Now showing items 41-60 of 67

    • NightLighting: a nocturnal urban illumination approach 

      Muñoz Pandiella, Imanol; Andújar Gran, Carlos Antonio; Patow, Gustavo Ariel (European Association for Computer Graphics (Eurographics), 2013)
      Conference report
      Restricted access - publisher's policy
      Real time rendering of cities with realistic global illumination is still an open problem. In this paper we propose a two-step algorithm to simulate the nocturnal illumination of a city. The first step computes an approximate ...
    • Omni-directional relief impostors 

      Andújar Gran, Carlos Antonio; Boo, J; Brunet Crosa, Pere; Fairén González, Marta; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Vinacua Pla, Álvaro (North Holland, 2007-07)
      Article
      Restricted access - publisher's policy
      Relief impostors have been proposed as a compact and high-quality representation for high-frequency detail in 3D models. In this paper we propose an algorithm to represent a complex object through the combination of ...
    • Optimal iso-surfaces 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel; Rossignac, Jarek; Vinacua Pla, Álvaro (2004-05)
      Article
      Open Access
      Since the publication of the original Marching Cubes algorithm, numerous variations have been proposed for guaranteeing water-tight constructions of triangulated approximations of iso-surfaces. Most approaches divide the ...
    • Optimizing the topological and combinatorial complexity of isosurfaces 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel; Rossignac, Jarek; Vinacua Pla, Álvaro (Elsevier, 2005-07)
      Article
      Open Access
      Since the publication of the original Marching Cubes algorithm, numerous variations have been proposed for guaranteeing water-tight constructions of triangulated approximations of isosurfaces. Most approaches divide the ...
    • Output-sensitive rendering of detailed animated characters for crowd simulation 

      Spanlang, Bernhard; Andújar Gran, Carlos Antonio; Pelechano Gómez, Núria; Beacco Porres, Alejandro (2010)
      Conference report
      Restricted access - publisher's policy
      Rendering detailed animated characters is a major limiting factor in crowd simulation. In this paper we present a new representation for 3D animated characters which supports output-sensitive rendering. Each character is ...
    • Pressing: Smooth isosurfaces with flats from binary grids 

      Chica Calaf, Antonio; Williams, J.; Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Navazo Álvaro, Isabel; Rossignac, J.; Vinacua Pla, Álvaro (2006-02)
      External research report
      Open Access
      We explore the automatic recovery of solids from their volumetric discretizations. In particular, we propose an approach, called Pressing, for smoothing isosurfaces extracted from binary volumes while recovering their large ...
    • 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 ...