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Novel uses of Pinch Gloves™ for virtual environment interaction techniques

Virtual Reality 2002年第3期6卷 122-129页

作者： Bowman, D.A. Wingrave, C.A. Campbell, J.M. Ly, V.Q. Rhoton, C.J. Department of Computer Science Virginia Tech. Blacksburg VA United States College of Computing Graphics Visualization and Usability Center Georgia Institute of Technology GA United States Department of Computer Science (0106) Virginia Tech. Blacksburg VA 24061 United States

The usability of three-dimensional (3D) interaction techniques depends upon both the interface software and the physical devices used. However, little research has addressed the issue of mapping 3D input devices to interaction techniques and applications. This is especially crucial in the field of Virtual Environments (VEs), where there exists a wide range of potential 3D input devices. In this paper, we discuss the use of Pinch Gloves™ - gloves that report contact between two or more fingers - as input devices for VE systems. We begin with an analysis of the advantages and disadvantages of the gloves as a 3D input device. Next, we present a broad overview of three novel interaction techniques we have developed using the gloves, including a menu system, a text input technique, and a two-handed navigation technique. All three of these techniques have been evaluated for both usability and task performance. Finally, we speculate on further uses for the gloves. © Springer-Verlag London Ltd.

关键词： 3D Input Devices Interaction Techniques Pinch Gloves Usability Evaluation Virtual Environments

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Simulator sickness and presence in a high field-of-view virtual environment

Simulator sickness and presence in a high field-of-view virt...

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Conference on Human Factors in Computing Systems

作者： Seay, A. Fleming Krum, David M. Hodges, Larry Ribarsky, William Human Computer Interaction Institute Carnegie Mellon University Pittsburgh PA 15213 United States Graphics Visualization/Usability C. Georgia Institute of Technology Atlanta GA 30332-0170 United States

ISBN: (纸本)1581134541

The effect of field-of-view, display type and user role on the experience of simulator sickness and presence in users of a virtual environment was investigated. A PC based assessment instrument was created to administer the Presence, Immersive Tendencies and Simulator Sickness questionnaires. The field-of-view was found to be the major determinant of both simulator sickness and presence.

关键词： Virtual reality

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A model for the visualization exploration process

A model for the visualization exploration process

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VIS 2002, IEEE Visualisation 2002

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Gertz, Michael Visualization and Graphics Res. Grp. Center for IPIC University of California Davis CA 95616 United States Database and Information Syst. Group Computer Science Department University of California Davis CA 95616 United States

The current state of the art in visualization research places a strong emphasis on different techniques to derive insight from disparate types of data. However, little work has investigated the visualization process itself. The information content of the visualization process-the results, history, and relationships between those results-is addressed by this work. A characterization of the visualization process is discussed, leading to a general model of the visualization exploration process. The model, based upon a new parameter derivation calculus, can be used for automated reporting, analysis, or visualized directly. An XML-based language for expressing visualization sessions using the model is also described. These sessions can then be shared and reused by collaborators. The model, along with the XML representation, provides an effective means to utilize the information within the visualization process to further data exploration.

关键词： visualization

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AR-Campus

AR-Campus

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IEEE International Workshop on Augmented Reality Toolkit

作者： R. Hinn B. Redmer G. Domik Comput. Sci. Comput. Graphics Visualization & Image Process. Paderborn Univ. Germany Computer Science Computer Graphics Visualizatioii and hnage Processing University of Paderborn Germany

AR-Campus is an augmented reality application, designed as a guide through university campus. it offers a 3-D map of the campus area, shows routes to various buildings and offices, and recognizes name tags of universi... 详细信息

关键词： Augmented reality computer science Speech recognition computer graphics Electronic mail Elevators Displays visualization Image processing Information systems

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Shading for Fourier volume rendering

Shading for Fourier volume rendering

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IEEE Symposium on Volume visualization and graphics

作者： A. Entezari R. Scoggins T. Moller R. Machiraju Graphics Usability and Visualization Laboratory Simon Fraser University Canada Randy Scoggins U.S. Army Engineer Research and Development Center USA Computer and Information Science Ohio State Uinversity USA

The work presented here describes two methods to incorporate viable illumination models into Fourier Volume Rendering (FVR). The lack of adequate illumination has been one of the impediments for the wide spread acceptance of FVR. Our first method adapts the Gamma Corrected Hemispherical Shading (GCHS) proposed by Scoggins et al. (2001) for FVR. We achieve interactive rendering for constant diffusive light sources. Our second method operates on data transformed by spherical harmonic functions. This latter approach allows for illumination under varying light directions. It should be noted that we only consider diffuse lighting in this paper. We demonstrate and compare the effect of these two new models on the rendered image and document speed and accuracy improvements.

关键词： Lighting Rendering (computer graphics) Fourier transforms Impedance Frequency Surface treatment Usability visualization Research and development Information science

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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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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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An interactive video system supporting e-commere product placement

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 256-261页

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

ISBN: (纸本)9608052440

Based on the technological progress within the Internet, content like digital video has become more and more popular for any kind of user. Because of these new technologies a merging process of different media types has been started which leads to new kinds of applications. Within this paper such a new application is presented based on an interactive video system for the area of E-commerce. hi order to be competitive as an e-shop provider on the market it is highly important to supply the customers with an recognizable added value concerning the presentation of the product line. The embedding of such a system for using an interactive video in the context of E-commerce is the main focus of this work.

关键词： Electronic commerce

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Modeling and visualizing the cultural heritage data set of Graz 01

Modeling and visualizing the cultural heritage data set of G...

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Proceedings of the 2001 conference on Virtual reality, archeology, and cultural heritage

作者： Christopher Zach Andreas Klaus Joachim Bauer Konrad Karner Markus Grabner VRVis Research Center for Virtual Reality and Visualization and Institute for Computer Graphics and Vision Graz Austria Institute for Computer Graphics and Vision Graz Austria

ISBN: (纸本)9781581134476

The inner city (Old Town) of Graz will be the European cultural capital in 2003. In this paper we present preliminary results on the reconstruction and visualization of this kind of cultural heritage data. Starting with a simple block model obtained by converting 2 1/2 dimensional GIS (geographic information system) data we focus on the image based modeling of the facades. Herein we illustrate a robust search for corresponding points to estimate the relative orientation between image ***, we outline our real-time rendering approach based on a LOD-R-tree concept. Special attention is paid on the LOD (level of detail) generation for historic buildings where two different ways working in 2D and 3D are explained. The visualization system is communicating asynchronously with a database system storing the LOD-R-tree data structure. This client-server configuration provides interactive navigation through the virtual scene and the scalability of a database management system.

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Optimal regular volume sampling 01

Optimal regular volume sampling

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IEEE Conference on visualization

作者： T. Theussl T. Moller M.E. Groller Institute of Computer Graphics and Algorithms Vienna University of Technology Graphics Usability and Visualization Lab Simon Fraser University Canada Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)0780372018

The classification of volumetric data sets as well as their rendering algorithms are typically based on the representation of the underlying grid. Grid structures based on a Cartesian lattice are the de-facto standard for regular representations of volumetric data. In this paper we introduce a more general concept of regular grids for the representation of volumetric data. We demonstrate that a specific type of regular lattice-the so-called body-centered cubic-is able to represent the same data set as a Cartesian grid to the same accuracy but with 29.3% fewer samples. This speeds up traditional volume rendering algorithms by the same ratio, which we demonstrate by adopting a splatting implementation for these new lattices. We investigate different filtering methods required for computing the normals on this lattice. The lattice representation results also in lossless compression ratios that are better than previously reported. Although other regular grid structures achieve the same sample efficiency, the body-centered cubic is particularly easy to use. The only assumption necessary is that the underlying volume is isotropic and band-limited-an assumption that is valid for most practical data sets.

关键词： Sampling methods Lattices Signal sampling computer graphics Data visualization Signal processing algorithms Physics Energy states Image processing Image sampling

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