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Enhanced 3D interaction with augmented visual information

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16th International Conference on Artificial Reality and Telexistence, ICAT 2006

作者： Lee, Dongwook Park, Jinah Computer Graphics and Visualization Lab Digital Media Lab Information and Communications University 119 Munji-ro Yusong-gu Daejeon Korea Republic of

ISBN: (纸本)3540497765

As 3D graphics environment becomes the standards for most computer systems, it is natural to seek a 3D input device for manipulating an object in a 3D virtual world. Unlike 2D interface, however, 3D interface creates perceptual mismatches including depth perception problem. The objective of our research is to enhance the depth perception and 3D interaction by providing additional information based on the pictorial depth cues and interaction cues. In this paper, we investigated how to incorporate such cues. We designed two kinds of additional viewport that are to be placed on the top of the interaction window. One is a basic additional view with a different FOV, and the other is a compound view made up with 9 small sub-views with varying viewing direction. We also implemented two behaviors of the augmented view with respect to user interaction: Interactive Resizing and Holding-Z. Through a set of user performance tests, we have concluded that the basic additional view with Interactive Resizing and the additional compound view made statistically significant improvement on the performance of 3D interaction with a 3D input device. Keywords: Virtual Environment, Human computer Interaction. © 2006 Springer-Verlag Berlin/Heidelberg.

关键词： Virtual reality

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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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Revealing the Invisible: Visual Analytics and Explanatory Storytelling for Advanced Team Sport Analysis

Revealing the Invisible: Visual Analytics and Explanatory St...

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2018 International Symposium on Big Data Visual and Immersive Analytics, BDVA 2018

作者： Stein, Manuel Breitkreutz, Thorsten Haussler, Johannes Seebacher, Daniel Niederberger, Christoph Schreck, Tobias Grossniklaus, Michael Keim, Daniel Janetzko, Halldor Department of Computer and Information Science University of Konstanz Germany VIZRT Switzerland Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Austria Department of Geography University of Zurich Switzerland

ISBN: (纸本)9781538691946

The analysis of invasive team sports often concentrates on cooperative and competitive aspects of collective movement behavior. A main goal is the identification and explanation of strategies, and eventually the development of new strategies. In visual sports analytics, a range of different visual-interactive analysis techniques have been proposed, e.g., based on visualization using for example trajectories, graphs, heatmaps, and animations. Identifying suitable visualizations for a specific situation is key to a successful analysis. Existing systems enable the interactive selection of different visualization facets to support the analysis process. However, an interactive selection of appropriate visualizations is a difficult, complex, and time-consuming task. In this paper, we propose a four-step analytics conceptual workflow for an automatic selection of appropriate views for key situations in soccer games. Our concept covers classification, specification, explanation, and alteration of match situations, effectively enabling the analysts to focus on important game situations and the determination of alternative moves. Combining abstract visualizations with real world video recordings by Immersive Visual Analytics and descriptive storylines, we support domain experts in understanding key situations. We demonstrate the usefulness of our proposed conceptual workflow via two proofs of concept and evaluate our system by comparing our results to manual video annotations by domain experts. Initial expert feedback shows that our proposed concept improves the understanding of competitive sports and leads to a more efficient data analysis. © 2018 IEEE.

关键词： visualization

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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...

引用

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 soft union based method for virtual restoration and 3D printing of cultural heritage objects

A soft union based method for virtual restoration and 3D pri...

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2016 Eurographics Workshop on graphics and Cultural Heritage, GCH 2016

作者： Gregor, R. Mavridis, P. Wiltsche, A. Schreck, T. Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria Graz University of Technology Institut für Architektur und Medien Austria

ISBN: (纸本)9783038680116

Recent improvements in 3D acquisition and shape processing methods lead to increased digitization of 3D Cultural Heritage (CH) objects. Beyond the mere digital archival of CH artifacts, there is an emerging research area dedicated to digital restoration of 3D Cultural Heritage artifacts. In particular several methods have been published recently that, from a digitized set of fragments, enable their reassembly or even the synthesis of missing or eroded parts. Usually the result of such methods is a set of aligned but disconnected parts. However, it is often desirable to produce a single, watertight mesh that can be easily 3D printed. We propose a method based on a volumetric soft union operation that can be used to combine such sets of aligned fragments to a single manifold mesh while producing smooth and plausible geometry at the seams. We assess its visual quality and efficiency in comparison to an adaption of the well-known Poisson Reconstruction method. Finally, we provide practical insights on printing the results produced by our method on digitized fragments of real CH objects. © 2016 The Author(s) Eurographics Proceedings © 2016 The Eurographics Association.

关键词： 3D printers

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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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Visualizing the Phonon Map

Visualizing the Phonon Map

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8th Joint Eurographics/IEEE VGTC Symposium on visualization, EuroVis 2006

作者： Deines, E. Michel, F. Bertram, M. Hagen, H. Nielson, G.M. Kaiserslautern Germany Kaiserslautern Germany Computer Graphics and Visualization Group University of Kaiserslautern Germany Arizona State University United States

ISBN: (纸本)3905673312

In this work we present several visualization approaches for analyzing acoustic behavior inside a room. Our methods are based on the results of the phonon tracing algorithm. For a simulated phonon map we examine the influence of the room surfaces on the wave fronts during their propagation from the sound source. Our visualization is based on individual phonon and surface representations as well as scattered data interpolation. Additionally, an observation of acoustic behavior at different positions inside the room using colored and deformed spheres is possible. © The Eurographics Association 2006.

关键词： visualization

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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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Irregular lattices for complex shape grammar facade parsing

Irregular lattices for complex shape grammar facade parsing

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： Hayko Riemenschneider Ulrich Krispel Wolfgang Thaller Michael Donoser Sven Havemann Dieter Fellner Horst Bischof Institute for Computer Graphics and Vision & Computer Graphics and Knowledge Visualization Graz University of Technology Austria

High-quality urban reconstruction requires more than multi-view reconstruction and local optimization. The structure of facades depends on the general layout, which has to be optimized globally. Shape grammars are an established method to express hierarchical spatial relationships, and are therefore suited as representing constraints for semantic facade interpretation. Usually inference uses numerical approximations, or hard-coded grammar schemes. Existing methods inspired by classical grammar parsing are not applicable on real-world images due to their prohibitively high complexity. This work provides feasible generic facade reconstruction by combining low-level classifiers with mid-level object detectors to infer an irregular lattice. The irregular lattice preserves the logical structure of the facade while reducing the search space to a manageable size. We introduce a novel method for handling symmetry and repetition within the generic grammar. We show competitive results on two datasets, namely the Paris 2010 and the Graz 50. The former includes only Hausmannian, while the latter includes Classicism, Biedermeier, Historicism, Art Nouveau and post-modern architectural styles.

关键词： Grammar Shape Lattices Semantics Tiles Cost function Layout

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Interactive high-resolution boundary surfaces for deformable bodies with changing topology

Interactive high-resolution boundary surfaces for deformable...

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8th Workshop on Virtual Reality Interactions and Physical Simulations, VRIPHYS 2011

作者： Wu, Jun Dick, Christian Westermann, Rüdiger Computer Graphics and Visualization Group Technische Universität München Germany State Key Lab of Virtual Reality Technology and Systems Beihang University China

ISBN: (纸本)9783905673876

Recent work has demonstrated that composite finite-elements provide an effective means for physically based modeling of deformable bodies. In this paper we present a number of highly effective improvements of previous work to allow for a high-performance and high-quality simulation of boundary surfaces of deformable bodies with changing topology, for instance, due to cuts and incisions. Starting at a coarse resolution simulation grid, along a cut we perform an adaptive octree refinement of this grid down to a desired resolution and iteratively pull the fine level finite-element equations to the coarse level. In this way, the fine level dynamics can be approximated with a small number of degrees of freedom at the coarse level. By embedding the hierarchical adaptive composite finite-element scheme into a geometric multigrid solver, and by exploiting the fact that during cutting only a small number of cells are modified in each time step, high update rates can be achieved for high resolution surfaces at very good approximation quality. To construct a high quality surface that is accurately aligned with a cut, we employ the dual-contouring approach on the fine resolution level, and we instantly bind the constructed triangle mesh to the coarse grid via geometric constrains. © The Eurographics Association 2011.

关键词： Topology

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