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Heterogeneous morphing of multimodal medical information 6th

6th International Conference on computer Analysis of Images and Patterns, CAIP 1995

作者： Jankovič, Vojtech Ružický, Eugen Gröller, Eduard Department of Computer Graphics and Image Processing Comenius University Bratislava842 15 Slovakia Department of Visualization and Animation Institute of Computer Graphics Technical University Vienna Austria

ISBN: (纸本)3540602682

The paper presents a general non-rigid body representation for physically-based modeling of dynamic behaviour of heterogeneous objects and its application in a development of a new heterogeneous morphing technique to solve distortion correction problems arising in the medical data processing. The proposed representation provides a simply applicable tool for modeling of real medical objects allowing fast and reliable calculation of geometric deformations and simulation of dynamic behaviour in a heterogeneous environment when only a few initial landmark displacements are known. The proposed method is applied in a distortion correction process of CT medical data sets, especially in an automatic processing of heterogeneous CT scans of human brain. © Springer-Verlag Berlin Heidelberg 1995.

关键词： computerized tomography

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A virtual reality medical training system 1st

A virtual reality medical training system

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1st International Conference on computer Vision, Virtual Reality, and Robotics in Medicine, CVRMed 1995

作者： Ziegler, Rolf Mueller, Wolfgang Fischer, Georg Goebel, Martin Fraunhofer Institute for Computer Graphics Department Visualization and Simulation Wilhelminenstr. 7 DarmstadtD-64283 Germany

ISBN: (纸本)9783540591207

This paper presents the result of the interdisciplinary cooperation of traumatologists of the Berufsgenossenschaftliche Unfallklinik (BGU) in Frankfurt am Main and a team of computer graphics scientists of the Fraunhofer Institute for computer graphics in Darmstadt. We have developed a highly interactive medical training simulator system for arthroscopy by means of computer graphics and Virtual Reality techniques. This system offers an effective alternative to conventional training systems for training and establishing of arthroscopic techniques. The two main development tasks will be discussed: the 3D reconstruction process and the 3D interaction. © Springer-Verlag Berlin Heidelberg 1995.

关键词： Virtual reality

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Augmentation techniques for efficient exploration in head-mounted display environments 10

Augmentation techniques for efficient exploration in head-mo...

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Proceedings of the 17th ACM Symposium on Virtual Reality Software and Technology

作者： Bolte, Benjamin Bruder, Gerd Steinicke, Frank Hinrichs, Klaus Lappe, Markus Visualization and Computer Graphics Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

ISBN: (纸本)9781450304412

Physical characteristics and constraints of today's head-mounted displays (HMDs) often impair interaction in immersive virtual environments (VEs). For instance, due to the limited field of view (FOV) subtended by the display units in front of the user's eyes more effort is required to explore a VE by head rotations than for exploration in the real world. In this paper we propose a combination of two augmentation techniques that have the potential to make exploration of VEs more efficient: (1) augmenting the geometric FOV (GFOV) used for rendering the VE, and (2) amplifying head rotations while the user changes her head orientation. In order to identify how much manipulation can be applied without users noticing, we conducted two psychophysical experiments in which we analyzed subjects' ability to discriminate between virtual and real head pitch and roll rotations while three different geometric FOVs were used. Our results show that the combination of both techniques has great potential to support efficient exploration of VEs. We found that virtual pitch and roll rotations can be amplified by 30% and 44% respectively, when the GFOV matches the subject's estimation of the most natural FOV. This leads to a possible reduction of the user's effort required to explore the VE using a combination of both techniques by approximately 25%. Copyright © 2010 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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Elastic flattening of painted pottery surfaces

Elastic flattening of painted pottery surfaces

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2018 Eurographics Workshop on graphics and Cultural Heritage, GCH 2018

作者： Preiner, Reinhold Karl, Stephan Baye, Paul Schreck, Tobias Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria University of Graz Department of Archaeology Austria

ISBN: (纸本)9783038680574

Generating flat images from paintings on curved surfaces is an important task in Archaeological analysis of ancient pottery. It allows comparing styles and painting techniques, e.g, for style and workshop attribution, and serves as basis for domain publications which typically use 2d images. To obtain such flat images from scanned textured 3d models of the pottery objects, current practice is to perform so-called rollouts using approximating shape primitives like cones or spheres, onto which the mesh surfaces are projected. While this process provides in intuitive deformation metaphor for the users, it naturally introduces unwanted distortions in the mapping of the surface, especially for vessels with high-curvature profiles. In this work, we perform an elastic flattening of these projected meshes, where stretch energy is minimized by simulating a physical relaxation process on a damped elastic spring model. We propose an intuitive contraction-directed physical setup which allows for an efficient relaxation while ensuring a controlled convergence. Our work has shown to produce images of significantly improved suitability for domain experts' tasks like interpretation, documentation and attribution of ancient pottery. © 2018 GCH 2018 - Eurographics Workshop on graphics and Cultural Heritage. All rights reserved.

关键词： Textures

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Foreword to the special section on 3D object retrieval 2024 symposium (3DOR2024)

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computers and graphics 2025年 129卷

作者： Bustos, Benjamin Biasotti, Silvia Veltkamp, Remco C. Schreck, Tobias Sipiran, Ivan Department of Computer Science University of Chile Chile Millennium Institute Foundational Research on Data (IMFD) Chile Istituto di Matematica Applicata e Tecnologie Informatiche “E. Magenes” - CNR Italy Department of Information and Computing Sciences Utrecht University Netherlands Institute of Computer Graphics and Visualization Technical University of Graz Austria

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Noisevis3D: A framework for interactive 3D traffic noise visualization

Noisevis3D: A framework for interactive 3D traffic noise vis...

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computer graphics and visualization 2008 and Gaming 2008: Design for Engaging Experience and Social Interaction 2008, MCCSIS'08 - IADIS Multi Conference on computer Science and Information Systems

作者： Michel, Frank Wacker, Petra Strupp, Samuel Hagen, Hans IRTG 1131 Department of Computer Science University of Kaiserslautern 67663 Kaiserslautern Germany Computer Graphics and Visualization Department of Computer Science University of Kaiserslautern 67663 Kaiserslautern Germany

ISBN: (纸本)9789728924638

We present NoiseVis3D a framework for the interactive three dimensional visualization of traffic noise. The framework allows the visualization of noise maps in new ways including multilayer 2D maps, volume rendering of noise and isosurfaces besides the usual visualization of 2D noise maps. The three dimensional visualization allows the users to explore the virtual city model and immerse themselves in the current sound situation. The possibility to integrate additional information into the model enables the illustration not only of noise exposure but also vital information for decision makers, investors and local residents. © 2008 IADIS.

关键词： visualization

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On triangulations

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International Conference on Computational Science and its Applications, ICCSA 2004

作者： Kolingerová, Ivana Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Plze Czech Republic

ISBN: (纸本)3540220569

Triangulations in 2D and 3D are a necessary part of many applications. This paper brings a brief survey of main triangulations used in computer graphics and computational geometry, then focuses on Delaunay and greedy triangulations in 2D and 3D and presents their most important properties and algorithms. Then three applications from computer graphics and image processing areas are presented and results discussed. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Triangulation

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Out-of-core interactive display of large meshes using an oriented bounding box-based hardware depth query

Out-of-core interactive display of large meshes using an ori...

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Proceedings of the Seventh IASTED International Conference on computer graphics and Imaging

作者： Ha, Haeyoung Gregorski, Benjamin F. Joy, Kenneth I. Visualization/Comp. Graphics Grp. Department of Computer Science University of California Davis Davis CA United States

In this paper we present an occlusion culling method that uses hardware-based depth queries on oriented bounding boxes to cull unseen geometric primitives efficiently. An out-of-core design enables this method to interactively display data sets that are too large to fit into main memory. During a preprocessing phase, a spatial subdivision (such as an octree or BSP tree) of a given data set is constructed where, for each node, an oriented bounding box containing mesh primitives is computed using principal component analysis (PCA). At runtime, the tree indicated by the spatial subdivision is traversed in front-to-back order, and only nodes that are determined to be visible, based on a hardware accelerated depth query, are rendered.

关键词： Interactive computer graphics

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Visual Analysis of Urban Traffic Data based on High-Resolution and High-Dimensional Environmental Sensor Data 6

Visual Analysis of Urban Traffic Data based on High-Resoluti...

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6th Workshop on Visualisation in Environmental Sciences, EnvirVis 2018 at EuroVis 2018

作者： Häußler, Johannes Stein, Manuel Seebacher, Daniel Janetzko, Halldor Schreck, Tobias Keim, Daniel A. University of Konstanz Department of Computer and Information Science Germany University of Zurich Department of Geography Switzerland Graz University of Technology Institute for Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038680635

Urbanization is an increasing global trend resulting in a strong increase in public and individual transportation needs. Accordingly, a major challenge for traffic and urban planners is the design of sustainable mobility concepts to maintain and increase the long-term health of humans by reducing environmental pollution. Recent developments in sensor technology allow the precise tracking of vehicle sensor information, allowing a closer and more in-depth analysis of traffic data. We propose a visual analytics system for the exploration of environmental factors in these high-resolution and high-dimensional mobility sensor data. Additionally, we introduce an interactive visual logging approach to enable experts to cope with complex interactive analysis processes and the problem of the reproducibility of results. The usefulness of our approach is demonstrated via two expert studies with two domain experts from the field of environment-related projects and urban traffic planning. © 2018 The Author(s) Eurographics Proceedings © 2018 The Eurographics Association.

关键词： computer graphics

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Transitional environments enhance distance perception in immersive virtual reality systems 09

Transitional environments enhance distance perception in imm...

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APGV 2009: Symposium on Applied Perception in graphics and visualization

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Lappe, Markus Ries, Brian Interrante, Victoria Visualization and Computer Graphics Research Group Germany Psychology Department II University of Münster Germany Department of Computer Science and Engineering University of Minnesota United States

ISBN: (纸本)9781605587431

Several experiments have provided evidence that ego-centric distances are perceived as compressed in immersive virtual environments relative to the real world. The principal factors responsible for this phenomenon have remained largely unknown. However, recent experiments suggest that when the virtual environment (VE) is an exact replica of a user's real physical surroundings, the person's distance perception improves. Furthermore, it has been shown that when users start their virtual reality (VR) experience in such a virtual replica and then gradually transition to a different VE, their sense of presence in the actual virtual world increases significantly. In this case the virtual replica serves as a transitional environment between the real and virtual world. In this paper we examine whether a person's distance estimation skills can be transferred from a transitional environment to a different VE. We have conducted blind walking experiments to analyze if starting the VR experience in a transitional environment can improve a person's ability to estimate distances in an immersive VR system. We found that users significantly improve their distance estimation skills when they enter the virtual world via a transitional environment. © 2009 ACM.

关键词： Virtual reality

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