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Interactive cross-detector analysis of vortical flow data

Interactive cross-detector analysis of vortical flow data

引用

International Conference on Coordinated and Multiple Views in Exploratory Visualization

作者： Raphael Burger Philipp Muigg Helmut Doleisch Helwig Hauser VRVis Research Center Vienna Austria Institute of Computer Graphics University of Technology Vienna Austria

ISBN: (纸本)9780769529035;0769529038

In this paper we discuss the application of multiple linked views for advanced vortex investigation in flow data. Local feature detectors and additional measures integrate into an interactive flow feature detection system based on multiple linked views. We discuss how linking and brushing of derived feature information can lead to increased performance in interactive feature analysis. In a case study we demonstrate how the possibility to integrate the information of multiple detectors leads to sound understanding of vortex type features. Enhanced credibility and combined advantages of several detectors can be achieved by uniting the results of multiple feature detectors in multiple coordinated views.

关键词： Detectors computer vision Motion analysis Feature extraction Motion detection Noise robustness Computational fluid dynamics computer graphics Data engineering Fluid dynamics

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Feature Emphasis and Contextual Cutaways for Multimodal Medical Visualization

Feature Emphasis and Contextual Cutaways for Multimodal Medi...

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9th Joint Eurographics/IEEE VGTC Symposium on Visualization, EuroVis 2007

作者： Burns, Michael Haidacher, Martin Wein, Wolfgang Viola, Ivan Gröller, M. Eduard Imaging and Visualization Department Siemens Corporate Research PrincetonNJ United States Computer Science Department Princeton University United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Informatics University of Bergen Norway

ISBN: (纸本)9783905673456

Dense clinical data like 3D Computed Tomography (CT) scans can be visualized together with real-time imaging for a number of medical intervention applications. However, it is difficult to provide a fused visualization that allows sufficient spatial perception of the anatomy of interest, as derived from the rich pre-operative scan, while not occluding the real-time image displayed embedded within the volume. We propose an importance-driven approach that presents the embedded data such that it is clearly visible along with its spatial relation to the surrounding volumetric material. To support this, we present and integrate novel techniques for importance specification, feature emphasis, and contextual cutaway generation. We show results in a clinical context where a pre-operative CT scan is visualized alongside a tracked ultrasound image, such that the important vasculature is depicted between the viewpoint and the ultrasound image, while a more opaque representation of the anatomy is exposed in the surrounding area. © The Eurographics Association 2007.

关键词： Visualization

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Augmented Reality Scouting for Interactive 3D Reconstruction

Augmented Reality Scouting for Interactive 3D Reconstruction

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IEEE Annual International Symposium Virtual Reality

作者： Bernhard Reitinger Christopher Zach Dieter Schmalstieg Institute for Computer Graphics and Vision Graz University of Technology Austria VRVis Research Center Austria

This paper presents a first prototype of an interactive 3D reconstruction system for modeling urban scenes. An augmented reality scout is a person who is equipped with an ultra-mobile PC, an attached USB camera and a GPS receiver. The scout is exploring the urban environment and delivers a sequence of 2D images. These images are annotated with according GPS data and used iteratively as input for a 3D reconstruction engine which generates the 3D models on-the-fly. This turns modeling into an interactive and collaborative task

关键词： Augmented reality Image reconstruction Layout Image databases Engines Visual databases Cameras Global Positioning System Data visualization Feedback

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Continuous interaction with TDK: Improving the user experience in terralib

Continuous interaction with TDK: Improving the user experien...

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9th Brazilian Symposium on GeoInformatics, GEOINFO 2007

作者： Metello, Marcelo De Sá Vera, Mário Lemos, Melissa Masiero, Leone Pereira De Carvalho, Marcelo Tilio Monteiro Tecgraf - Computer Graphics Technology Group Pontifical Catholic University of Rio de Janeiro Rua Marquês de São Vicente 225 Gávea Rio de Janeiro RJ 22453-900 Brazil

ISBN: (纸本)9788517000362

Historically, visual display has always played a very important role in GIS applications. However, visual exploration tools do not scale well when applied to huge spatial data sets. More recently, faster processing hardware and more sophisticated computer graphics has been used to improve user experience for geospatial data visualization. Some applications have recently introduced the concept that the user should be able to navigate through the data in a smooth and continuous way without being blocked waiting for data to be loaded, even if this means seeing incomplete data for some time. Google Earth and NASA World Wind are recent examples of this concept. This paper describes an architecture incorporated in the TDK (TerraLib Development Kit) open source API to provide support for applications that want this kind of user interaction with Terralib geographical data.

关键词： NASA

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Measurement of human cartilage geometry 07

Measurement of human cartilage geometry

引用

23rd Spring Conference on computer graphics, SCCG 2007

作者： Grabner, Markus Millington, Steven Wozelka, Ralph Jammernegg, Andrea Institute for Computer Graphics and Vision Graz University of Technology Austria MRCentre for Excellence Medical University of Vienna Austria Center for Applied Biomechanics University of Virginia Charlottesville United States Department of Surgery Elisabethinen Hospital Graz Austria

ISBN: (纸本)9781605589565

We present a system to measure geometric properties (e.g., volume, surface area, and contact area) of the cartilage layer in human ankle joints. The cartilage and subchondral bone surfaces are sampled with a stereophotogrammetric device. A configurable pipeline of processing steps is applied to the sampled surface data to compute the desired quantities. The meshes are cleaned (i.e., disconnected parts removed, holes filled, and noise reduced) and aligned to each other such that they represent the cartilage layer as close as possibly. A hierarchical stitching approach creates from two separate (opposing) meshes a single closed surface, which is used for volume calculations. The method has been evaluated with data from 12 lower leg specimens. While our approach confirms the results of previous contact area studies for low curvature regions of the inspected cartilage and bone surfaces, it is superior to existing (mostly mechanical) methods for highly curved regions.. © 2007 ACM 978-1-60558-956-5/07/0004 15.00.

关键词： Cartilage

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A Digital Watermarking Algorithm for Certificate Identifying

A Digital Watermarking Algorithm for Certificate Identifying

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Li Li Nina Sun Bin Luo Institute of Computer Science and Technology Anhui University of Science and Technology China Institute of Graphics and Image Hanghzou Dianzi University China

ISBN: (纸本)9780769529943;0769529941

In this paper we introduce a watermarking arithmetic for certificate identifying. The arithmetic is based on the FMT transformation. We insert special information in the digital photograph of the certificate and study on it after printing and scanning. The relationship of printing resolution, scanning resolution and the image is discussed, which effects the scheme's efficiency. The experiments show that the watermarking algorithm is robust to printing and scanning. Some preprocess is needed before extracting watermark, such as cropping and resizing the print-scan photographic image.

关键词： Watermarking Printing Image resolution Robustness Geometry Space technology computer science computer graphics Digital arithmetic Image quality

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An Approach to a Real World Dynamic Route Guidance Problem

An Approach to a Real World Dynamic Route Guidance Problem

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International Conference on Computational Science and its Applications (ICCSA)

作者： Ahmet Yildiz Canan Yildiz Institute for Traffic System Planning University of Technology Vienna Austria Institute of Computer Graphics and Algorithms University of Technology Vienna Austria

Internationally organised large-scaled events often cause an overload of the host city's public transportation network as the number of people who use the network increases immensely within a relative small timespan and their flow is concentrated to one direction in the network. To efficiently and individually route participants to the events' location using public transport we would like to provide each individual with the quickest path on a network whose attributes constantly change over time. In this paper we give a formal description of this problem, review related work, discuss to what extent they can be used to solve the problem efficiently and finally introduce our approach.

关键词： Transportation Costs Vehicle dynamics Cities and towns computer applications computer networks Application software Telecommunication traffic technology planning computer graphics

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Mumford-Shah Meets Stereo: Integration of Weak Depth Hypotheses

Mumford-Shah Meets Stereo: Integration of Weak Depth Hypothe...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： Thomas Pock Christopher Zach Horst Bischof Institute for Computer Graphics and Vision Graz University of Technology Graz Austria VRVis Research Center Graz Austria

Recent results on stereo indicate that an accurate segmentation is crucial for obtaining faithful depth maps. Variational methods have successfully been applied to both image segmentation and computational stereo. In this paper we propose a combination in a unified framework. In particular, we use a Mumford-Shah-like functional to compute a piecewise smooth depth map of a stereo pair. Our approach has two novel features: First, the regularization term of the functional combines edge information obtained from the color segmentation with flow-driven depth discontinuities emerging during the optimization procedure. Second, we propose a robust data term which adoptively selects the best matches obtained from different weak stereo algorithms. We integrate these features in a theoretically consistent framework. The final depth map is the minimizer of the energy functional, which can be solved by the associated functional derivatives. The underlying numerical scheme allows an efficient implementation on modern graphics hardware. We illustrate the performance of our algorithm using the Middlebury database as well as on real imagery.

关键词： Image segmentation Robustness Markov random fields computer graphics Hardware Optimization methods Image edge detection Shape Image databases Spatial databases

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An Immersive Game for K-5 Math and Science Education

An Immersive Game for K-5 Math and Science Education

引用

International Conference on Information Visualisation (IV)

作者： Nicoletta Adamo-Villani Ronnie Wilbur Department of Computer Graphics Technology Purdue University USA Department of Speech Language and Hearing Sciences Purdue University USA

We present SMILE ™ (Science and Math in an Immersive Learning Environment) an immersive game in which deaf and hearing children ages 5-10 learn math and science concepts and ASL (American Sign Language) terminology through interaction with animated 3D characters and objects. The application can be displayed in stationary, four-wall immersive devices (i.e., the FLEX), Fish Tank VR systems, and non-immersive standard computer systems. Users interact with the program choosing from a variety of input devices including a 6DOF wand, a pinch glove, a data glove, a dance platform, or standard mouse and keyboard.

关键词： Deafness Auditory system Handicapped aids Terminology Animation Application software Marine animals Virtual reality computer displays Data gloves

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People tracking across two distant self-calibrated cameras

People tracking across two distant self-calibrated cameras

引用

IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Roman Pflugfelder Horst Bischof Video and Safety Technology Austrian Research Centers GmbH Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

People tracking is of fundamental importance in multi-camera surveillance systems. In recent years, many approaches for multi-camera tracking have been discussed. Most methods use either various image features or the geometric relation between the cameras or both as a cue. It is a desire to know the geometry for distant cameras, because geometry is not influenced by, for example, drastic changes in object appearance or in scene illumination. However, the determination of the camera geometry is cumbersome. The paper tries to solve this problem and contributes in two different ways. On the one hand, an approach is presented that calibrates two distant cameras automatically. We continue previous work and focus especially on the calibration of the extrinsic parameters. Point correspondences are used for this task which are acquired by detecting points on top of people's heads. On the other hand, qualitative experimental results with the PETS 2006 benchmark data show that the self-calibration is accurate enough for a solely geometric tracking of people across distant cameras. Reliable features for a matching are hardly available in such cases.

关键词： Cameras Calibration Geometry Surveillance Layout Lighting Head Positron emission tomography Image segmentation Robustness

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