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Delocalized unsteady vortex region detectors

Delocalized unsteady vortex region detectors

引用

13th International Fall Workshop Vision, Modeling, and Visualization 2008, VMV 2008

作者： Fuchs, Raphael Peikert, Ronald Sadlo, Filip Alsallakh, Bilal Gröller, Meister Eduard Institute of Computer Graphics and Algorithms TU Vienna Austria VRVis Research Center for Virtual Reality and Visualization Vienna Austria Computer Graphics Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781586039219

In this paper we discuss generalizations of instantaneous, local vortex criteria. We incorporate information on spatial context and temporal development into the detection process. The presented method is generic in so far that it can extend any given Eulerian criterion to take the Lagrangian approach into account. Furthermore, we present a visual aid to understand and steer the feature extraction process. We show that the delocalized detectors are able to distinguish between connected vortices and help understanding regions of multiple interacting vortex structures. The delocalized detectors extract smoother structures and reduce noise in the vortex detection result.

关键词： Vortex flow

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On-line boosting for car detection from aerial images

On-line boosting for car detection from aerial images

引用

2007 IEEE International Conference on Research, Innovation and Vision for the Future, RIVF 2007

作者： Nguyen, Thuy Thi Grabner, Helmut Bischof, Horst Gruber, Barbara Institute for Computer Graphics and Vision Graz University of Technology Austria VRVis Research Center for Virtual Reality and Visualization Graz Austria

ISBN: (纸本)1424406943

In this paper, we present a new approach for automatic car detection from aerial images. The system exploits a robust machine learning method known as boosting for efficient car detection from high resolution aerial images. We propose to use on-line boosting with interactive training framework to efficiently train and improve the detector. We use integral images for fast computation of features. This also allows to perform exhaustive search for detection of cars after training. For post processing, we employ a mean shift clustering method, which improves the detection rate significantly. In contrast to related work, our framework does not rely on any priori knowledge of the image like a site-model or contextual information, but if necessary this information can be incorporated. An extensive set of experiments on high resolution aerial images using the new UltraCamD shows the superiority of our approach. © 2007 IEEE.

关键词： Tracking (position)

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Metropogis: A semi-automatic city documentation system

Metropogis: A semi-automatic city documentation system

引用

2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Klaus, Andreas Bauer, Joachim Karner, Konrad Schindler, Konrad VRVis Research Center for Virtual Reality and Visualization United States Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we report on a new system to enhance a 3D block model of a real city with terrestrial measured data of the facades. The terrestrial data consists of photographs taken by a hand-held digital consumer camera using short baselines. The relative orientation of the photographs is calculated automatically and fitted towards the 3D block model with minimized human input using vanishing points. The introduced city documentation system delivers a fully 3D geographic information data set and is called MetropoGIS. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Geographic information systems

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Metropogis: A feature based city modeling system

Metropogis: A feature based city modeling system

引用

2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Bauer, Joachim Klaus, Andreas Karner, Konrad Zach, Christopher Schindler, Konrad VRVis Research Center for Virtual Reality and Visualization United States Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we report on a system to extract 3D information from oriented digital facade images using various feature extraction/matching methods. We emphasize on 2D feature extraction from digital images including contour chains, line segments and vanishing points. The extraction of 3D primitives is based on line matching over multiple oriented views and 3D plane detection by a line grouping process. The MetropoGIS system is designed for the automatic extraction of 3D data from facade images. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Feature extraction

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self-CD: Interactive self-collision detection for deformable body simulation using GPUs

self-CD: Interactive self-collision detection for deformable...

引用

Third Asian Simulation Conference, Asiasim 2004

作者： Choi, Yoo-Joo Kim, Young J. Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans Univesity Seoul Korea Republic of

This paper presents an efficient self-collision detection algorithm for deformable body simulation using programmable graphics processing units (GPUs). The proposed approach stores a triangular mesh representation of a deformable model as ID textures and rapidly detects self-collisions between all pairs of triangular primitives using the programmable SIMD capability of GPUs [1]. Since pre-computed spatial structure such as bounding volume hierarchy is not used in our algorithm, our algorithm does not require expensive runtime updates to such complex structure as the underlying model deforms. Moreover, in order to overcome a potential bottleneck between CPU and GPU, we propose a hierarchical encoding/decoding scheme using multiple off-screen buffers and multi-pass rendering techniques, which reads only a region of interests in the resulting off-screen buffer. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Algorithms

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Interaction-enhanced simulation workspace for immersive collaboration

Interaction-enhanced simulation workspace for immersive coll...

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Asian Simulation Conference 2005, ASC 2005 and the 6th International Conference on System Simulation and Scientific Computing, ICSC 2005

作者： Kim, Myoung-Hee Rhee, Seon-Min Park, Jiyoung Kim, Ju-Haye Cho, Eun You, Hyo-Sun Dept. of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans University Seoul Korea Republic of

A large surround display such as a CAVE™-like system can be used as an immersive and collaborative simulation workspace, since it maximizes visual realism by a stereo effect. However, methods for working interactively in a 3D workspace rather than on a 2D display are not yet sufficiently developed. We suggest three interaction techniques to enhance a simulation workspace for immersive collaboration. The transparent panel interface is an intermediate medium which helps direct interaction such as object selection, manipulation and navigation. A miniature of the virtual world is shown through the panel, and the user interacts with that instead of with virtual objects which may be located far from them. The visual guider provides depth information which allows a user to know the distance from a virtual object and where they are in a large virtual environment. Vision-based tracking using IR makes it possible to interact naturally and intuitively with objects.

关键词： Human computer interaction

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Multiresolution reconstruction of pipe-shaped objects from contours

引用

5th International Conference on Computational Science, ICCS 2005

作者： Min, Kyungha Lee, In-Kwon Center for Computer Graphics and Virtual Reality Ewha Womans Univ. Seoul Korea Republic of Dept. of Computer Science Yonsei Univ. Seoul Korea Republic of

ISBN: (纸本)9783540260325

We reconstruct pipe-shaped objects from a set of contours, each of which is extracted from an image representing a slice sampled from 3D volume data. The contours are formed by connecting the intersection points between rays cast from a central pixel of an image slice and the boundary of the shape. The edges on the contours are classified into several types, which are exploited in triangulating the contours, thus eliminating most of the floating-point computation from the tiling. Initially, contours of lowest resolution are extracted to reconstruct a lowest-resolution object, which is refined by adding points to the contours. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Digital arithmetic

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Collaborative and immersive medical education in a virtual workbench environment

Collaborative and immersive medical education in a virtual w...

引用

9th International Conference on Knowledge-Based Intelligent Information and Engineering Systems, KES 2005

作者： Choi, Yoo-Joo Choi, Soo-Mi Rhee, Seon-Min Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of School of Computer Engineering Sejong University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans Univesity Seoul Korea Republic of

ISBN: (纸本)3540288961

In this paper we introduce a framework for an advanced medical education in a table-type VR environment, which is based on an efficient deformable modeling for the interactive manipulation of soft tissues and a realistic motion simulation for dynamic human organs. The proposed framework includes two data storages with 3D/4D models and the 2D anatomic information, and various functional modules that are used to effectively explain human organs by visualizing and synchronizing with the components in the data storages. In our VR environment, a table-type virtual workbench is effectively used for the collaborative and realistic presentation to a group of learners and the video-based tracking environment provides the convenience for a user to select and to manipulate a subject of learning. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Medical education

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Advanced medical image visualization and analysis systems for diagnosis and treatment planning

Advanced medical image visualization and analysis systems fo...

引用

Proceedings of 2004 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2004

作者： Kim, Myoung-Hee Lee, Yu-Bu Choi, Yoo-Joo Department of Computer Science and Engineering Ewha Womans University Daehyun-Dong Seodaemun-Ku Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans University Daehyun-Dong Seodaemun-Ku Seoul Korea Republic of

ISBN: (纸本)0780386396

Most medical image processing techniques require the clinician to form a mental model of the anatomy being depicted. We present systems that allow a more direct visualization of anatomical shapes and measurement of parameters from medical image data, including time-dependent and multi-modal images sets. Cardiac-Station realistically represents heart motion and extracts clinical parameters from ventricular MR images, in the diagnosis of heart disease. Brain-Reg displays abnormal regions of the brain by registering multi-modal images, and supports the analysis of differences in the hippocampus between patients and a control group. © 2004 IEEE.

关键词： Magnetic resonance imaging

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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...

引用

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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