Exploració per autor "Ayala Vallespí, M. Dolors"
Ara es mostren els items 16-35 de 53
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Efficient algorithms for boundary extraction of 2D and 3D orthogonal pseudomanifolds
Vigo Anglada, Marc; Pla García, Núria; Ayala Vallespí, M. Dolors; Martínez Bayona, Jonàs (2011)
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Accés obertIn this paper we present algorithms to extract the boundary representation of orthogonal polygons and polyhedra, either manifold or pseudomanifold. The algorithms we develop reconstruct not only the polygons of the boundaries ... -
Efficient algorithms for boundary extraction of 2D and 3D orthogonal pseudomanifolds
Vigo Anglada, Marc; Pla García, Núria; Ayala Vallespí, M. Dolors; Martínez Bayona, Jonás (2012)
Article
Accés restringit per política de l'editorialIn this paper we present algorithms to extract the boundary representation of orthogonal polygons and polyhedra, either manifold or pseudomanifold. The algorithms we develop reconstruct not only the polygons of the boundaries ... -
Efficient computation of 3D skeletons by extreme vertex encoding
Rodríguez Rojas, Jorge Ernesto; Thomas, Federico; Ayala Vallespí, M. Dolors; Ros Giralt, Lluís (2003)
Article
Accés obertMany skeletonisation algorithms for discrete volumes have been proposed. Despite its simplicity, the one given here still has many theoretically favorable properties. Actually, it provides a connected surface skeleton that ... -
Fast connected component labeling algorithm: a non voxel-based approach
Ayala Vallespí, M. Dolors; Rodríguez, J; Aguilera, A (2002-03)
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Accés obertThis paper presents a new approach to achieve connected component labeling on both binary images and volumes by using the Extreme Vertices Model (EVM), a representation model for orthogonal polyhedra, applied to digital ... -
Fast neighborhood operations for images and volume datasets
Rodríguez Rojas, Jorge Ernesto; Ayala Vallespí, M. Dolors (2003-02)
Report de recerca
Accés obertThis paper presents a new approach to carry out erosion, dilation and connected component labeling. We use the Extreme Vertices Model (EVM), an orthogonal polyhedra representation, to describe binary images and ... -
Faster ASV decomposition for orthogonal polyhedra using the Extreme Vertices Model (EVM)
Aguilera Ramírez, Fernando Antonio; Ayala Vallespí, M. Dolors (2000-01)
Report de recerca
Accés obertThe alternating sum of volumes (ASV) decomposition is a widely used technique for converting a B-Rep into a CSG model. The obtained CSG tree has convex primitives at its leaf nodes, while the contents of its internal ... -
Improved plane-sweep based algorithm for boundary extraction of 3D images
Ayala Vallespí, M. Dolors; Vergara, Enric (2005-09)
Report de recerca
Accés obertThere exist several approaches to extract the boundary of a 3D image. Most of them represent the extracted boundary as a collection of a large number of little triangular or quadrangular faces whereas few approaches ... -
Improved skeleton computation of extreme vertices encoded volume
Ayala Vallespí, M. Dolors; Rodríguez, J.; Thomas, F.; Vergara, E. (2006-06)
Report de recerca
Accés obertMany skeletonisation algorithms for discrete volumes have been proposed. The one given here can be fully implemented in terms of regularized boolean differences, unions and intersections of volumes, without relying on large ... -
Improved virtual porosimeter
Vergés Garcia, Eduard; Ayala Vallespí, M. Dolors (2008)
Text en actes de congrés
Accés restringit per política de l'editorialRecently, the term BioCAD has appeared to refer to the modeling of biological processes. This work focuses on the analysis of structural properties such as porosity of bioimplants for bone reconstruction. Specifically, ... -
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)
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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 ...