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Ara es mostren els items 33-52 de 114

    • Data structures and algorithms for navigation in highly polygon-populated scenes 

      Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel; Brunet Crosa, Pere (1998-10)
      Report de recerca
      Accés obert
      We present the visibility octree, a new data structure to accelerate 3D navigation through very complex scenes. Our approach employs a conservative visibility technique to compute an approximation to the visibility space ...

    • Directional adaptive surface triangulation 

      Vigo Anglada, Marc; Pla García, Núria; Brunet Crosa, Pere (1999-02)
      Article
      Accés restringit per política de l'editorial
      Several CAD applications require a surface model of the modeled object consisting of a mesh of triangular facets. In this paper, a new algorithm for triangulation of trimmed surfaces is presented. The algorithm generates ...

    • Disseny gràfic interactiu mitjançant funcions Spline 

      Garcia de Pedro, Enric; Brunet Crosa, Pere; Alabau, Antonio (Marcombo, 1981)
      Text en actes de congrés
      Accés obert
      En el present article s'exposen en primer lloc els algorismes més utilitzats per a la obtenció de corbes i superfícies d'interpolació. A continuació es presenta un programa de disseny interactiu que fa servir splines ...

    • Distance constraint satisfaction based on geometric relaxation 

      Solano Albajés, Lluís; Brunet Crosa, Pere (2000-10)
      Report de recerca
      Accés obert
      In this raport, we characterize the family of 2D models with distance and angle constraints that can be transformed into equivalent models defined only in terms of distance constraints. The transformation process ...

    • Downsampling and storage of pre-computed gradients for volume rendering 

      Díaz García, Jesús; Brunet Crosa, Pere; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (European Association for Computer Graphics (Eurographics), 2017)
      Text en actes de congrés
      Accés obert
      The way in which gradients are computed in volume datasets influences both the quality of the shading and the performance obtained in rendering algorithms. In particular, the visualization of coarse datasets in multi-resolution ...

    • Downsampling methods for medical datasets 

      Díaz García, Jesús; Brunet Crosa, Pere; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (IADIS Press, 2017)
      Text en actes de congrés
      Accés obert
      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 ...

    • Error-aware construction and rendering of multi-scan panoramas from massive point clouds 

      Comino Trinidad, Marc; Andújar Gran, Carlos Antonio; Chica Calaf, Antonio; Brunet Crosa, Pere (2016-09-30)
      Article
      Accés obert
      Obtaining 3D realistic models of urban scenes from accurate range data is nowadays an important research topic, with applications in a variety of fields ranging from Cultural Heritage and digital 3D archiving to monitoring ...

    • Estimació de paràmetres de sistemes dinàmics utilitzant tècniques de filtratge 

      Brunet Crosa, Pere (Universitat Politècnica de Barcelona. Centre de Càlcul, 1979-03)
      Article
      Accés obert
      El control de sistemes és tant més acurat com més precís és el model matemàtic del sistema controlat. En molts casos, això només es pot aconseguir amb un algorisme d'estimació en temps real dels seus paràmetres; i quan el ...

    • Estructuras geométricas jerárquicas para la modelización de escenas 3D 

      Brunet Crosa, Pere; Santisteve i Puyuelo, Francesc; Vilanova, Anna; Chiarabini, Luca; Patow, Gustavo Ariel; Staffetti, E.; Surinyac Albareda, Jordi (1999-04)
      Report de recerca
      Accés obert
      This work surveys on the principal hierarchical geometric structures used to represent 3D scenes. We also present the basic algorithms to work with them, an overview on some recent works and a comparative discussion. This ...

    • Face octrees: involved algorithms and applications 

      Brunet Crosa, Pere (1990)
      Report de recerca
      Accés obert
      Volume models can be effectively represented by means of octree structures, that recursively subdivide the space into cubic octants. Classical octrees are well suited for objects with very complex surfaces whereas other ...

    • 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)
      Comunicació de congrés
      Accés obert
      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 ...

    • From Degenerate Patches to Triangular and Trimmed Patches 

      Vigo Anglada, Marc; Pla García, Núria; Brunet Crosa, Pere (1996)
      Text en actes de congrés
      Accés restringit per política de l'editorial

    • From degenerate patches to triangular and trimmed patches 

      Vigo Anglada, Marc; Pla García, Núria; Brunet Crosa, Pere (1995-03)
      Report de recerca
      Accés obert
      CAD systems are usually based on a tensor product representation of free form surfaces. Trimmed patches provide a reasonable solution for the representation of general topologies, provided that the gap between equivalent ...

    • Generació adaptativa de contorns de nivell 

      Pérez Vidal, Lluís; Brunet Crosa, Pere (Universitat Politècnica de Barcelona. Centre de Càlcul, 1987)
      Article
      Accés obert
      The production of drawings with surface contours starts from a set of given points defined by their coordiantes. Several analytical formulations are available to define interpolation formula. In this article a variations ...

    • Generació vectorial de caràcters alfanumèrics sobre TRC (tub de raigs catòdics) 

      Amat Girbau, Josep; Brunet Crosa, Pere (Universitat Politècnica de Barcelona. Centre de Càlcul, 1978-03)
      Article
      Accés obert
      L'article presenta un mètode de traçat vectorial de caràcters alfanumèrics sobre tub de Raigs Catòdics. El fet d'haver escollit prèviament un conjunt restringit de vectors de diferents mòduls i pendents que permeten de ...

    • Hoops: 3D curves as conservative occluders for cell visibility 

      Brunet Crosa, Pere; Navazo Álvaro, Isabel; Rossignac, Jarek; Saona Vázquez, Carlos Luis (North Holland, 2001-08)
      Article
      Accés restringit per política de l'editorial
      Most visibility culling algorithms require convexity of occluders. Occluder synthesis algorithms attempt to construct large convex occluders inside bulky non-convex sets. Occluder fusion algorithms generate convex occluders ...

    • Hybrid ROI-based visualization of medical models 

      Campoalegre Vera, Lazaro; Navazo Álvaro, Isabel; Brunet Crosa, Pere (2015)
      Comunicació de congrés
      Accés obert
      There is an increasing interest on tele-medicine and tele-diagnostic solutions based on the remote inspection of volume data coming from multimodal imaging. Client-server architectures meet these functionalities. The use ...

    • Immersive data comprehension: visualizing uncertainty in measurable models 

      Brunet Crosa, Pere; Andújar Gran, Carlos Antonio (2015-09-29)
      Article
      Accés obert
      Recent advances in 3D scanning technologies have opened new possibilities in a broad range of applications including cultural heritage, medicine, civil engineering, and urban planning. Virtual Reality systems can provide ...

    • Implementació orientada a objectes del model de fronteres per a sòlids políedrics 

      Sala Valcárcel, Francisco; Brunet Crosa, Pere (1995-03)
      Report de recerca
      Accés obert
      En aquest document s'exposa el disseny d'un modelador de políedres. Aquest modelador és una de les aplicacions que s'incorpora al projecte ATLAS (TIC - 605).

    • Inexpensive reconstruction and rendering of realistic roadside landscapes 

      Andújar Gran, Carlos Antonio; Chica Calaf, Antonio; Vico Moya, Miguel Ángel; Moya Santos, Sergio; Brunet Crosa, Pere (2014-09-01)
      Article
      Accés obert
      In this paper, we present an inexpensive approach to create highly detailed reconstructions of the landscape surrounding a road. Our method is based on a space-efficient semi-procedural representation of the terrain and ...