Now showing items 21-40 of 88

  • Data-aware picking for medical models 

    Monclús Lahoya, Eva; Vázquez Alcocer, Pere Pau; Navazo Álvaro, Isabel (Springer, 2014)
    Part of book or chapter of book
    Open Access
    Medical doctors are often faced with the problem of selecting anchoring points in 3D space. These points are commonly used for measurement tasks, such as lengths of bones, or dimensions of pathological structures (e. g. ...
  • Data-aware picking for medical models 

    Monclús Lahoya, Eva; Vázquez Alcocer, Pere Pau; Navazo Álvaro, Isabel (Springer, 2014-09-30)
    Part of book or chapter of book
    Open Access
    Medical doctors are often faced with the problem of selecting anchoring points in 3D space. These points are commonly used for measurement tasks, such as lengths of bones, or dimensions of pathological structures (e.g. ...
  • Data-driven tetrahedral mesh subdivision 

    Rodríguez Pérez, Lyudmila Odalina; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2006-09)
    External research report
    Open Access
    Given a tetrahedral mesh immersed in a voxel model, we present a method to refine the mesh to reduce the discrepancy between interpolated values based on either scheme at arbitrary locations. An advantage of the method ...
  • Data-driven tetrahedral mesh subdivision 

    Rodríguez Pérez, Lyudmila Odalina; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (North Holland, 2007-12)
    Article
    Restricted access - publisher's policy
    Given a tetrahedral mesh immersed in a voxel model, we present a method to refine the mesh to reduce the discrepancy between interpolated values based on either scheme at arbitrary locations. An advantage of the method ...
  • Data structures and algorithms for navigation in highly polygon-populated scenes 

    Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel; Brunet Crosa, Pere (1998-10)
    External research report
    Open Access
    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 ...
  • Discrete medial axis transform for discrete thin and elongated objects 

    Puig Puig, Anna; Tost Pardell, Daniela; Navazo Álvaro, Isabel (1999-12)
    External research report
    Open Access
    Skeletons are compact shape descriptions of discrete images. They have been extensively studied because of their utility in various applications such as data compression, shape abstraction, navigation and features detection. ...
  • Disseny d'un arbre octree genèric 

    Navazo Álvaro, Isabel; Francesc, Sala; Sala Valcárcel, Francisco (1997-01)
    External research report
    Open Access
    The adequated representation of three dimensional objects and/or scenes in the computer is of great importance in computer graphics applications. One of such representations is the octree scheme. Octree scheme is ...
  • Disseny d'un octree extés 

    Monclús Lahoya, Eva; Navazo Álvaro, Isabel (1997-09)
    External research report
    Open Access
    The Extended Octree is a generalization of classical Octree, based on the inclusion of four new node types (Face, Edge, Vertex and QuasiVertex). These new terminal nodes contain a piece of the boundary of the object ...
  • 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)
    Conference report
    Open Access
    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)
    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 ...
  • Enabling collaboration in virtual reality navigators 

    Theoktisto Colmenares, Victor Arturo; Fairén González, Marta; Navazo Álvaro, Isabel (2004-03)
    External research report
    Open Access
    In this paper we characterize a feature superset for Collaborative Virtual Reality Environments (CVRE), and derive a component framework to transform stand-alone VR navigators into full-fledged multithreaded ...
  • Enhanced magnification for reduced movement in virtual reality environments 

    Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (IADIS Press, 2016)
    Conference report
    Restricted access - publisher's policy
    Although Virtual Reality (VR) environments have seen slower adoption rates than expected among the medical community, throughout the last years, several new techniques and devices (e.g. Oculus Rift) have been developed ...
  • Estado del arte de la alineación de imágenes médicas e implementación del algoritmo de alineación clásico basado en la información mutua 

    Murillo Pavas, Santiago; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2005-05)
    External research report
    Open Access
    La alineación de imágenes cardíacas procedentes de imágenes de medicina nuclear tal como la Tomografía Computerizada por Emisión Única de Positrones (SPECT) constituye un campo de investigación activo dada su importancia ...
  • 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 ...
  • Geometric transformations in octrees using shears 

    Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (1997-12)
    External research report
    Open Access
    Existent algorithms to perform geometric transformations on octrees can be classified in two families: inverse transformation and address computation ones. Those in the inverse transformation family essentially resample ...
  • 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
    Restricted access - publisher's policy
    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 model for vascular tree structures 

    Puig Puig, Anna; Tost Pardell, Daniela; Navazo Álvaro, Isabel (1999-12)
    External research report
    Open Access
    This paper proposes a new representation scheme of the cerebral blood vessels. This model provides information on the semantics of the vascular structure: the topological relationships between vessels and the ...
  • Hybrid ROI-based visualization of medical models 

    Campoalegre Vera, Lazaro; Navazo Álvaro, Isabel; Brunet Crosa, Pere (2015)
    Conference lecture
    Open Access
    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 ...
  • 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 ...
  • Integrating occlusion culling and levels of detail through hardly-visible sets 

    Andújar Gran, Carlos Antonio; Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel; Brunet Crosa, Pere (North Holland, 2000-12)
    Article
    Restricted access - publisher's policy
    Occlusion culling and level-of-detail rendering have become two powerful tools for accelerating the handling of very large models in real-time visualization applications. We present a framework that combines both techniques ...