The 12-th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision'2004, WSCG 2004, University of West Bohemia, Campus Bory, Plzen-Bory, Czech Republic, February 2-6, 2004

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  Online Proceedings

Keynote talks

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  Tosiyasu L. Kunii: Cyber Graphics.
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  Carol O'Sullivan: Fidelity Metrics for Animation. 1-6
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  Penny Rheingans: Expressive Volume Rendering. 7-10

Full papers

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  Jukka Arvo, Jan Westerholm: Hardware Accelerated Soft Shadows using Penumbra Quads. 11-18
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  Barnabás Aszódi, Szabolcs Czuczor, László Szirmay-Kalos: NURBS Fairing by Knot Vector Optimization. 19-26
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  Ákos Balázs, Michael Guthe, Reinhard Klein: Efficient Trimmed NURBS Tessellation. 27-34
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  Aurélien Barbier, Eric Galin, Samir Akkouche: Complex Skeletal Implicit Surfaces with Levels of Detail. 35-42
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  Uwe Berner: Optimized Face Animation with Morph-Targets. 43-48
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  Sushil Bhakar, Liang Luo, Sudhir P. Mudur: View Dependent Stochastic Sampling for Efficient Rendering of Point Sampled Surfaces. 49-56
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  Hermann Birkholz: Shape-Preserving Parametrization of Genus 0 Surfaces. 57-64
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  Vittoria Bruni, Domenico Vitulano: Old Movies Noise Reduction via Wavelets and Wiener Filters. 65-72
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  Vittoria Bruni, Domenico Vitulano, Umberto Maniscalco: Fast Segmentation and Modeling of Range Data Via Steerable Pyramid and Superquadrics. 73-80
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  Chiara Eva Catalano, Franca Giannini, Bianca Falcidieno: Introducing Sweep Features in Modeling with Subdivision Surfaces. 81-88
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  Rodolphe Crespin, Bernard Péroche: Light Vectors for a Moving Observer. 89-96
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  Farag I. Y. Elnagahy, Boris Simák: Embedded Rate Scalable Wavelet-Based Image Coding Algorithm with RPSWS. 97-104
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  Maria Ferre, Anna Puig, Dani Tost: Using a Classification Tree to Speed up Rendering of Hybrid Surface and Volumes Models. 105-112
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  Mauricio Galo, Clesio L. Tozzi: Feature-point Based Matching: A Sequential Approach Based on Relaxation Labeling and Relative Orientation. 113-120
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  Inmaculada García, Ramón Mollá Vayá, Toni Barella: GDESK: Game Discrete Event Simulation Kernel. 121-128
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  Marco Gillies, Daniel Ballin, Balázs Csanád Csáji: Efficient Clothing Fitting from Data. 129-136
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  Michael Hauth, Wolfgang Straßer: Corotational Simulation of Deformable Solids. 137-144
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  Bruno Heidelberger, Matthias Teschner, Markus H. Gross: Detection of Collisions and Self-collisions Using Image-space Techniques. 145-152
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  Martin Held, Werner Weiser, Franz Wilhelmstötter: Fully Automatic Elastic Registration of MR Images with Statistical Feature Extraction. 153-160
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  Benjamin Hohnhäuser, Günter Hommel: 3D Pose Estimation using Coupled Snakes. 161-166
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  Muhammad Hussain, Yoshihiro Okada, Koichi Niijima: Efficient and Feature-Preserving Triangular Mesh Decimation. 167-174
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  Chun-Yen Chen, Kuo-Young Cheng, Hong-Yuan Mark Liao: Fairing of Polygon Meshes Via Bayesian Discriminant Analysis. 175-182
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  Zur Izhakian: New Visualization of Surfaces in Parallel Coordinates - Eliminating Ambiguity and Some Over-Plotting. 183-190
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  Juan José Jiménez, Rafael Jesús Segura, Francisco R. Feito: Efficient Collision Detection between 2D Polygons. 191-198
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  Mark W. Jones: Distance Field Compression. 199-204
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  Michael Keckeisen, Stefan Kimmerle, Bernhard Thomaszewski, Markus Wacker: Modelling Effects of Wind Fields in Cloth Animation. 205-212
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  Daniel A. Keim, Christian Panse, Jörn Schneidewind, Mike Sips: Geo-Spatial Data Viewer: From Familiar Land-covering to Arbitrary Distorted Geo-Spatial Quadtree Maps. 213-220
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  Florian Kirsch, Jürgen Döllner: Rendering Techniques for Hardware-Accelerated Image-Based CSG. 221-228
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  Michael Knapp, Armin Kanitsar, Eduard Gröller: Semi-Automatic Topology Independent Contour-Based 2 1/2 D Segmentation Using Live-Wire. 229-236
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  Fabrizio Lamberti, Andrea Gamba, Bartolomeo Montrucchio: Computer-assisted Analysis of in-vitro Vasculogenesis and Angiogenesis Processes. 237-244
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  Guillaume Lavoué, Florent Dupont, Atilla Baskurt: Constant Curvature Region Decomposition of 3D-Mesh by a Mixed Approach Vertex-Triangle. 245-252
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  Tim Lewis, Mark W. Jones: A System for the Non-Linear Modelling of Deformable Procedural Shapes. 253-260
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  Yang Liu, George Chen, Nelson Max, Christian Hofsetz, Peter McGuinness: Visual Hull Rendering with Multi-view Stereo Refinement. 261-268
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  Jörn Loviscach: Emulating an Offline Renderer by 3D Graphics Hardware. 269-276
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  Nelson Max, Greg Schussman, Ryo Miyazaki, Kei Iwasaki, Tomoyuki Nishita: Diffusion and Multiple Anisotropic Scattering for Global Illumination in Clouds. 277-284
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  Toshihiko Misu, Seiichi Gohshi, Yoshinori Izumi, Yoshihiro Fujita, Masahide Naemura: Robust Tracking of Athletes Using Multiple Features of Multiple Views. 285-292
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  Marielle Mokhtari, François Lemieux, François Bernier, Denis Ouellet, Richard Drouin, Denis Laurendeau, Alexandra Branzan Albu: Virtual Environment and Sensori-Motor Activities: Visualization. 293-300
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  Zoltán Nagy, Reinhard Klein: High-Quality Silhouette Illustration for Texture-Based Volume Rendering. 301-308
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  Michael Bang Nielsen, Anders Brodersen: Inverse Rendering of Polished Materials under Constant Complex Uncontrolled Illumination. 309-316
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  Paul Noble, Wen Tang, Alex Parkinson, Ciaran Wills: Modelling and Animating 3D Cartoon Hair. 317-324
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  Ying-Han Pang, Andrew Teoh Beng Jin, David Ngo Chek Ling, Fu San Hiew: Palmprint Verification with Moments. 325-332
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  Chuchart Pintavirooj, Adisak Romputtal, Akkapob Ngamlamiad, Withawat Withayachumnankul, Kazuhiko Hamamoto: Ultrasonic Refractive Index Tomography. 333-340
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  Parichart Putjarupong, Chuchart Pintavirooj, Withawat Withayachumnankul, Manas Sangworasil: Image Registration Exploiting Five-Point Coplanar Perspective Invariant and Maximum-Curvature Point. 341-348
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  J. Francisco Ramos, Miguel Chover, Oscar Belmonte, Cristina Rebollo: An Approach to Improve Strip-based Multiresolution Schemes. 349-354
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  Bernhard Reitinger, Christopher Zach, Alexander Bornik, Reinhard Beichel: User-Centric Transfer Function Specification in Augmented Reality. 355-362
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  Patrick Reuter, Benjamin Schmitt, Christophe Schlick, Alexander A. Pasko: Interactive Solid Texturing using Point-based Multiresolution Representations. 363-370
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  Alan Robinson, Lyuba Alboul, Marcos A. Rodrigues: Methods for Indexing Stripes in Uncoded Structured Light Scanning Systems. 371-378
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  Timo Ropinski, Klaus Hinrichs: Real-Time Rendering of 3D Magic Lenses having arbitrary convex Shapes. 379-386
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  Jörg Sahm, Ingo Soetebier: A Client-Server-Scenegraph for the Visualization of Large and Dynamic 3D Scenes. 387-394
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  Elena Sánchez-Nielsen, Luis Antón-Canalís, Mario Hernández-Tejera: Hand Gesture Recognition for Human-Machine Interaction. 395-402
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  Rafael Jesús Segura, Francisco R. Feito, Juan Ruiz de Miras: Non-evaluated Manipulation of Complex CSG Solids. 403-410
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  Bernd Schwald, Helmut Seibert: Registration Tasks for a Hybrid Tracking System for Medical Augmented Reality. 411-418
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  Salvatore Spinello, Pascal Guitton: Contour Line Recognition From Scanned Topographic Maps. 419-426
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  Sara L. Su, Chenyu Wu, Ying-Qing Xu, Heung-Yeung Shum: A Hybrid Approach to Rendering Handwritten Characters. 427-434
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  László Szécsi, László Szirmay-Kalos: Efficient Approximate Visibility Testing Using Occluding Spheres. 435-442
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  Gabor Szijártó, József Koloszár: Real-time Hardware Accelerated Rendering of Forests at Human Scale. 443-450
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  László Szirmay-Kalos, Bálazs Benedek, Mateu Sbert: Metropolis Iteration for Global Illumination. 451-458
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  Bernard Tiddeman: Blending Textured Images Using a Non-parametric Multiscale MRF Method. 459-466
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  Ireneusz Tobor, Patrick Reuter, Christophe Schlick: Efficient Reconstruction of Large Scattered Geometric Datasets using the Partition of Unity and Radial Basis Functions. 467-474
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  Oliver Matias van Kaick, Murilo Vicente Gonçalves da Silva, Hélio Pedrini: Efficient Generation of Triangle Strips from Triangulated Meshes. 475-482
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  Joris S. M. Vergeest, Yu Song, D. Hartge: Freeform Object Positioning by 3D Shape Matching Without Artificial Feature Points. 483-490
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  Chensheng Wang, Joris S. M. Vergeest, Yu Song: Frequency-based Operators for Freeform Feature Shape Reuse. 491-498
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  Jianfeng Yin, Jeremy R. Cooperstock: Color Correction Methods with Application to Digital Projection Environments. 499-506
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  Javier Lluch, Emilio Camahort, Roberto Vivó: An Image-Based Multiresolution Model for Interactive Foliage Rendering. 507-514
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  Zhigeng Pan, Zhaohua Dong, Mingmin Zhang: A New Algorithm for Adding Color to Video or Animation Clips. 515-520
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  Roland Wahl, Manuel Massing, Patrick Degener, Michael Guthe, Reinhard Klein: Scalable Compression and Rendering of Textured Terrain Data. 521-528
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  Albert Akhriev, Alexander Bonch-Osmolovsky, Alexander Prusakov, Fedor Chelnokov, Pavel Agapov: Objects and Occlusion from Motion Labeling. 529-536
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  Ivo Ihrke, Lars Ahrenberg, Marcus A. Magnor: External Camera Calibration for Synchronized Multi-video Systems. 537-544
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  Xianjie Qiu, Zhaoqi Wang, Shihong Xia: A Novel Computer Vision Technique Used On Sport Video. 545-553

Short Communication Papers proceedings

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  Antonio Aguilera, Ricardo Pérez-Aguila: General n-Dimensional Rotations. 1-8
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  Bedrich Benes, J. M. Soto Guerrero: Clustering in Virtual Plant Ecosystems. 9-16
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  Bedrich Benes, Toney Roa: Simulating Desert Scenery. 17-22
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  Sanjiv K. Bhatia: Creating Large Isotropic Textures Using Image Quilting. 23-30
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  Fernando Pedro Birra, Manuel Próspero dos Santos: Stable Cloth Animation with Adaptive Level of Detail. 31-38
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  Iwona Dudek, Jean-Yves Blaise, A. Durand, P. Bénistant: Online 2D/3D Graphic Interfaces using XML "Repurposable" Heritage Contents. 39-46
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  Vania V. Estrela, Luís A. Rivera, Marcos H. S. Bassani: Pel-Recursive Motion Estimation Using the Expectation-Maximization Technique and Spatial Adaptation. 47-54
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  Jan Fischer, Ángel del Río: A Fast Method for Applying Rigid Transformations to Volume Data. 55-62
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  Marta Franquesa-Niubó, Pere Brunet: Collision Prediction Using MKtrees. 63-70
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  Thomas Fuchs, Jörg Haber, Hans-Peter Seidel: MIMIC - A Language for Specifying Facial Animations. 71-78
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  Jean-Christophe Gonzato, Bernard Pont: A Phenomenological Representation of Iridescent Colors in Butterfly Wings. 79-86
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  Eric Guilbert, Eric Saux, Marc Daniel: Combining Geometrical and Mechanical Displacements for Suppressing Intersections in Cartographic Generalization. 87-94
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  Anders Hast, Tony Barrera, Ewert Bengtsson: Fast Intensity Distribution Functions for Soft and Hard Edged Spotlights. 95-100
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  Chih-I. Hung, Po-Lei Lee, Yu-Te Wu, Hui-Yun Chen, Li-Fen Chen, Tzu-Chen Yeh, Jen-Chuen Hsieh: Recognition of Motor Imagery Electroencephalography Using Independent Component Analysis and Machine Classifiers. 101-108
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  Vincent Cheutet, Jean-Philippe Pernot, Jean-Claude Léon, Bianca Falcidieno, Franca Giannini: Inserting G1 Discontinuities into Free-form Features for Aesthetic Design. 109-116
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  Petr Kadlec, Marek Gayer, Pavel Slavík: Data Visualization Using Hardware Accelerated Spline Interpolation. 117-124
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  V. P. Kong, B. H. Ong, K. H. Saw: Range Restricted Interpolation Using Cubic Bezier Triangles. 125-132
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  Robert Kosara, Gerald N. Sahling, Helwig Hauser: Linking Scientific and Information Visualization with Interactive 3D Scatterplots. 133-140
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  Przemyslaw Kozankiewicz: Visualisation System Based on Image Warping and Delaunay Triangulation of the Space. 141-148
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  Georgy Kukharev, Pawel Masicz, Piotr Masicz: A Fast and Accurate Faces Localization using Gradient Method. 149-156
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  Georgy Kukharev, Adam Nowosielski: Visitor Identification - Elaborating Real Time Face Recognition System. 157-164
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  Cornelius Malerczyk: Interactive Museum Exhibit Using Pointing Gesture Recognition. 165-172
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  Paula N. Mallón, Montserrat Bóo, Margarita Amor, Javier D. Bruguera: Algorithms and Hardware for Data Compression in Point Rendering Applications. 173-180
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  Joachim Diepstraten, Daniel Weiskopf, Martin Kraus, Thomas Ertl: Vragments and Raxels - Relocatability as an Extension to Programmable Rasterization Hardware. 181-188
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  Djamel Merad, Malik Mallem, Sylvie Lelandais: Skeletonization of Two-Dimensional Regions Using Mixed Method. 189-196
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  Marielle Mokhtari, Robert Bergevin: Extraction of Volumetric Structures in an Illuminance Image. 197-204
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  Danny Pearce, Andy M. Day: Partial Visibility for Virual Reality Applications. 205-218
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  Luís A. Rivera, Vania V. Estrela, Paulo C. P. Carvalho: Oriented Bounding Boxes Using Multiresolution Contours for Fast Interference Detection of Arbitrary Geometric Objects. 219-212
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  Roland Perko, Horst Bischof: Efficient Implementation of Higher Order Image Interpolation. 213-226
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  Antonio J. Rueda Ruiz, Rafael Jesús Segura, Francisco R. Feito, Juan Ruiz de Miras, Carlos J. Ogáyar: Voxelization of Solids Using Simplicial Coverings. 227-234
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  Héctor Sánchez Santamaría, Aitor Moreno, David Oyarzun, Alex García-Alonso: Evaluation of NURBS Surfaces: An Overview Based on Runtime Efficiency. 235-242
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  Yu Song, Joris S. M. Vergeest, Chensheng Wang: Automatic Fitting and Control of Complex Freeform Shapes in 3-D. 243-250
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  Francesca Taponecco: User-defined Texture Synthesis. 251-258
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  Daniel Weiskopf, Thomas Ertl: GPU-Based 3D Texture Advection for the Visualization of Unsteady Flow Fields. 259-266
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  Yu-Te Wu, Hui-Yun Chen, Chih-I. Hung, Yi-Hsuan Kao, Wan-Yuo Guo, Tzu-Chen Yeh, Jen-Chuen Hsieh: Segmentation of Hemodynamics from Dynamic-Susceptibility-Contrast Magnetic Resonance Brain Images Using Sequential Independent Component Analysis. 267-274
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  Christopher Zach, Konrad F. Karner, Horst Bischof: Hierarchical Disparity Estimation with Programmable Graphics Hardware. 275-282
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  Antonio C. Zimmermann, L. S. Encinas, Jorge Muniz Barreto, Armando A. Gonçalves: Non Conventional 3D Human Face Verification System. 283-288
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  Ting-Chieh Lin, Zen-Chung Shih, Yu-Ting Tsai: Cinematic Camera Control in 3D Computer Games. 289-296
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  Q. Li: Blend Implicit Shapes using Smooth Unit Step Functions. 297-304
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  Jianfeng Yin, Jeremy R. Cooperstock: Improving Depth Maps by Nonlinear Diffusion. 305-311

Poster proceedings

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  Nicoletta Adamo-Villani, Amit Chourasia, Clark A. Cory: Production Interface for WEB-deliverable Realistic Interactive 3D Facial Animation. 1-4
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  Giancarlo Amati, Alfredo Liverani, Gianni Caligiana: Free Form Modelling by Curve Features Manipulation. 5-8
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  Muhammed Rafiq Asim, Ghulam Mustafa, Ken Brodlie: Constrained Visualization of 2D Positive Data using Modified Quadratic Shepard Method. 9-12
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  Luísa Ferreira Bastos, João Manuel R. S. Tavares: Objects Matching Improvement Using Optimization Techniques in a Geometric Modal Methodology. 13-16
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  Joachim Bauer, Konrad F. Karner, Andreas Klaus, Roland Perko: Robust Range Image Registration using a Common Plane. 17-20
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  Paul Benölken, Holger Graf, André Stork: Texture Based Flow Visualization in Augmented and Virtual Reality Environments. 21-24
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  François Bernier, Eric Boivin, Denis Laurendeau, Marielle Mokhtari, François Lemieux: Conceptual Models for Describing Virtual Worlds. 25-28
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  Norbert Braun, Thomas Rieger, M. Dietz: V-NaSty: Virtual Character Narrator with Story based Suspense Support. 29-32
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  Jose Maria Buades Rubio, Manuel González Hidalgo, Francisco J. Perales López: Face and Hands Segmentation in Color Images and Initial Matching with a Biomechanical Model. 33-36
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  Martin Cadík, Pavel Slavík: Comparing Image Processing Operators by Means of the Visible Differences Predictor. 37-40
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  Gabriel de Dietrich, Achille J.-P. Braquelaire: A Framework for Tubular Organs Segmentation. 41-44
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  Ángel del Río, Margarita Amor, Montserrat Bóo, J. M. Pardo: Visualization of Anatomical Structures Based on Implicit Surfaces and Displacement Mapping. 45-48
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  Jean-Philippe Farrugia, Stéphane Albin, Bernard Péroche: A Perceptual Adaptive Metric for Computer Graphics. 49-52
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  Reza Hasanzadeh Pak Rezaie, Karim Faez, Samira Aslanzadeh: Feature Extraction of Scale Pattern in Animal Textile Fibers. 53-56
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  Benjamín Hernández, Isaac Rudomín: Styling by Painting and Real Time Animation of Hair using Basis-dependent Hair Strands. 57-60
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  Yanjun Hu, Li Gao, Xiaoping Ma, Zhigeng Pan, Li Li: A Public-key Asymmetric Robust Watermarking Algorithm Based on Signal with Special Correlation Characteristic. 61-64
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  Chunhong Cao, Wenhui Li: New Method for Geometric Constraint Solving Based on the Genetic Quantum Algorithm. 65-68
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  Nils Jensen, Ralf Einhorn, Gabriele von Voigt: A Supply-Chain for Computer-Mediated Communication and Visualization. 69-72
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  Zhefan Jin, Jiaoying Shi: A Geometry Data Independent Load Balancing Method For Graphics Parallel Rendering. 73-76
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  Hamidreza Rashidy Kanan, Karim Faez: Wave Height Forecasting Using Cascade Correlation Neural Network. 77-80
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  Levente Kovács, Tamás Szirányi: Coding of Stroke-Based Animations. 81-84
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  Frank-Lothar Krause, Martin Göbel, Alain Roger Biahmou Tchebetchou, Gerold Wesche: A Three-stage Conceptual Design Process Using Virtual Environments. 85-88
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  Filip Krolupper: Recognition of Occluded Objects Using Curvature. 89-92
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  Robert G. Laycock, Andy M. Day: Towards the Automatic Integration of Ground Level Images into a Virtual Urban Environment. 93-96
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  Disi Lian, Ilias Oraifige, F. Richard Hall: Real-time Finite Element Analysis with Virtual Hands: An Introduction. 97-100
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  Vlastimil Milér, Bohuslav Hudec: Creating Virtual Worlds Using Adapting XML. 101-104
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  Mahdi Mirzabaki: Depth Detection Through Interpolation Functions: A New Method. 105-108
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  Marielle Mokhtari, François Bernier, François Lemieux, H. Martel, Jean-Marc Schwartz, Denis Laurendeau, Alexandra Branzan Albu: Virtual Environment and Sensori-Motor Activities: Haptic, Auditory and Olfactory Devices. 109-112
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  Toshio Moriya, Fumiko Beniyama, Kosei Matsumoto, Tsuyoshi Minakawa, Kei Utsugi, Haruo Takeda: Properties of Three Shadows on a Plane. 113-116
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  Lidia M. Ortega, Francisco R. Feito, Clara I. Grima, Alberto Márquez: Collision Detection Using Polar Diagrams. 117-120
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  Július Parulek, Milos Srámek, Ivan Zahradník: Geometrical Modelling of Muscle Cells Based on Functional Representation of Polygons. 121-124
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  Josef Pelikán, Jan Kostlivý: JaGrLib: Library for Computer Graphics Education. 125-128
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  Carlos Pérez, Óscar Reinoso, Maria Asunción Vicente: Robot Hand Visual Tracking Using an Adaptive Fuzzy Logic Controller. 129-132
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  Massimiliano B. Porcu, Riccardo Scateni: Iterative Stripification of a Triangle Mesh: Focus on Data Structures. 133-136
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  Tomislav Pribanic, Mario Cifrek, Stanislav Peharec: 3D Shape Recovery with no Explicit Video Projector Calibration. 137-140
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  Galina S. Rachkovskaya, Yuriy N. Kharabayev, Natalia S. Rachkovskaya: Computer Graphics of Kinematic Surfaces. 141-144
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  M. Isabel Ramos, Francisco R. Feito, José Antonio Gil: Towards High Precission Digital Elevation Model. 145-148
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  David Rehor, Pavel Slavík, David Kadlecek, Pavel Nahodil: Visualization of Dynamic Behaviour of Multi-Agent Systems. 149-152
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  S. Reruang, Withawat Withayachumnankul, Chuchart Pintavirooj, Surapan Airphaiboon: 3D Shape Extraction Using Photographic Tomography with Its Applications. 153-156
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  Vicente Rosell, Roberto Vivó: Improving Form Factor Accuracy by Projecting into the Hemisphere Base. 157-160
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  Raheel Siddiqui, Muhammad Sher, Khalid Rashid: Face Identification based on Biological Trait using Infrared Images after Cold Effect Enhancement and Sunglasses Filtering. 161-164
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  Ingo Soetebier, Horst Birthelmer, Jörg Sahm: Client-Server Infrastructure for Interactive 3D Multi-User Environments. 165-168
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  Jerzy Stachera, Slawomir S. Nikiel: Fractal Image Compression for Efficient Texture Mapping. 169-172
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  Tet Toe, Tang Van To: Curve Matching using B-spline curve. 173-176
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  Jan Vanek, Bruno Jezek: Real-Time Terrain Visualization on PC. 177-180
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  Maria J. Vicent, Javier Lluch, Roberto Vivó: Natural Lighting of Vegetation based on Polar Planes. 181-184
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  Maria Asunción Vicente, César Fernández Peris, Óscar Reinoso, Carlos Pérez: Robust Object Detection in Complex Background using ICA Compression. 185-188
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  Domenico Vitulano, Fadil Santosa: Information Retrieval of Color Images via Wavelets. 189-192
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  Qiqi Wang, Haiying Xu, Yinlong Sun: Practical Construction of Reflectances for Spectral Rendering. 193-196
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  Pengcheng Xi, Tao Xu: De-noising and Recovering Images Based on Kernel PCA Theory. 197-200
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  Roman Zenka, Pavel Slavík: Non-Photorealistic Walkthroughs Using Flash. 201-204
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  Mohammad Ali Oghabian, F. I. Mohammadi, S. Sarkar, A. R. Karimian: Motion Correction of SPEC Projection before Reconstruction. 205-208
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  Edoardo Ardizzone, Vincenzo Cannella, Daniele Peri, Roberto Pirrone: Automatic Generation of User Interface unisng the Set Description Language. 209-212