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dc.contributor.authorTost Pardell, Daniela
dc.contributor.authorPuig Puig, Anna
dc.contributor.authorNavazo Álvaro, Isabel
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Llenguatges i Sistemes Informàtics
dc.date.accessioned2010-10-05T15:01:30Z
dc.date.available2010-10-05T15:01:30Z
dc.date.created1995-01
dc.date.issued1995-01
dc.identifier.citationTost, D.; Puig, A.; Navazo, I. A Volume Visualization Algorithm using a coherent Extended Weight Matrix. "Computers and graphics (UK)", Gener 1995, vol. 19, núm. 1, p. 37-45.
dc.identifier.issn0097-8493
dc.identifier.urihttp://hdl.handle.net/2117/9364
dc.description.abstractDirect cell-to-cell volume visualization algorithms, also called projective rendering methods, present the advantage of allowing semi-transparencies and, additionally, as they project all the samples, they avoid the voxel-space aliasing. However, they are generally computationally expensive and artifacts may appear in the projection. In this paper, different projective strategies are reviewed and compared. A new algorithm, based on a back-to-front (BTF) voxel-to-voxel traversal, is proposed. It consists of the computation, in a preprocess, of 16 Extended Generalized Weight (EGW) matrices, based on the voxel's geometry and the viewpoint direction. Taking into advantage the voxel-to-voxel coherence, the EGW are applied incrementally to each voxel as footprints to be composited with the image buffer, according to the voxel shade and opacity values. It is shown that the method avoids artifacts, and that it has a low computational cost because it does not require re-voxellization and it does not perform any geometric computation in the projection process. It is specially suitable for voxel representations and image space resolutions such that the projection of a single voxel covers more than one pixel.
dc.format.extent9 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Informàtica::Infografia
dc.subject.lcshInformation visualization
dc.subject.lcshMatrices
dc.subject.lcshRendering (Computer graphics)
dc.titleA Volume Visualization Algorithm using a coherent Extended Weight Matrix
dc.typeArticle
dc.subject.lemacVisualització
dc.subject.lemacMatrius (Matemàtica)
dc.subject.lemacRepresentació gràfica
dc.contributor.groupUniversitat Politècnica de Catalunya. MOVING - Grup de Recerca en Modelatge, Interacció i Visualització en Realitat Virtual
dc.contributor.groupUniversitat Politècnica de Catalunya. GIE - Grup d'Informàtica a l'Enginyeria
dc.identifier.doi10.1016/0097-8493(94)00120-N
dc.relation.publisherversionhttp://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TYG-3YB514H-2M-1&_cdi=5618&_user=1517299&_pii=009784939400120N&_orig=search&_coverDate=02%2F28%2F1995&_sk=999809998&view=c&wchp=dGLbVlW-zSkWz&md5=e1f232b07d719a488f8a40eeafdbc875&ie=/sdarticle.pdf
dc.rights.accessRestricted access - publisher's policy
drac.iddocument1623571
dc.description.versionPostprint (published version)
upcommons.citation.authorTost, D.; Puig, A.; Navazo, I.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameComputers and graphics (UK)
upcommons.citation.volume19
upcommons.citation.number1
upcommons.citation.startingPage37
upcommons.citation.endingPage45


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