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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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Characteristics Analysis of Moving Conversations to Detect Events on Twitter 14

Characteristics Analysis of Moving Conversations to Detect E...

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14th IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, ASONAM 2022

作者： Senaratne, Hansi Lehle, Dominic Schreck, Tobias Earth Observation Center German Aerospace Center Oberpfaffenhofen Germany Advanced Research & Technologies Avira Tettnang Germany Inst. of Computer Graphics & Knowledge Visualization Graz University of Technology Graz Austria

ISBN: (纸本)9781665456616

A conversation is an exchange of thoughts, news, or ideas about a particular topic between two or more people. On Twit-ter, hashtags allow its users to collate all conversations pertaining to a particular topic. The progressions that occur in such conversations through the geographic space, the time, or the thematic contexts, create trajectories of conversations on Twitter, and they can give us valuable insights into interesting events that take place around us. In this paper we develop an approach based on data analysis and visualisation, to (1) construct such conversation trajectories for chosen popular hashtags, (2) analyse the various geospatial-and content-characteristics of the conversation trajectories (e.g., distance variance, speed of propagation, topic diversity, or credibility) to determine co-located events, and (3) rank and sort the resulting conversation trajectories according to a user-defined interestingess-measure, to narrow down the search space for interesting conversation trajectories. Our approach is among the first to introduce the us-age of movement of conversations across geographic space and time for the exploratory detection and analysis of events, whereas most existing works use keyword-based text analysis to detect events on Twitter. All the three stages of the approach (construct, analyse, rank & sort) are presented in a visual-interactive interface that allows us to explore Twitter text data without extensive prior knowledge, and benefit from the pure exploratory capabilities of the tool. The usefulness of our approach is demonstrated as a proof-of-concept to detect sports-related events, where we were able to identify the outcome of a contest for Major League Baseball sportsmen on Twitter. © 2022 IEEE.

关键词： Trajectories

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Advanced illumination techniques for GPU-based volume raycasting 09

Advanced illumination techniques for GPU-based volume raycas...

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ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Hadwiger, Markus Ljung, Patric Salama, Christof Rezk Ropinski, Timo VRVis Research Center for Virtual Reality and Visualization Donau-City-Straße 1 A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States 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

ISBN: (纸本)9781450379380

Volume raycasting techniques are important for both visual arts and visualization. They allow efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical simulation. Volume-rendering techniques are also effective for direct rendering of implicit surfaces used for soft-body animation and constructive solid geometry. The focus of this course is on volumetric illumination techniques that approximate physically based light transport in participating media. Such techniques include interactive implementation of soft and hard shadows, ambient occlusion, and simple Monte Carlo-based approaches to global illumination, including translucency and scattering.

关键词： visualization

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The office of the future: A unified approach to image-based modeling and spatially immersive displays 98

The office of the future: A unified approach to image-based ...

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25th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1998

作者： Raskar, Ramesh Welch, Greg Cutts, Matt Lake, Adam Stesin, Lev Fuchs, Henry University of North Carolina at Chapel Hill NSF Science and Technology Center for Computer Graphics and Scientific Visualization CB 3175 Sitterson Hall Chapel Hill NC 27599-3175 United States

ISBN: (纸本)0897919998

We introduce ideas, proposed technologies, and initial results for an office of the future that is based on a unified application of computer vision and computer graphics in a system that combines and builds upon the notions of the CAVE™, tiled display systems, and image-based modeling. The basic idea is to use real-time computer vision techniques to dynamically extract per-pixel depth and reflectance information for the visible surfaces in the office including walls, furniture, objects, and people, and then to either project images on the surfaces, render images of the surfaces, or interpret changes in the surfaces. In the first case, one could designate every-day (potentially irregular) real surfaces in the office to be used as spatially immersive display surfaces, and then project high-resolution graphics and text onto those surfaces. In the second case, one could transmit the dynamic image-based models over a network for display at a remote site. Finally, one could interpret dynamic changes in the surfaces for the purposes of tracking, interaction, or augmented reality applications. To accomplish the simultaneous capture and display we envision an office of the future where the ceiling lights are replaced by computer controlled cameras and "smart" projectors that are used to capture dynamic image-based models with imperceptible structured light techniques, and to display high-resolution images on designated display surfaces. By doing both simultaneously on the designated display surfaces, one can dynamically adjust or autocalibrate for geometric, intensity, and resolution variations resulting from irregular or changing display surfaces, or overlapped projector images. Our current approach to dynamic image-based modeling is to use an optimized structured light scheme that can capture per-pixel depth and reflectance at interactive rates. Our system implementation is not yet imperceptible, but we can demonstrate the approach in the laboratory. Our approach to rende

关键词： Reflection

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Evaluation of active appearance models for cardiac MRI

Evaluation of active appearance models for cardiac MRI

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Workshops Bildverarbeitung fur die Medizin: Algorithmen Systeme Anwendungen, BVM 2006 - Workshop on Image Processing for Medicine: Algorithms - Systems - Applications, BVM 2006

作者： Böhler, Tobias Boskamp, Tobias Müller, Heinrich Hennemuth, Anja Peitgen, Heinz-Otto MeVis - Center for Medical Diagnostic Systems and Visualization Universitätsallee 29 28359 Bremen Germany LS VII Computer Graphics University of Dortmund Otto-Hahn-Strasse 16 44221 Dortmund Germany

ISBN: (纸本)9783540321361

Robust delineation of short-axis cardiac magnetic resonance images (MRI) is a fundamental precondition for functional heart diagnostics. Segmentation of the myocardium and the left ventricular blood pool allows for the analysis of important quantitative parameters. Modelbased segmentation methods based on representative image data provide an inherently stable tool for this *** present an implementation and evaluation of 3-D Active Appearance Models for the segmentation of the left ventricle using actual clinical case images. Models created from varying random data sets have been evaluated and compared with manual segmentations.

关键词： Magnetic resonance imaging

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Probabilistic state machines. Dialog management for inputs with uncertainty 92

Probabilistic state machines. Dialog management for inputs w...

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Proceedings of the ACM Symposium on User Interface Software and Technology

作者： Hudson, Scott Newell, Gary Graphics Visualization and Usability Center College of Computing Georgia Institute of Teehnology Atlanta 30332-0280 GA United States Department of Computer Science University of Arizona Tucson 85721 AZ United States

ISBN: (纸本)0897915496

Traditional models of input work on the assumption that inputs delivered to a system are fairly certain to have occurred as they are reported. However, a number of new input modalities, such as pen-based inputs, hand and body gesture inputs, and voice input, do not share this property. Inputs under these techniques are normally acquired by a process of recognition. As a result, each of these techniques makes mistakes and provides inputs which are approximate or uncertain. This paper considers some preliminry techniques for dialog management in the presence of this uncertainty. These techniques—including a new input model and a set of extended state machine abstractions—will explicitly model uncertainty and handle it as a normal and expected part of the input process.

关键词： Uncertainty analysis

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Two pointer input for 3D interaction 97

Two pointer input for 3D interaction

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Proceedings of the 1997 symposium on Interactive 3D graphics

作者： Robert C. Zeleznik Andrew S. Forsberg Paul S. Strauss Brown University site of the NSF Science and Technology Center for Computer Graphics and Scientific Visualization Providence RI Silicon Graphics Computer Systems

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A hybrid web-based toolkit for human modeling

A hybrid web-based toolkit for human modeling

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1997 Scientific visualization Conference, dagstuhl 1997

作者： Bender, M. Klein, R. Ebert, A. Rodrian, H. Computer Graphics Group Department of Computer Science University of Kaiserslautern Germany Intelligent Visualization and Simulation Systems German Research Center for Artificial Intelligence GmbH Germany Human Modeling Department TECMATH GmbH and Co. KG Kaiserslautern Germany

ISBN: (纸本)0769505031

Modern web-based Scientific visualization applications try to overcome common limitations imposed by limited internet bandwidth, server bottlenecks or network latency. A further aspect is the desire to gain platform independence by solely using instruments which are platform independent by conception: the programming language Java, the Virtual Reality Modeling Language (VRML), or the 3D API *** present a prototype of a hybrid web-based Scientific visualization system which makes use of the increasing computational power of modern desktop workstations and personal computers on the client side, and the superior performance provided by a powerful machine on the server side. In order to achieve high interaction rates and to balance computational load the user can dynamically assign selected tasks to his client or to the *** the scientific field of human modeling we have implemented a hybrid web-based toolkit for the modeling of human muscles and skin. Our application allows the on-line generation and manipulation of three-dimensional implicit muscle models in a heterogeneous network and it offers various parameters to adjust computation and response time versus rendering quality. © 1997 IEEE computer Society.

关键词： Heterogeneous networks

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Information technology for communities: Development of a web-based 3D visualization and cluster computing system for disaster management

Information technology for communities: Development of a web...

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121st ASEE Annual Conference and Exposition: 360 Degrees of Engineering Education

作者： Jin, Ge Dekker, Gerald A. Moreland, John Nicolai, Barbara Jean Department of Computer Information Technology and Graphics College of Technology Purdue University Calumet United States Department of Computer Science Purdue University Calumet United States Center for Innovation through Visualization and Simulation Purdue University Calumet United States

Natural disasters can cause huge loss of life, enormous amounts of property damage to the local communities. Although it is impossible to avoid the natural disasters, human sufferings can be reduced by adopting information technologies to the disaster response missions. In this paper, a web-based 3D visualization and cluster computing system was developed to facilitate and expedite the resource distribution process during a disaster. Our disaster management system utilizes state-of- The- Art computing cluster with 16 nodes of Intel Xeon-E5 processors (16 cores per node) to process the emergency supply requests from the disaster victims, and calculate the optimal resource distribution routes with the consideration of the damaged transportation infrastructures. The optimized resource distribution problem was solved with distributed all pair shortest path algorithm and the vehicle routing algorithm. The web-based 3D visualization system was developed with Google earth engine to display the disaster areas, affected households and resource distribution routes. The computation result from the cluster was automatically uploaded to the web-based 3D visualization system, enabling the users to immediately see the optimal resource distribution routes in a virtual 3D environment. The visualization system is flexible and can be easily adapted to a Google earth enabled mobile devices, desktop monitors as well as a Cave automatic virtual environment (CAVE). A historical disaster data from the Northwest Indiana was used to demonstrate the functionalities of the developed system. © American Society for Engineering Education, 2013.

关键词： Virtual reality

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Novel uses of Pinch Gloves™ for virtual environment interaction techniques

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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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