimation in robotic and virtual reality-based rehabilitation(HINDAWI PUBLISHING CORPORATION, 2014-07-08) Cortés C; Ardanza A; Molina-Rueda F; Cuesta-Gómez A; Unzueta L; Epelde G; Ruiz OE; De Mauro A; Florez J; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAENew motor rehabilitation therapies include virtual reality (VR) and robotic technologies. In limb rehabilitation, limb posture is required to (1) provide a limb realistic representation in VR games and (2) assess the patient improvement. When exoskeleton devices are used in the therapy, the measurements of their joint angles cannot be directly used to represent the posture of the patient limb, since the human and exoskeleton kinematic models differ. In response to this shortcoming, we propose a method to estimate the posture of the human limb attached to the exoskeleton. We use the exoskeleton joint angles measurements and the constraints of the exoskeleton on the limb to estimate the human limb joints angles. This paper presents (a) the mathematical formulation and solution to the problem, (b) the implementation of the proposed solution on a commercial exoskeleton system for the upper limb rehabilitation, (c) its integration into a rehabilitation VR game platform, and (d) the quantitative assessment of the method during elbow and wrist analytic training. Results show that this method properly estimates the limb posture to (i) animate avatars that represent the patient in VR games and (ii) obtain kinematic data for the patient assessment during elbow and wrist analytic rehabilitation. © 2014 Camilo Cortés et al.Ítem Upper Limb Robot Assisted Rehabilitation Platform Combining Virtual Reality, Posture Estimation and Kinematic Indices(Springer, 2016-10-13) Scorza, A; De los Reyes, A; Cortes, C; Ardanza, A; Bertelsen, A; Ruiz OE; Gil, A; Florez, J; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEUpper limb rehabilitation is critical for patients affected by spinal cord injury (SCI). Currently, robotics and Virtual Reality (VR) have changed the way in which rehabilitation therapies are provided.Ítem Volume Ray Casting in WebGL(InTech, 2012-03-01) Congote, John; Kabongo, Luis; Moreno, Aitor; Segura, Alvaro; Ruiz OE; Posada, Jorge; Beristain, Andoni; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEReal-time 3D computer graphics systems usually handle surface description models (i.e. BRep representations) and use surface rendering techniques for visualization. Common 3D model formats such as VRML, X3D, COLLADA, U3D (some intended for the Web)