Exploració per autor "Ayala Vallespí, M. Dolors"
Ara es mostren els items 25-44 de 53
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MDCO to B-Rep conversion algorithm
Ayala Vallespí, M. Dolors; Andújar Gran, Carlos Antonio; Brunet Crosa, Pere (1995-07)
Report de recerca
Accés obertSpatial enumeration models are widely used in several fields. These models are approximate but the major disadvantage is the lack of concision. In order to avoid such verbosity, hierarchical encodings such as octrees have ... -
Merging faces: A new orthogonal simplification of solid models
Cruz Matías, Irving Alberto; Ayala Vallespí, M. Dolors (Springer, 2013)
Text en actes de congrés
Accés restringit per política de l'editorialA new approach to simplify orthogonal pseudo-polyhedra (OPP) and binary volumes is presented. The method is incremental and produces a level-of-detail (LOD) sequence of OPP. Any object of this sequence contains the ... -
Modelat sòlid: realització d'operacions booleanes amb model de fronteres
Ayala Vallespí, M. Dolors (1989)
Report de recerca
Accés obertAquest treball presenta un algorisme per realitzar operacions booleanes amb model de fronteres. Es basa en un algorisme en 2D per polígons. L'algorisme consta de 4 passos. Els tres primers son comuns a qualsevol operació ... -
Multiresolution approximation of polyhedral solids
Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Joan Arinyo, Robert; Navazo Álvaro, Isabel (1996-06)
Report de recerca
Accés obertMultiresolution models with different levels of detail are a basic tool for handling very large and complex systems in computer aided design applications such as ship design. In this work, we discuss several automatic ... -
Object representation by means of nonminimal division quadtrees and octrees
Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Juan, R.; Navazo Álvaro, Isabel (1985-01)
Article
Accés restringit per política de l'editorialQuadtree representation of two-dimensional objects is performed with a tree that describes the recursive subdivision of the more complex parts of a picture until the desired resolution is reached. At the end, all the leaves ... -
Octree simplification of polyhedral solids
Ayala Vallespí, M. Dolors; Brunet Crosa, Pere (1995-02)
Report de recerca
Accés obertMultiresolution representations are becoming more and more important for the visualization, operation and interrogation of very complex scenes. In this paper, an automatic simplification algorithm for general two-manifold ... -
Orientation, sphericity and roundness evaluation of particles using alternative 3D representations
Cruz Matías, Irving; Ayala Vallespí, M. Dolors (2014)
Report de recerca
Accés obertSphericity and roundness indices have been used mainly in geology to analyze the shape of particles. In this paper, geometric methods are proposed as an alternative to evaluate the orientation, sphericity and roundness ... -
Orthogonal polyhedra as geometric bounds in constructive solid geometry
Aguilera, A; Ayala Vallespí, M. Dolors (1996-12)
Report de recerca
Accés obertSet membership classification and, specifically, the evaluation of a CSG tree are problems of a certain complexity. Several techniques to speed up these processes have been proposed such as Active Zones, Geometric ... -
Plataforma de desenvolupament de pràctiques de gràfics
Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Esteve Cusiné, Jordi; Joan Arinyo, Robert; Pérez Vidal, Lluís; Puig Puig, Anna; Solano Albajés, Lluís; Tost Pardell, Daniela; Vigo Anglada, Marc; Vilaplana Pastó, Josep (1999-06)
Report de recerca
Accés obert -
Quantitative analysis of the resorption and osteoconduction of a macroporous calcium phosphate bone cement for the repair of a critical size defect in the femoral condyle
Miño Fariña, Natalia; Muñoz Guzón, Fernando; López Peña, Mónica; Ginebra Molins, Maria Pau; Valle Fresno, Sergio del; Ayala Vallespí, M. Dolors; González Cantalapiedra, Antonio (Elsevier, 2009-02)
Article
Accés restringit per política de l'editorialClinical orthopaedic use of calcium phosphate cement has been limited due to its slow resorption rate, but a new macroporous a-tricalcium phosphate (a-TCP) bone cement has been designed to accelerate resorption and to ... -
Representation and boundary extraction of a 3D digital image using the EVM model
Ayala Vallespí, M. Dolors; Aguilera Ramírez, Fernando Antonio; Rodríguez Rojas, Jorge Ernesto (2000-11)
Report de recerca
Accés obertIn recent published papers we have presented the Extreme Vertices Model (EVM), a concise and complete model for representing orthogonal polyhedra. This model exploits the simplicity of its domain by allowing robust and ... -
Robust topology simplification
Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Ayala Vallespí, M. Dolors (2000-05)
Report de recerca
Accés obertThis 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 ... -
Skeleton computation of an image using a geometric approach
Martínez Bayona, Jonàs; Vigo Anglada, Marc; Pla García, Núria; Ayala Vallespí, M. Dolors (2010-03)
Report de recerca
Accés obertIn this work we develop two algorithms to compute the skeleton of a binary 2D images. Both algorithms follow a geometric approach and work directly with the boundary of the image wich is an orthogonal polygon (OP). One of ... -
Skeleton computation of an image using a geometric approach
Martínez Bayona, Jonás; Vigo Anglada, Marc; Pla García, Núria; Ayala Vallespí, M. Dolors (2010)
Comunicació de congrés
Accés restringit per política de l'editorialIn this work we develop two algorithms to compute the skeleton of a binary 2D image. Both algorithms follow a geometric approach and work directly with the boundary of the image which is an orthogonal polygon (OP). One ... -
Skeletonless porosimeter simulation
Rodríguez, Jorge; Cruz Matías, Irving; Vergés Garcia, Eduard; Ayala Vallespí, M. Dolors (2010)
Report de recerca
Accés obertWe introduce a new approach to simulate a virtual mercury intrusion porosimetry (MIP) using neither skeleton computing nor seed-growing methods. Most of the existing methods to determine local pore sizes in a porous medium ... -
Solving point and plane vs. orthogonal polyhedra using the extreme vertices model (EVM)
Aguilera, Antonio; Ayala Vallespí, M. Dolors (1997-12)
Report de recerca
Accés obertIn a previous work, Orthogonal Polyhedra (OP) were proposed as geometric bounds in CSG. Primitives in the CSG model were approximated by their respective bounding boxes. The polyhedrical bound for the CSG object was ... -
Sphericity and roundness computation for particles using the extreme vertices model
Cruz Matías, Irving; Ayala Vallespí, M. Dolors; Hiller, Daniel; Gutsch, Sebastian; Zacharias, Margit; Estradé, Sònia; Peiró Martínez, Francesca (Elsevier, 2019-01-01)
Article
Accés obertShape is a property studied for many kinds of particles. Among shape parameters, sphericity and roundness indices had been largely studied to understand several processes. Some of these indices are based on length measurements ... -
Splat representation of parametric surfaces
Ayala Vallespí, M. Dolors; Pla García, Núria; Vigo Anglada, Marc (2005-09)
Report de recerca
Accés obertPoint-based geometry representations and their splat-based generalizations have become a suitable technique both for modeling and rendering complex 3D shapes. So, it seems interesting to convert other kind of models to ... -
Structural parameters
Ayala Vallespí, M. Dolors; Vergés, Eduard (2010-02)
Report de recerca
Accés obertThe development of the bioengineering field has yield to the apparition of a new application of the Computer-Aided-Design, Bio-CAD, aiming to the use of computer models to represent biological samples and methods to simulate ... -
Study of bone implants based on 3D images
Grau, S.; Ayala Vallespí, M. Dolors; Tost Pardell, Daniela; Miño, N.; Muñoz, F.; González, A. (2005-09)
Report de recerca
Accés obertNew medical input technologies together with computer graphics modelling and visualization software have opened a new track for biomedical sciences: the so-called in-silice experimentation, in which analysis ...