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13th SIGCSE Technical Symposium on computer Science Education, SIGCSE 1999

作者： Gould, Daniel L. Simpson, Rosemary M. Van Dam, Andries Brown University NSF Science and Technology Center Computer Graphics and Scientific Visualization Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)9781581130850

We describe some issues in designing and building educational Java applets for an introductory computer graphics course. The design problem involves balancing educational goals of building intuition about fundamental concepts in a domain against heterogeneity both in subject material and in student backgrounds. We present our design approach for resolving these forces - fine-grained units addressing small concepts - and discuss its effects on other areas including hypertext structure, interface design, and software engineering. © 1999 ACM.

关键词： User interfaces

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SKETCH: An interface for sketching 3d scenes

SKETCH: An interface for sketching 3d scenes

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ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Zeleznik, Robert C. Herndon, Kenneth P. Hughes, John F. Brown University NSF Science and Technology Center for Computer Graphics and Scientific Visualization PO Box 1910 Providence RI 02912 United States

Sketching communicates ideas rapidly through approximate visual images with low overhead (pencil and paper), no need for precision or specialized knowledge, and ease of low-level correction and revision. In contrast, most 3D computer modeling systems are good at generating arbitrary views of precise 3D models and support high-level editing andrevision. The SKETCH application described in this paper attempts to combine the advantages of each in order to create an environment for rapidly conceptualizing and editing approximate 3D scenes. To achieve this, SKETCH uses simple non-photorealistic rendering and a purely gestural interface based on simplified line drawings of primitives that allows all operations to be specified within the 3D world.

关键词： Three dimensional computer graphics

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A multimodal interface framework for using hand gestures and speech in virtual environment applications 3rd

A multimodal interface framework for using hand gestures and...

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3rd International Gesture Workshop on Gesture-Based Communication in Human-computer Interaction, GW 1999

作者： Laviola, Joseph J. Brown University Site of the NSF Science and Technology Center Computer Graphics and Scientific Visualization PO Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)3540669353

Recent approaches to providing users with a more natural method of interacting with virtual environment applications have shown that more than one mode of input can be both beneficial and intuitive as a communication medium between humans and computer applications. Hand gestures and speech appear to be two of the most logical since users will typically be in environments that will have them immersed in a virtual world with limited access to traditional input devices such as the keyboard or the mouse. In this paper, we describe an ongoing research project to develop multimodal interfaces that incorporate 3D hand gestures and speech in virtual environments. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Virtual reality

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2D/3D non-rigid registration of volumetric CT lung data using thin-plate spline

2D/3D non-rigid registration of volumetric CT lung data usin...

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7th International Workshop on Enterprise Networking and Computing in Healthcare Industry (HEALTHCOM 2005)

作者： Kim, J Park, J Digital Ocean and Virtual Environment Center Korea Ocean Research and Development Institute South Korea Computer Graphics and Visualization Lab. Information and Communications University South Korea

ISBN: (纸本)0780389409

In the medical image analysis for the human organs, non-rigid registration is necessary to properly register the local deformation. Especially for the dynamic organs like a heart and lungs, it is essential to process the registration method in three-dimensional space to track their through-plane motion. In this paper, we suggest the 2D/3D non-rigid registration method based on the. corresponding anatomical landmarks using thin-plate spline (TPS). By extending two-dimensional TPS, we developed 3D TPS and computed its bending energy function to register the local deformations of the volumetric time-varying lung CT data. Our experimental results show that our method is suitable for handling volumetric deformation with a small number of anatomical landmarks.

关键词： non-rigid registration deformable volumetric data medical image thin-plate spline and anatomical landmark

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A Study of Transfer Function Generation for Time-Varying Volume Data 2

A Study of Transfer Function Generation for Time-Varying Vol...

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2nd IEEE TCVG / Eurographics International Workshop on Volume graphics, VG 2001

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Visualization And Graphics Research Group Center For Image Processing And Integrated Computing University Of California Department Of Computer Science DavisCA95616 United States

ISBN: (纸本)321183737X

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data may be captured by a single or small set of transfer functions. The criteria which dictate when more than one transfer function is needed were also investigated. Four data sets with different temporal characteristics were used for our study. Results obtained using two different classes of methods are discussed, along with lessons learned. These methods, including a new multiresolution opacity map approach, can be used for semi-automatic generation of transfer functions to explore large-scale time-varying data sets. © VG 2001. All rights reserved.

关键词： Transfer functions

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Providing high-level control and expert assistance in the user interface presentation design 93

Providing high-level control and expert assistance in the us...

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Proceedings of the INTERCHI '93 Conference on Human Factors in Computing Systems

作者： Kim, Won Chul Foley, James D. Department of Electrical Engineering and Computer Science The George Washington University Washington DC Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9051991339

Current user interface builders provide only low-level assistance, because they have knowledge of neither the application, nor the principles by which interface elements are combined effectively. We have developed a framework that unites the knowledge components essential for effective user interface presentation design. The framework consists of an application model (both a data model and a control model), a design process model that supports top-down iterative development, and graphic design knowledge that is used both to place dialog box elements such that their application dependent logical relationships are visually reinforced and to control design symmetry and balance. To demonstrate the framework's viability, we have constructed a tool based on encapsulated design knowledge that establishes high-level style preferences and provides expert assistance for the dialog box presentation design and menu structuring.

关键词： UI design process

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BrainCove: A tool for voxel-wise fMRI brain connectivity visualization

BrainCove: A tool for voxel-wise fMRI brain connectivity vis...

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Van Dixhoorn, A.F. Milles, J. Van Lew, B. Botha, C.P. Computer Graphics and Visualization Dept. of INSY Delft University of Technology Delft Netherlands LKEB Dept. of Radiology Leiden University Medical Center Leiden Netherlands

ISBN: (纸本)9783905674385

Functional brain connectivity from fMRI studies has become an important tool in studying functional interactions in the human brain as a complex network. Most recently, research has started focusing on whole brain functional networks at the voxel-level, where fMRI time-signals at each voxel are correlated with every other voxel in the brain to determine their functional connectivity. For a typical 4mm isotropic voxel resolution, this results in connectivity networks with more than twenty thousand nodes and over 400 million links. These cannot be effectively visualized or interactively explored using node-link representations, and due to their size are challenging to show as correlation matrix bitmaps. In this paper, we present a number of methods for the visualization and interactive visual analysis of this new high resolution brain network data, both in its matrix representation as well as in its anatomical context. We have implemented these methods in a GPU raycasting framework that enables real-time interaction, such as network probing and volume deformation, as well as real-time filtering. The techniques are integrated in a visual analysis application in which the different views are coupled, supporting linked interaction. Furthermore, we allow visual comparison of different brain networks with side-by-side and difference visualization. We have evaluated our approach via case studies with domain scientists at two different university medical centers. © The Eurographics Association 2012.

关键词： visualization

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Comparative visualization for diffusion tensor imaging group study at multiple levels of detail

Comparative visualization for diffusion tensor imaging group...

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2017 Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2017

作者： Zhang, C. Höllt, T. Caan, M.W.A. Eisemann, E. Vilanova, A. Computer Graphics and Visualization Delft University of Technology Delft Netherlands Computational Biology Center Leiden University Medical Center Leiden Netherlands Brain Imaging Center Academic Medical Center University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)9783038680369

Diffusion Tensor Imaging (DTI) group studies often require the comparison of two groups of 3D diffusion tensor fields. The total number of datasets involved in the study and the multivariate nature of diffusion tensors together make this a challenging process. The traditional approach is to reduce the six-dimensional diffusion tensor to some scalar quantities, which can be analyzed with univariate statistical methods, and visualized with standard techniques such as slice views. However, this provides merely part of the whole story due to information reduction. If to take the full tensor information into account, only few methods are available, and they focus on the analysis of a single group, rather than the comparison of two groups. Simultaneously comparing two groups of diffusion tensor fields by simple juxtaposition or superposition is rather impractical. In this work, we extend previous work by Zhang et al. [ZCH∗17] to visually compare two groups of diffusion tensor fields. To deal with the wealth of information, the comparison is carried out at multiple levels of detail. In the 3D spatial domain, we propose a details-on-demand glyph representation to support the visual comparison of the tensor ensemble summary information in a progressive manner. The spatial view guides analysts to select voxels of interest. Then at the detail level, the respective original tensor ensembles are compared in terms of tensor intrinsic properties, with special care taken to reduce visual clutter. We demonstrate the usefulness of our visual analysis system by comparing a control group and an HIV positive patient group. © 2017 The Eurographics Association.

关键词： Tensors

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An interactive video system for live coverage transmission using real time video hyperlinks

Advances in Automation, Multimedia and Video Systems, and Mo...

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Advances in Automation, Multimedia and Video Systems, and Modern computer Science 2001年 309-313页

作者： Wichert, Reiner Finke, Matthias Balfanz, Dirk Mobile Information Visualization Computer Graphics Center Rundeturmstrasse 6 64283 Darmstadt Germany

ISBN: (纸本)9608052440

In this paper, we present a system developed for getting additional information from real time video hyperlinks within a live video. It is realized by introducing markers in the scene, which can be detected by the system itself. The primary advantage of the system is the generation of real time video hyperlinks by the video content itself. The system uses optical markers to link the additional information to the object of interest. Any retrieval of additional information is initialized by a user request. Finally, a first system prototype demonstrates the validity of this approach and shows the potential of this application.

关键词： Video signal processing

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Advanced illumination for gpu volume

Advanced illumination for gpu volume

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ACM SIGGRAPH ASIA 2008 Courses, SIGGRAPH Asia'08

作者： Salama, Christof Rezk Ropinski, Timo Hadwiger, Markus Ljung, Patric Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany VRVis Research Center for Virtual Reality and Visualization Donau-City-StraBe A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States

Volume raycasting techniques are important for both visual arts and. They allow an efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical. Thanks to their flexibility, experts agree that GPU-based is the state-of-the art technique for interactive volume *** most likely replace existing slice-based techniques in the near. Volume rendering techniques are also effective for the direct rendering implicit surfaces used for soft body animation and constructive *** starts off with an in-depth introduction to the concepts GPU-based ray-casting to provide a common base for the following. The focus of this course is on advanced illumination techniques approximate the physically-based light transport more convincingly. techniques include interactive implementation of soft hard shadows, ambient occlusion and simple Monte-Carlo based approaches global illumination including translucency and scattering. the proposed techniques, users are le to interactively create images from volumetric data whose visual quality goes far traditional approaches. The optical properties in participating are defined using the phase function. Many approximations to the based light transport applied for rendering natural phenomena as clouds or smoke assume a rather homogenous phase function. For rendering volumetric scans on the other hand different phase models are required to account for both surface-like structures fuzzy boundaries in the data. Using volume rendering techniques,who create medical visualization for science magazines may now work on tomographic scans directly, without the necessity to fall back to creating polygonal models of anatomical structures.

关键词： Volume rendering

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