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Interface currents: Supporting fluent face-to-face collaboration 05

Interface currents: Supporting fluent face-to-face collabora...

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International Conference on computer graphics and Interactive Techniques, SIGGRAPH 2005

作者： Hinrichs, Uta Carpendale, Sheelagh Scott, Stacey D. Department of Simulation and Graphics Otto-von-Guericke University Magdeburg Germany Department of Computer Science University of Calgary Canada

ISBN: (纸本)9781450378277

While large displays, such as tabletops and walls, are being developed to technically support collaborative work, the design of interfaces that support face-to-face collaboration is still a challenge [Scott et al. 2003]. We present Interface Currents-flexible containers which provide controllable, automated movement of interface items-in order to support the creative flow during collaborative tasks and to enable intuitive organizing and sharing of digital information around large horizontal displays.

关键词： Flexible displays

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On the semantics of EPCs: Faster calculation for EPCs with small state spaces

On the semantics of EPCs: Faster calculation for EPCs with s...

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4th Workshop of the German Informatics Society (GI) and Meeting of its Working Group "Business Process Management with Event-driven Process Chains (WI-EPK)" on Business Process Management with Event-driven Process Chains, EPK 2005

作者： Cuntz, Nicolas Freiheit, Jörn Kindler, Ekkart Computer Graphics and Multimedia Systems Group University of Siegen Germany Max-Planck-Institute Saarbrücken Germany Computer Science Department University of Paderborn Germany

One of the main features of Event driven Process Chains (EPCs) is the non-local semantics of the OR-join and the XOR-join connectors. Simulating this non-local semantics faithfully and efficiently is still a challenging problem. A year ago, we have shown that the semantics of moderately sized EPCs can be calculated in reasonable time by using techniques from symbolic model checking. For larger EPCs, however, this method still takes too long for practical use. In this paper, we introduce and discuss a new technique for calculating the semantics of EPCs: We combine an explicitly forward construction of the transition system with a backward marking algorithm for checking the non-local constraints. Though this method does not always provide a result, it works for most practical examples and, in most cases, it is much faster than the symbolic algorithm. Basically, the computation time is linear in the size of the resulting transition system. The algorithm works for large EPCs as long as the resulting transition systems are small (where transition systems with millions of states and transitions are still considered to be small), which is true for many practical EPCs.

关键词： Semantics

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self-CD: Interactive self-collision detection for deformable body simulation using GPUs

self-CD: Interactive self-collision detection for deformable...

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Third Asian Simulation Conference, Asiasim 2004

作者： Choi, Yoo-Joo Kim, Young J. Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans Univesity Seoul Korea Republic of

This paper presents an efficient self-collision detection algorithm for deformable body simulation using programmable graphics processing units (GPUs). The proposed approach stores a triangular mesh representation of a deformable model as ID textures and rapidly detects self-collisions between all pairs of triangular primitives using the programmable SIMD capability of GPUs [1]. Since pre-computed spatial structure such as bounding volume hierarchy is not used in our algorithm, our algorithm does not require expensive runtime updates to such complex structure as the underlying model deforms. Moreover, in order to overcome a potential bottleneck between CPU and GPU, we propose a hierarchical encoding/decoding scheme using multiple off-screen buffers and multi-pass rendering techniques, which reads only a region of interests in the resulting off-screen buffer. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Algorithms

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A system for real-time watercolour rendering

A system for real-time watercolour rendering

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computer graphics International 2005, CGI 2005

作者： Burgess, Jeremy Wyvill, Geoff King, Scott A. Computer Graphics and Vision Research Group Department of Computer Science University of Otago New Zealand Computing and Mathematical Sciences Texas A and M-Corpus Christi United States

ISBN: (纸本)0780393309

We present a system for the real-time rendering of scenes to produce images like watercolour paintings. Our system uses a hybrid of object space rendering techniques and image plane post processing to attain extremely good results very quickly. We achieve this through graphics Processing Unit (GPU) programming, hardware accelerated shadow volumes, and the use of noise for various different tasks. We manage to circumvent problems found in both previous image space and object space methods by combining the two. © 2005 IEEE.

关键词： Color image processing

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Combining silhouettes, surface, and volume rendering for surgery education and planning

Combining silhouettes, surface, and volume rendering for sur...

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7th Joint Eurographics - IEEE VGTC Symposium on Visualization, VisSym 2005

作者： Tietjen, Christian Isenberg, Tobias Preim, Bernhard Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany Department of Computer Science University of Calgary Canada

ISBN: (纸本)3905673193

We introduce a flexible combination of volume, surface, and line rendering. We employ object-based edge detection because this allows a flexible parametrization of the generated lines. Our techniques were developed mainly for medical applications using segmented patient-individual volume datasets. In addition, we present an evaluation of the generated visualizations with 8 medical professionals and 25 laypersons. Integration of lines in conventional rendering turned out to be appropriate. © The Eurographics Association 2005.

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Collaborative and immersive medical education in a virtual workbench environment

Collaborative and immersive medical education in a virtual w...

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9th International Conference on Knowledge-Based Intelligent Information and Engineering Systems, KES 2005

作者： Choi, Yoo-Joo Choi, Soo-Mi Rhee, Seon-Min Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of School of Computer Engineering Sejong University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans Univesity Seoul Korea Republic of

ISBN: (纸本)3540288961

In this paper we introduce a framework for an advanced medical education in a table-type VR environment, which is based on an efficient deformable modeling for the interactive manipulation of soft tissues and a realistic motion simulation for dynamic human organs. The proposed framework includes two data storages with 3D/4D models and the 2D anatomic information, and various functional modules that are used to effectively explain human organs by visualizing and synchronizing with the components in the data storages. In our VR environment, a table-type virtual workbench is effectively used for the collaborative and realistic presentation to a group of learners and the video-based tracking environment provides the convenience for a user to select and to manipulate a subject of learning. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Medical education

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Illustrative visualization

Illustrative visualization

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VIS 05: IEEE Visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： Visualization

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Ship hull fitting using NURBS

Ship hull fitting using NURBS

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2nd Conference on computer graphics, Imaging, and Vision: New Trends 2005

作者： Wen, Ang Swee Shamsuddin, Siti Mariyam Hj Samian, Yahya Department of Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Department of Marine Technology Faculty of Mechanical Engineering Universiti Teknologi Malaysia

ISBN: (纸本)0769523927

Ship hull form module is the main module in ship design. The problem of creating fair ship hull surface is of major importance in computer Aided Ship Design environment. The fairness of these surfaces is generally considered a subjective notion depending on the judgment of the designers (e.g. visually pleasing, devoid of unnecessary bumps or wiggles, satisfying certain continuity requirements). One of the restriction in ship hull design is that the existing details of a ship design on paper or a ship that already been constructed physically couldn't be reconstructed accurately and concisely in a ship hull design software. This problem can take on many different characteristics, depending on the goal of the reconstruction, the origin of the offset, and tools or methods available to tackle the job. All of these must be taken into account in developing the best approach to solving the problem in the most efficient manner. In this research, the implementation of NURBS method is used because it brings the most convincing results. © 2005 IEEE.

关键词： Structural design

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Feature-preserving mesh denoising via bilateral normal filtering

Feature-preserving mesh denoising via bilateral normal filte...

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computer Aided Design and computer graphics, 2005. Ninth International Conference on

作者： Kai-Wah Lee Wen-Ping Wang Computer Graphics Group Department of Computer Science The University of Hong Kong

ISBN: (纸本)0769524737

In this paper, we propose a feature-preserving mesh denoising algorithm which is effective, simple and easy to implement. The proposed method is a two-stage procedure with a bilateral surface normal filtering followed by integration of the normals for least squares error (LSE) vertex position updates. It is well-known that normal variations offer more intuitive geometric meaning than vertex position variations. A smooth surface can be described as one having smoothly varying normals whereas features such as edges and corners appear as discontinuities in the normals. Thus we cast feature-preserving mesh denoising as a robust surface normal estimation using bilateral filtering. Our definition of "intensity difference" used in the influence weighting function of the bilateral filter robustly prevents features such as sharp edges and corners from being washed out. We will demonstrate this capability by comparing the results from smoothing CAD-like models with other smoothing algorithms.

关键词： image denoising mesh generation smoothing methods CAD-like model smoothing bilateral surface normal filtering feature-preserving mesh denoising influence weighting function intensity difference least squares error vertex position

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Two remarks on reconstructing binary vectors from their absorbed projections

Two remarks on reconstructing binary vectors from their abso...

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12th International Conference on Discrete Geometry for computer Imagery, DGCI 2005

作者： Kuba, Attila Woeginger, Gerhard J. Department of Image Processing and Computer Graphics University of Szeged H-6720 Szeged Arpad ter 2 Hungary Department of Mathematics and Computer Science TU Eindhoven P.O. Box 513 5600 MB Eindhoven Netherlands

We prove two small results on the reconstruction of binary matrices from their absorbed projections: (1) If the absorption constant is the positive root of x2 + x - 1 = 0, then every row is uniquely determined by its ... 详细信息

关键词： Binary codes

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