DSpace Kolekce:
http://hdl.handle.net/11025/10638
2024-03-28T23:06:14ZGeneration of Parameterized Models for Vessels Design
http://hdl.handle.net/11025/10670
Název: Generation of Parameterized Models for Vessels Design
Autoři: Diaz, Ruben G.; Dreux, Marcelo; Coelho, Luiz Cristovão G.
Editoři: Skala, Václav
Abstrakt: This work proposes an integrated environment for modeling, and static and dynamic analysis of vessels. The main advantage of
the proposed environment is that it is possible to automatically obtain variants of a specific model in order to achieve a desired
configuration, not only in relation to geometry but also concerning the static stability aspect. This environment uses the Lua
programming language and it is possible to define global variables to be used as parameters which retrieve or modify modeling
values such as length, width, height, and so on. Any model can be parameterized, as a function of user chosen variables, which
allows an automatic modeling with the variation of those parameters.2013-01-01T00:00:00ZDiaz, Ruben G.Dreux, MarceloCoelho, Luiz Cristovão G.Real-time visualization of Moebius transformations in space using Quaternionic-Bezier approach
http://hdl.handle.net/11025/10669
Název: Real-time visualization of Moebius transformations in space using Quaternionic-Bezier approach
Autoři: Karpavicius, Vytautas; Krasauskas, Rimvydas
Editoři: Skala, Václav
Abstrakt: Moebius transformations in space are much more sophisticated than the classical case on the plane, which has
been well studied. We present a WebGL approach for visualization of Moebius transformations in 3-space by
animating deformations of geometric objects composed of patches parametrized by Quaternionic-Bezier
formulas. The idea is to represent Moebius transformations in a quaternionic form as well, and to use GPU
shaders for transforming control points, weights, and normals, then seamlessly stitching patches with different
levels of detail, and computing points on every patch. Finally, we demonstrate the main classes of Moebius
transformations in space on several 3D objects including primitive shapes, Dupin cyclide patchworks, and Utah
Teapot.2013-01-01T00:00:00ZKarpavicius, VytautasKrasauskas, RimvydasSimilarity Detection for Free-Form Parametric Models
http://hdl.handle.net/11025/10668
Název: Similarity Detection for Free-Form Parametric Models
Autoři: Dang, Quoc-Viet; Mouysset, Sandrine; Morin, Géraldine
Editoři: Skala, Václav
Abstrakt: In this article, we propose a framework for detecting local similarities in free-form parametric models, in particular
on B-Splines or NURBS based B-reps: patches similar up to an approximated isometry are identified. Many recent
articles have tackled similarity detection on 3D objects, in particular on 3D meshes. The parametric B-splines, or
NURBS models are standard in the CAD (Computer Aided Design) industry, and similarity detection opens the
door to interesting applications in this domain, such as model editing, objects comparison or efficient coding. Our
contributions are twofold: we adapt the current technique called votes transformation space for parametric surfaces
and we improve the identification of isometries. First, an orientation technique independent of the parameterization
permits to identify direct versus indirect transformations. Second, the validation step is generalized to extend to
the whole B-rep. Then, by classifying the isometries according to their fixed points, we simplify the clustering
step. We also apply an unsupervised spectral clustering method which improves the results but also automatically
estimates the number of clusters.2013-01-01T00:00:00ZDang, Quoc-VietMouysset, SandrineMorin, GéraldineImproved Interactive Reshaping of Humans in Images
http://hdl.handle.net/11025/10667
Název: Improved Interactive Reshaping of Humans in Images
Autoři: Nidhi, Arora; Kumar, Harsh; Dhaliwal, Jagjeet S.; Kalra, Prem; Chaudhuri, Parag
Editoři: Skala, Václav
Abstrakt: In this paper, we present an interactive and flexible approach for realistic reshaping of human bodies in a single
image. For reshaping, a user specifies a set of semantic attributes like weight and height. Then we use a 3Dmorphable
model based image retouching technique for global reshaping of the human bodies in the image such
that they satisfy the semantic constraints specified by the user. We address the problem of deformation of the
environment surrounding the human body being reshaped, which produces visible artifacts, especially noticeable
at regions with structural features, in prior work. We are able to separate the human figure from the background.
This allows us to reshape the figure, while preserving the background. Missing regions in the background are
inpainted in a manner that maintains structural details. We also provide a quantitative measure for distortion and
compare our results with the prior work.2013-01-01T00:00:00ZNidhi, AroraKumar, HarshDhaliwal, Jagjeet S.Kalra, PremChaudhuri, Parag