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检索条件"机构=Computer Graphics and Technology"

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Graph-based combinations of fragment descriptors for improved 3D object retrieval 12

Graph-based combinations of fragment descriptors for improve...

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3rd ACM Multimedia Systems Conference, MMSys'12

作者： Schreck, Tobias Scherer, Maximilian Walter, Michael Bustos, Benjamin Yoon, Sang Min Kuijper, Arjan Data Analysis and Visualization Group University of Konstanz Germany Interactive Graphics Systems Technische Universität Darmstadt Germany KDW+PRISMA Department of Computer Science University of Chile Chile Yonsei Institute of Convergence Technology Yonsei University Korea Republic of Fraunhofer Institute for Computer Graphics Research Darmstadt Germany

ISBN: (纸本)9781450311311

3D Object Retrieval is an important field of research with many application possibilities. One of the main goals in this research is the development of discriminative methods for similarity search. The descriptor-based approach to date has seen a lot of research attention, with many different extraction algorithms proposed. In previous work, we have introduced a simple but effective scheme for 3D model retrieval based on a spatially fixed combination of 3D object fragment descriptors. In this work, we propose a novel flexible combination scheme based on finding the best matching fragment descriptors to use in the combination. By an exhaustive experimental evaluation on established benchmark data we show the capability of the new combination scheme to provide improved retrieval effectiveness. The method is proposed as a versatile and inexpensive method to enhance the effectiveness of a given global 3D descriptor approach. © 2012 ACM.

关键词： Self organizing maps

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Porosity maps - Interactive exploration and visual analysis of porosity in carbon fiber reinforced polymers

Porosity maps - Interactive exploration and visual analysis ...

引用

14th Eurographics Conference on Visualization 2012, EuroVis 2012

作者： Reh, A. Plank, B. Kastner, J. Gröller, E. Heinzl, C. University of Applied Sciences Upper Austria Campus Wels Austria Vienna University of Technology Institute of Computer Graphics and Algorithms Vienna Austria

In this work a novel method for the characterization of porosity in carbon fiber reinforced polymers (CFRP) is presented. A visualization pipeline for the interactive exploration and visual analysis of CFRP specimens is developed to enhance the evaluation workflow for non-destructive testing (NDT) practitioners based on specified tasks. Besides quantitative porosity determination and the calculation of local pore properties, i.e., volume, surface, dimensions and shape factors, we employ a drill-down approach to explore pores in a CFRP specimen. We introduce Porosity Maps (PM), to allow for a fast porosity evaluation of the specimen. Pores are filtered in two stages. First a region of interest is selected in the porosity maps. Second, pores are filtered with parallel coordinates according to their local properties. Furthermore a histogram-based best-viewpoint widget was implemented to visualize the quality of viewpoints on a sphere. The advantages of our approach are demonstrated using real world CFRP specimens. We are able to show that our visualization-driven approach leads to a better evaluation of CFRP components than existing reference methods. © 2012 The Author(s).

关键词： Porosity

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SemanticPrism: A multi-aspect view of large high-dimensional data

SemanticPrism: A multi-aspect view of large high-dimensional...

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IEEE Symposium on Visual Analytics Science and technology (VAST)

作者： Victor Yingjie Chen Ahmad M Razip Sungahn Ko Cheryl Zhenyu Qian David S. Ebert Computer Graphics Technology Electrical and Computer Engineering Interaction Design Purdue University

VAST 2012 Mini Challenge 1 Award: Outstanding integrated analysis and visualization. We present a visual analytics system SemanticPrism, which aims to analyze large-scale high-dimensional datasets containing logs of a million computers. SemanticPrism visualizes the data from three different perspectives: geo-temporal, time series curve, and pixel visualization. With each perspective, we use semantic zooming to present more detailed information.

关键词： Data visualization Time series analysis IP networks Semantics Bars Image color analysis Visual analytics

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BrainCove: A tool for voxel-wise fMRI brain connectivity visualization

BrainCove: A tool for voxel-wise fMRI brain connectivity vis...

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Van Dixhoorn, A.F. Milles, J. Van Lew, B. Botha, C.P. Computer Graphics and Visualization Dept. of INSY Delft University of Technology Delft Netherlands LKEB Dept. of Radiology Leiden University Medical Center Leiden Netherlands

ISBN: (纸本)9783905674385

Functional brain connectivity from fMRI studies has become an important tool in studying functional interactions in the human brain as a complex network. Most recently, research has started focusing on whole brain functional networks at the voxel-level, where fMRI time-signals at each voxel are correlated with every other voxel in the brain to determine their functional connectivity. For a typical 4mm isotropic voxel resolution, this results in connectivity networks with more than twenty thousand nodes and over 400 million links. These cannot be effectively visualized or interactively explored using node-link representations, and due to their size are challenging to show as correlation matrix bitmaps. In this paper, we present a number of methods for the visualization and interactive visual analysis of this new high resolution brain network data, both in its matrix representation as well as in its anatomical context. We have implemented these methods in a GPU raycasting framework that enables real-time interaction, such as network probing and volume deformation, as well as real-time filtering. The techniques are integrated in a visual analysis application in which the different views are coupled, supporting linked interaction. Furthermore, we allow visual comparison of different brain networks with side-by-side and difference visualization. We have evaluated our approach via case studies with domain scientists at two different university medical centers. © The Eurographics Association 2012.

关键词： Visualization

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Engineering graphics literacy: Spatial visualization ability and students' ability to model objects from assembly drawing information

Engineering graphics literacy: Spatial visualization ability...

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119th ASEE Annual Conference and Exposition

作者： Branoff, Theodore J. Dobelis, Modris Department of Mathematics Science and Technology Education North Carolina State University United States Department of Computer Aided Engineering Graphics Riga Technical University Riga Latvia

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BurnAR: Feel the heat

BurnAR: Feel the heat

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11th IEEE and ACM International Symposium on Mixed and Augmented Reality, ISMAR 2012

作者： Weir, Peter Sandor, Christian Swoboda, Matt Nguyen, Thanh Eck, Ulrich Reitmayr, Gerhard Dey, Arindam Magic Vision Lab. University of South Australia Adelaide SA Australia Fairlight Graz University of Technology Graz Austria Institute of Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9781467346603

Augmented Reality systems that run interactively and in real time, using high quality graphical displays and sensational cues, can create the illusion of virtual objects appearing to be real. This paper presents the design and implementation of BurnAR, a demonstration which enables users to experience the illusion of seeing their own hands burning, which we achieve by overlaying virtual flames and smoke on their hands. Surprisingly, some users reported an involuntary warming sensation of their hands. © 2012 IEEE.

关键词： Smoke

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ONLINE MAPS and CLOUD-SUPPORTED LOCATION-BASED SERVICES ACROSS A MANIFOLD of DEVICES 22

ONLINE MAPS and CLOUD-SUPPORTED LOCATION-BASED SERVICES ACRO...

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22nd Congress of the International Society for Photogrammetry and Remote Sensing: Imaging a Sustainable Future, ISPRS 2012

作者： Kröpfl, M. Buchmüller, D. Leberl, F. Microsoft Corporation One Microsoft Way RedmondWA98052 United States Graz University of Technology Institute for Computer Graphics and Vision A-8010 Graz Austria Austria

Online mapping, miniaturization of computing devices, the "cloud", Global Navigation Satellite System (GNSS) and cell tower triangulation all coalesce into an entirely novel infrastructure for numerous innovative map applications. This impacts the planning of human activities, navigating and tracking these activities as they occur, and finally documenting their outcome for either a single user or a network of connected users in a larger context. In this paper, we provide an example of a simple geospatial application making use of this model, which we will use to explain the basic steps necessary to deploy an application involving a web service hosting geospatial information and a client software consuming the web service through an API. The application allows an insurance claim specialist to add claims to a cloud-based database including a claim location. A field agent then uses a smartphone application to query the database by proximity, and heads out to capture photographs as supporting documentation for the claim. Once the photos have been uploaded to the web service, a second web service for image matching is called in order to try and match the current photograph to previously submitted assets. Image matching is used as a pre-verification step to determine whether the coverage of the respective object is sufficient for the claim specialist to process the claim. The development of the application was based on Microsoft's® Bing Maps™, Windows Phone™, Silverlight™, Windows Azure™ and Visual Studio™, and was completed in approximately 30 labour hours split among two developers.

关键词： Aerial Cloud Computing Databases Georeferencing GIS Imagery Internet/Web LBS Mapping Matching Mobile/GPS/INS Web Services

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Evaluation of fast 2D and 3D medical image retrieval approaches based on image miniatures

Evaluation of fast 2D and 3D medical image retrieval approac...

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2nd MICCAI International Workshop on Medical Content-Based Retrieval for Clinical Decision Support, MCBR-CDS 2011

作者： Donner, René Haas, Sebastian Burner, Andreas Holzer, Markus Bischof, Horst Langs, Georg Computational Image Analysis and Radiology Lab. Department of Radiology Medical University of Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Austria Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA United States

ISBN: (纸本)9783642284595

The present work evaluates four medical image retrieval approaches based on features derived from image miniatures. We argue that due to the restricted domain of medical image data, the standardized acquisition protocols and the absence of a potentially cluttered background a holistic image description is sufficient to capture high-level image similarities. We compare four different miniature 2D and 3D descriptors and corresponding metrics, in terms of their retrieval performance: (A) plain miniatures together with euclidean distances in a k Nearest Neighbor based retrieval backed by kD-trees;(B) correlations of rigidly aligned miniatures, initialized using the kD-tree;(C) distribution fields together with the l1-norm;(D) SIFT-like histogram of gradients using the χ2-distance. We evaluate the approaches on two data sets: the ImageClef 2009 benchmark of 2D radiographs with the aim to categorize the images and a large set of 3D-CTs representing a realistic sample in a hospital PACS with the objective to estimate the location of the query volume. © 2012 Springer-Verlag.

关键词： Medical imaging

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Reliable adaptive modelling of vascular structures with non-circular cross-sections

Reliable adaptive modelling of vascular structures with non-...

引用

14th Eurographics Conference on Visualization 2012, EuroVis 2012

作者： Kretschmer, Jan Beck, Thomas Tietjen, Christian Preim, Bernhard Stamminger, Marc Computer Graphics Group University of Erlangen Germany Institute for Anthropomatics Karlsruhe Institute of Technology Germany Siemens Healthcare Sector Computed Tomography Forchheim Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany

Accurate visualizations of complex vascular structures are essential for medical applications, such as diagnosis, therapy planning and medical education. Vascular trees are usually described using centerlines, since they capture both the topology and the geometry of the vasculature in an intuitive manner. State-of-the-art vessel segmentation algorithms deliver vascular outlines as free-form contours along the centerline, since this allows capturing anatomical pathologies. However, existing methods for generating surface representations from centerlines can only cope with circular outlines. We present a novel model-based technique that is capable of generating intersection-free surfaces from centerlines with complex outlines. Vascular segments are described by local signed distance functions and combined using Boolean operations. An octree-based surface generation strategy automatically computes watertight, scale-adaptive meshes with a controllable quality. In contrast to other approaches, our method generates a reliable representation that guarantees to capture all vessels regardless of their size. © 2012 The Author(s).

关键词： Medical applications

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INCORPORATING AUDITORY PROPERTIES INTO GENERALISED SIDELOBE CANCELLER

INCORPORATING AUDITORY PROPERTIES INTO GENERALISED SIDELOBE ...

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European Signal Processing Conference

作者： Adam Borowicz Alexandr Petrovsky Bialystok University of Technology Department of Digital Media and Computer Graphics

ISBN: (纸本)9781467310680

A novel speech enhancement method based on generalized sidelobe canceller (GSC) and auditory properties is presented. We show that it is possible to reduce audible speech distortions and preserve residual noise level under system model uncertainties. It can be done by constraining a speech leakage power according to masking effect phenomena. An optimal noise cancellation filter is derived using constrained minimization of the residual noise power. We implemented the GSC structure using a simple delay-and-sum beamformer and corresponding (delays-dependent) blocking matrix. Finally a comparative evaluation of the selected methods is performed using objective speech quality measures. The results show that the novel method outperforms conventional one providing lower speech distortions and comparable noise attenuation.

关键词： GSC Speech enhancement Beamforming residual noise generalized sidelobe canceller noise attenuation Speech Noise cancellation GSC gene Speech enhancement

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