Now showing items 41-60 of 60

  • Relief impostor selection for large scale urban rendering 

    Andújar Gran, Carlos Antonio; Díaz Iriberri, José; Brunet Crosa, Pere (2008)
    Conference lecture
    Open Access
    Image-based rendering techniques are often the preferred choice to accelerate the exploration of massive outdoor models and complex human-made structures. In the last few years, relief mapping has been shown to be extremely ...
  • Relief mapping on cubic cell complexes 

    Apaza, Karl; Andújar Gran, Carlos Antonio (2010)
    Conference report
    Open Access
    In this paper we present an algorithm for parameterizing arbitrary surfaces onto a quadrilateral domain defined by a collection of cubic cells. The parameterization inside each cell is implicit and thus requires storing ...
  • Robust topology simplification 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Ayala Vallespí, M. Dolors (2000-05)
    External research report
    Open Access
    This paper deals with simplification algorithms for generating coarse-level approximations of both geometrically and topologically complex models. Our main contribution is a new framework called DPS which models a family ...
  • See-through techniques for referential awareness in collaborative virtual reality 

    Argelaguet Sanz, Fernando; Kulik, Alexander; Kunert, André; Andújar Gran, Carlos Antonio; Froehlich, Bernd (2011)
    Article
    Restricted access - publisher's policy
    Multi-user virtual reality systems enable natural collaboration in share virtual worlds. Users can talk to each other, gesture and point into the virtual scenery as if it were real. As in reality, refer ring to objects ...
  • Segmentation of aerial images for plausible detail synthesis 

    Argudo Medrano, Óscar; Comino Trinidad, Marc; Chica Calaf, Antonio; Andújar Gran, Carlos Antonio; Lumbreras, Felipe (2018-04-01)
    Part of book or chapter of book
    Open Access
    The visual enrichment of digital terrain models with plausible synthetic detail requires the segmentation of aerial images into a suitable collection of categories. In this paper we present a complete pipeline for segmenting ...
  • Sensor-aware normal estimation for point clouds from 3D range scans 

    Comino Trinidad, Marc; Andújar Gran, Carlos Antonio; Chica Calaf, Antonio; Brunet Crossa, Pere (2018)
    Article
    Restricted access - publisher's policy
    Normal vectors are essential for many point cloud operations, including segmentation, reconstruction and rendering. The robust estimation of normal vectors from 3D range scans is a challenging task due to undersampling and ...
  • Single-picture reconstruction and rendering of trees for plausible vegetation synthesis 

    Argudo Medrano, Óscar; Chica Calaf, Antonio; Andújar Gran, Carlos Antonio (2016-06-01)
    Article
    Open Access
    State-of-the-art approaches for tree reconstruction either put limiting constraints on the input side (requiring multiple photographs, a scanned point cloud or intensive user input) or provide a representation only suitable ...
  • Space efficient connectivity test for n-dimensional images 

    Andújar Gran, Carlos Antonio (1998-08)
    Article
    Restricted access - publisher's policy
    An image is a discrete array whose elements, called points, represent some property. Images are broadly used in computer graphics. In 2D graphics applications, color, depth and other image properties are frequently used. ...
  • Terrain super-resolution through aerial imagery and fully convolutional networks 

    Argudo Medrano, Óscar; Chica Calaf, Antonio; Andújar Gran, Carlos Antonio (2018-05-22)
    Article
    Restricted access - publisher's policy
    Despite recent advances in surveying techniques, publicly available Digital Elevation Models (DEMs) of terrains are low-resolution except for selected places on Earth. In this paper we present a new method to turn ...
  • The discretized polyhedra simplification (DPS): a framework for polyhedra simplification based on decomposition schemes 

    Andújar Gran, Carlos Antonio; Ayala Vallespí, M. Dolors; Brunet Crosa, Pere (1999-01)
    External research report
    Open Access
    This work discusses simplification algorithms for the generation of a multiresolution family of solid representations from an initial polyhedral solid. We introduce the Discretized Polyhedra Simplification (DPS), a framework ...
  • The ViRVIG institute 

    Andújar Gran, Carlos Antonio; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Patow, Gustavo Ariel; Pueyo Sandez, Francesc Xavier (2011-11-16)
    Article
    Open Access
    In this paper we present the ViRVIG Institute, a recently created institution that joins two well-known research groups: MOVING in Barcelona, and GGG in Girona. Our main research topics are Virtual Reality devices and ...
  • Top-down model fitting for hand pose recovery in sequences of depth images 

    Madadi, Meysam; Escalera, Sergio; Carruesco Llorens, Àlex; Andújar Gran, Carlos Antonio; Baró, Xavier; Gonzàlez, Jordi (2018-11)
    Article
    Restricted access - publisher's policy
    State-of-the-art approaches on hand pose estimation from depth images have reported promising results under quite controlled considerations. In this paper we propose a two-step pipeline for recovering the hand pose from a ...
  • Topographic map visualization from adaptively compressed textures 

    Andújar Gran, Carlos Antonio (North Holland, 2010)
    Article
    Open Access
    Raster-based topographic maps are commonly used in geoinformation systems to overlay geographic entities on top of digital terrain models. Using compressed texture formats for encoding topographic maps allows reducing ...
  • Topology-reducing surface simplification using a discrete solid representation 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Ayala Vallespí, M. Dolors (2002-04)
    Article
    Restricted access - publisher's policy
    This paper presents a new approach for generating coarse-level approximations of topologically complex models. Dramatic topology reduction is achieved by converting a 3D model to and from a volumetric representation. Our ...
  • Tree variations 

    Argudo Medrano, Óscar; Andújar Gran, Carlos Antonio; Chica Calaf, Antonio (2017)
    Conference report
    Open Access
    The cost-effective generation of realistic vegetation is still a challenging topic in computer graphics. The simplest representation of a tree consists of a single texture-mapped billboard. Although a tree billboard does ...
  • Visual feedback techniques for virtual pointing on stereoscopic displays 

    Argelaguet Sanz, Fernando; Andújar Gran, Carlos Antonio (2009)
    Conference report
    Restricted access - publisher's policy
    The act of pointing to graphical elements is one of the fundamental tasks in Human-Computer Interaction. In this paper we analyze visual feedback techniques for accurate pointing on stereoscopic displays. Virtual feedback ...
  • Visualization of large-scale urban models through multi-level relief impostors 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel (North Holland, 2010-12)
    Article
    Restricted access - publisher's policy
    In this paper, we present an efficient approach for the interactive rendering of large-scale urban models, which can be integrated seamlessly with virtual globe applications. Our scheme fills the gap between standard ...
  • VR-assisted architectural design in a heritage site: the Sagrada Família case study 

    Andújar Gran, Carlos Antonio; Brunet Crossa, Pere; Buxareu, Jeronimo; Fons Sánchez, Joan; Laguarda, Narcis; Pascual, Jordi; Pelechano Gómez, Núria (European Association for Computer Graphics (Eurographics), 2018)
    Conference report
    Open Access
    Virtual Reality (VR) simulations have long been proposed to allow users to explore both yet-to-built buildings in architectural design, and ancient, remote or disappeared buildings in cultural heritage. In this paper we ...
  • Way-finder: guided tours through complex walkthrough models 

    Andújar Gran, Carlos Antonio; Vázquez Alcocer, Pere Pau; Fairén González, Marta (North Holland, 2004-09)
    Article
    Restricted access - publisher's policy
    The exploration of complex walkthrough models is often a difficult task due to the presence of densely occluded regions which pose a serious challenge to online navigation. In this paper we address the problem of algorithmic ...
  • World-in-miniature interaction for complex virtual environments 

    Trueba Hornero, Ramón; Andújar Gran, Carlos Antonio; Argelaguet Sanz, Fernando (IGI Global, 2010-12)
    Article
    Open Access
    Object occlusion is a major handicap for efficient interaction with 3D virtual environments. The well-known World in Miniature (WIM) metaphor partially solves this problem by providing an additional dynamic view point ...