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A Calligraphic Interface for Interactive Free-Form Modeling with Large Datasets

B. Rodrigues De Araujo, J.A.P. Jorge
2005 XVIII Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI'05)  
We present a sketching interface for modeling shapes defined by large sets of points. Our system supports powerful modeling operations that are applied directly to the points defining the surface.  ...  By combining these operations we can create complex shapes, including objects with sharp features.  ...  This allows that during expansion, we can easily change the function behavior for our polygonizer when corners are detected and adapting the edge length correctly.  ... 
doi:10.1109/sibgrapi.2005.2 dblp:conf/sibgrapi/AraujoJ05 fatcat:rmwsikjgrbchhprik53zat3fme

Surface Curvature Estimation for Edge Spinning Algorithm [chapter]

Martin Cermak, Vaclav Skala
2004 Lecture Notes in Computer Science  
This paper presents an adaptive modification of the Edge spinning method for polygonization of implicit surfaces.  ...  The method insists on the shape of triangles and the accuracy of resulting approximation as well.  ...  This algorithm produces badly-shaped triangles but it is fast and also stable for complex implicit surfaces with C 0 continuity, only. 5 shows the object modeled as intersection of two spheres.  ... 
doi:10.1007/978-3-540-24687-9_52 fatcat:itaw4cdafngxxmwfhjqf3opaoe

Animating soft substances with implicit surfaces

Mathieu Desbrun, Marie-Paule Gascuel
1995 Proceedings of the 22nd annual conference on Computer graphics and interactive techniques - SIGGRAPH '95  
The model uses a particle system coated with a smooth iso-surface that is used for performing collision detection, precise contact modeling and integration of response forces.  ...  This paper presents a hybrid model for animation of soft inelastic substance which undergo topological changes, e.g. separation and fusion and which fit with the objects they are in contact with.  ...  Acknowledgements Many thanks to Jean-Dominique Gascuel for his efficient ray-tracing software, to the reviewers for their helpful comments, and to Agata Opalach for carefully re-reading this paper.  ... 
doi:10.1145/218380.218456 dblp:conf/siggraph/DesbrunG95 fatcat:f5az5meg2jbkxk5akyjrtpb5eq

Animation of deformable models using implicit surfaces

M. Cani-Gascuel, M. Desbrun
1997 IEEE Transactions on Visualization and Computer Graphics  
Offering a compact definition of a smooth surface around an object, they provide an efficient collision detection mechanism.  ...  This paper presents a general approach for designing and animating complex deformable models with implicit surfaces.  ...  Many thanks to Agata Opalach and Jules Bloomenthal for fruitful discussions, to reviewers for very helpful comments, and to Andrew Hanson and George Drettakis for carefully rereading this paper.  ... 
doi:10.1109/2945.582343 fatcat:2krsuyaeszchfki7gotz2tlcua

Interactive techniques for implicit modeling

Jules Bloomenthal, Brian Wyvill
1990 Proceedings of the 1990 symposium on Interactive 3D graphics - SI3D '90  
Recent research has demonstrated the usefulness of implicit surfaces for modeling geometric objects.  ...  Principally this is due to the difficulty of controlling the shape of implicit surfaces while displaying the changes quickly enough for use within an interactive design environment.  ...  Acknowledgements We thank a number of individuals and organizations for their assistance.  ... 
doi:10.1145/91385.91427 dblp:conf/si3d/BloomenthalW90 fatcat:jy2abasij5g4bo7lrrm2jxyoza

Interactive techniques for implicit modeling

Jules Bloomenthal, Brian Wyvill
1990 Computer graphics  
Recent research has demonstrated the usefulness of implicit surfaces for modeling geometric objects.  ...  Principally this is due to the difficulty of controlling the shape of implicit surfaces while displaying the changes quickly enough for use within an interactive design environment.  ...  Acknowledgements We thank a number of individuals and organizations for their assistance.  ... 
doi:10.1145/91394.91427 fatcat:ew7oxzthurd5tkolgq6if4n7iq

An Improved Growing Deformable Surface Patches Model for Analysis of Medical Images

Xujian Chen, Eam Khwang Teoh
2005 IAPR International Workshop on Machine Vision Applications  
Further more, surface curvature adaptiveness is achieved in the proposed deformable model by associating the surface curvature with the size of the surface patches.  ...  With the growing framework, the proposed deformable model could achieve topology adaptive surface extraction by connecting new surface patches with active patches and automated triangulating the square  ...  Deformable models have mainly two formulations: parametric form and implicit form. The advantage of implicit deformable models is their topological adaptability of the model.  ... 
dblp:conf/mva/ChenT05 fatcat:mkqa2dxzurf3naswiq34nqbgce

Element-wise mixed implicit-explicit integration for stable dynamic simulation of deformable objects

B. Fierz, J. Spillmann, M. Harders
2011 Proceedings of the 2011 ACM SIGGRAPH/Eurographics Symposium on Computer Animation - SCA '11  
First, we detect the ill-shaped simulation elements which hinder the stable explicit integration of the element nodes as a pre-computation step.  ...  This is commonly done by employing either an explicit or an implicit integration scheme. While explicit methods are only stable for small time steps, implicit methods are unconditionally stable.  ...  Acknowledgements We want to thank the reviewers for their valuable input. This research was supported by the EU project PASSPORT FP7 ICT-2007-223894.  ... 
doi:10.1145/2019406.2019440 fatcat:kvzime5crjfc3kz7dud2grexem

Simultaneous Tracking of Multiple Objects Using Fast Level Set-Like Algorithm

Martin Maska, Pavel Matula, Michal Kozubek, Marc Herbstritt
2011 Doctoral Workshop on Mathematical and Engineering Methods in Computer Science  
A topological flexibility of implicit active contours is of great benefit, since it allows simultaneous detection of several objects without any a priori knowledge about their number and shapes.  ...  The potential of the modified algorithm is demonstrated on both synthetic and real image data.  ...  Miroslav Vařecha for providing the time-lapse series of MCF-7 cell line.  ... 
doi:10.4230/oasics.memics.2010.69 dblp:conf/memics/MaskaMK10 fatcat:o5luwlkkr5dsjcpcfzicsd32xe

Polygonisation of disjoint implicit surfaces by the adaptive edge spinning algorithm of implicit objects

Martin Cermak, Vaclav Skala
2007 International Journal of Computational Science and Engineering (IJCSE)  
This paper presents an adaptive method for polygonisation of implicit surfaces. The method is based on the shape of triangles and the accuracy of resulting approximation.  ...  Moreover, the technique for detection of more disjoint implicit surfaces in a defined area is also presented.  ...  Figure 14 Histogram of triangles shape quality Conclusion This paper presents a new adaptive approach for polygonisation of implicit surfaces.  ... 
doi:10.1504/ijcse.2007.014464 fatcat:xedt57ogxfdbpnd2b5eigj2aii

Implicit Surface Reconstruction and uniform Sampling by Striped Marching Triangles [article]

Víctor Leborán, Xose M. Pardo
2003 Eurographics State of the Art Reports  
This work presents a modified method of implicit surface polygonization based on "Marching Triangles".  ...  They define a smooth surface surrounding objects which must be polygonized for an efficient visualization.  ...  Gonzalez for useful suggestions and their advice on the paper. This research was supported by CICYT TIC 200-0399-C02-02 and Xunta de Galicia PGIDT01TIC20601PN grants.  ... 
doi:10.2312/egs.20031061 fatcat:7y6luctag5frhju63qdoue6cxa

Computer vision system for in-house video surveillance

R. Cucchiara, C. Grana, A. Prati, R. Vezzani
2005 IEE Proceedings - Vision Image and Signal Processing  
Shadows, large occlusions and deformable models of people are the key problems that must be taken into account for in-house surveillance.  ...  In this context, common problems and general purpose computer vision techniques are discussed and implemented in an integrated solution composed of a robust moving object detection module, which is able  ...  CAUSE EFFECT SOLUTION large shadows diffuse and close sources of illumination shape distortion and object merging shadow detection in the HSV colour space (Sec. 2.1) deformable object model  ... 
doi:10.1049/ip-vis:20041215 fatcat:ssafu4ypwbaebnvdzfgunta3vi

IMPLICIT SHAPE MODELS FOR OBJECT DETECTION IN 3D POINT CLOUDS

A. Velizhev, R. Shapovalov, K. Schindler
2012 ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
The method is based on the implicit shape models (ISM) framework, which recognizes objects by voting for their center locations.  ...  We present a method for automatic object localization and recognition in 3D point clouds representing outdoor urban scenes.  ...  The method is based on implicit shape models, which recognize objects by voting for their centroid locations.  ... 
doi:10.5194/isprsannals-i-3-179-2012 fatcat:uxmoxv2bprhzfl3fdjc5kyyqgi

Mesh Forging: Editing of 3D-Meshes Using Implicitly Defined Occluders [article]

G. H. Bendels, R. Klein
2003 Symposium on geometry processing : [proceedings]. Symposium on Geometry Processing  
Our method resembles and was in fact motivated by the forging process where an anvil is used to give the manipulated object the desired shape.  ...  In recent years the ease of use and the flexibility in the editing process shifted into focus in modelling and animation applications.  ...  In implicit modelling, contact situations between two surfaces S i = {p ∈ Ê | f i (p) = c}, i ∈ {1, 2} are easily detected by checking for points p satisfying both f 1 (p) ≤ c and f 2 (p) ≤ c.  ... 
doi:10.2312/sgp/sgp03/207-217 fatcat:gl3prnviozdppfjdwxgm7usivy

Expressive Illumination of Foliage Based on Implicit Surfaces [article]

Thomas Luft, Michael Balzer, Oliver Deussen
2007 Eurographics Workshop on Natural Phenomena  
This paper presents an approach for vivid representations of foliage based on implicit surfaces.  ...  It approximates the complex lighting interaction within the foliage and enables a clear illustration of its general shape and local density, thus supporting the three-dimensional depth cue of the viewer  ...  Implicit surfaces offer a powerful abstraction for representing amorphous object sets.  ... 
doi:10.2312/nph/nph07/071-078 fatcat:vw5ovi5jjrggla5vpvjhnfpqke
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