Now showing items 1-20 of 44

    • A Hybrid Rendering Technique to Navigate in Large Terrains Using Mobile Devices 

      Noguera, José María; Segura, Rafael; Ogáyar, Carlos; Joan Arinyo, Robert (2010-09-08)
      Conference report
      Restricted access - publisher's policy
      We describe a hybrid client-server technique for remote adaptive streaming and rendering of large terrains in resource-limited mobile devices. The technique has been designed to achieve an interactive rendering performance ...
    • A survey of real-time crowd rendering 

      Beacco Porres, Alejandro; Pelechano Gómez, Núria; Andújar Gran, Carlos Antonio (2016-12)
      Article
      Open Access
      In this survey we review, classify and compare existing approaches for real-time crowd rendering. We first overview character animation techniques, as they are highly tied to crowd rendering performance, and then we analyze ...
    • A Volume Visualization Algorithm using a coherent Extended Weight Matrix 

      Tost Pardell, Daniela; Puig Puig, Anna; Navazo Álvaro, Isabel (1995-01)
      Article
      Restricted access - publisher's policy
      Direct cell-to-cell volume visualization algorithms, also called projective rendering methods, present the advantage of allowing semi-transparencies and, additionally, as they project all the samples, they avoid the ...
    • An octree isosurface codification based on discrete planes 

      Boada, Imma; Navazo Álvaro, Isabel (2001)
      Conference report
      Open Access
      Describes a method to code a decimated model of an isosurface on an octree representation while maintaining volume data if it is needed. The proposed technique is based on grouping the marching cubes (MC) patterns into ...
    • Automatic keyframe selection for high-quality image-based walkthrough animation using viewpoint entropy 

      Vázquez Alcocer, Pere Pau; Sbert Cassasayas, Mateu (2002-02)
      Article
      Open Access
      The computation of high quality animation sequences is expensive. Generation time for each frame can take a few hours Recently, Image-Based Rendering methods have been proposed to solve this problem. As these techniques ...
    • Automatic view selection using viewpoint entropy and its application to image-based modelling 

      Vázquez Alcocer, Pere Pau; Feixas, Miquel; Sbert Cassasayas, Mateu; Heidrich, Wolfgang (North Holland, 2003)
      Article
      Restricted access - publisher's policy
      In the last decade a new family of methods, namely Image-Based Rendering, has appeared. These techniques rely on the use of precomputed images to totally or partially substitute the geometric representation of the scene. ...
    • Avatars rendering and its effect on perceived realism in virtual reality 

      Molina López, Elena; Ríos Jerez, Alejandro; Pelechano Gómez, Núria (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Open Access
      Immersive virtual environments have proven to be a plausible platform to be used by multiple disciplines to simulate different types of scenarios and situations at a low cost. When participants are immersed in a virtual ...
    • Bandwidth reduction for remote navigation systems through view prediction and progressive transmission 

      Vázquez Alcocer, Pere Pau; Sbert Cassasayas, Mateu (Elsevier Science Direct, 2004)
      Article
      Restricted access - publisher's policy
      Remote navigation systems, such as exploration of virtual 3D worlds or remote surgery, usually require higher bandwidth than the Internet connection commonly available at home. In this paper,we explore a set of techniques ...
    • Bandwidth reduction techniques for remote navigation systems 

      Vázquez Alcocer, Pere Pau; Sbert Cassasayas, Mateu (2002)
      Conference report
      Restricted access - publisher's policy
      In this paper we explore a set of techniques to reduce the bandwidth in remote navigation systems. These systems, such as exploration of virtual 3D worlds or remote surgery, usually require higher bandwidth than the common ...
    • Computing maximal tiles and application to impostor-based simplification 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel; Rossignac, Jarek; Vinacua Pla, Álvaro (North Holland, 2004-08)
      Article
      Restricted access - publisher's policy
      The computation of the largest planar region approximating a 3D object is an important problem with wide applications in modeling and rendering. Given a voxelization of the 3D object, we propose an efficient algorithm to ...
    • Definition of standards-based building blocks for multimedia content management 

      Llorente Viejo, Silvia; Delgado Mercè, Jaime; Maroñas Borras, Xavier; Florido Moreno, Jonathan (2015-09)
      Article
      Open Access
      The emergence of new ways of rendering multimedia content from a multiplicity of devices like tablets, smartphones, consoles or smart TVs, opens a complete set of new opportunities for multimedia services providers. It is ...
    • Downsampling methods for medical datasets 

      Díaz García, Jesús; Brunet Crosa, Pere; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (IADIS Press, 2017)
      Conference report
      Open Access
      Volume visualization software usually has to deal with datasets that are larger than the GPUs may hold. This is especially true in one of the most popular application scenarios: medical visualization. Typically, medical ...
    • Eliminating redundant fragment shader executions on a mobile GPU via hardware memoization 

      Arnau Montañés, José María; Parcerisa Bundó, Joan Manuel; Xekalakis, Polychronis (2014)
      Conference report
      Restricted access - publisher's policy
      Redundancy is at the heart of graphical applications. In fact, generating an animation typically involves the succession of extremely similar images. In terms of rendering these images, this behavior translates into the ...
    • Enhancing collaboration in virtual reality applications 

      Theoktisto, Víctor; Fairén González, Marta (2005-10)
      Article
      Restricted access - publisher's policy
      We derive a complete component framework for transforming standalone virtual reality (VR) applications into fullfledged multithreaded collaborative virtual reality environments (CVREs), after characterizing existing ...
    • Feature-preserving downsampling for medical images 

      Díaz García, Jesús; Brunet Crosa, Pere; Navazo Álvaro, Isabel; Pérez, Frederic; Vázquez Alcocer, Pere Pau (European Association for Computer Graphics (Eurographics), 2015)
      Conference lecture
      Open Access
      In the medical imaging field, interactive direct volume rendering of large volume datasets is a challenging task. Multi-resolution techniques deal with this problem by downsampling the original dataset to produce coarser ...
    • Hardware and software improvements of volume splatting 

      Vergés Garcia, Eduard; Grau Carrión, Sergi; Tost Pardell, Daniela (2006-05)
      External research report
      Open Access
      This paper proposes different hardware-based acceleration of the three classical splatting strategies: emph{composite-every-sample}, emph{object-space sheet-buffer} and emph{image-space sheet-buffer}.
    • High quality illustrative effects for molecular rendering 

      Hermosilla Casajús, Pedro; Guallar, Víctor; Vinacua Pla, Álvaro; Vázquez Alcocer, Pere Pau (2016-02)
      Article
      Restricted access - publisher's policy
      All-atom simulations are crucial in biotechnology. In Pharmacology, for example, molecular knowledge of protein-drug interactions is essential in the understanding of certain pathologies and in the development of improved ...
    • Hybrid Rugosity Mesostructures (HRMs) for fast and accurate rendering of fine haptic detail 

      Theoktisto, Víctor; Fairén González, Marta; Navazo Álvaro, Isabel (Centro Latinoamericano de Estudios en Informática, 2010)
      Article
      Open Access
      The haptic rendering of surface mesostructure (fine relief features) in dense triangle meshes requires special structures, equipment, and high sampling rates for detailed perception of rugged models. Low cost approaches ...
    • Image-based modeling using viewpoint entropy 

      Vázquez Alcocer, Pere Pau; Feixas, Miquel; Sbert Cassasayas, Mateu; Heidrich, Wolfgang (2002)
      Conference report
      Open Access
      We present a new method to automatically determine the correct camera placement positions in order to obtain a minimal set of views for Image-Based Rendering. The viewpoints should cover all visible polygons with an adequate ...
    • Image-based tree variations 

      Argudo Medrano, Óscar; Andújar Gran, Carlos Antonio; Chica Calaf, Antonio (2020-02)
      Article
      Open Access
      The automatic generation of realistic vegetation closely reproducing the appearance of specific plant species is still a challenging topic in computer graphics. In this paper, we present a new approach to generate new tree ...