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IEEE International Workshop on Higher-Level Knowledge in 3D Modeling and Motion Analysis (HLK)

作者： K. Schindler J. Bauer Computer Graphics and Vision Graz University of Technology Graz Austria VRVis Research Center for Virtual Reality and Visualization Graz Austria

Model-based reconstruction methods are applied to the detailed reconstruction of buildings from close-range images. The 3D points obtained through image matching are segmented into a coarse polyhedral model with a robust regression algorithm, then the geometry of this model is refined with predefined shape templates in order to automatically recover a CAD-like model of the building surface. Reprojection of the 3D shape templates is used to optimally fit their parameters to the image information. Throughout the paper the investigated methods are demonstrated on real datasets.

关键词： Solid modeling Image reconstruction Shape Reconstruction algorithms Image matching Image segmentation Robustness Geometry Surface fitting Surface reconstruction

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Advanced curved planar reformation: flattening of vascular structures

Advanced curved planar reformation: flattening of vascular s...

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IEEE Conference on Visualization

作者： A. Kanitsar R. Wegenkittl D. Fleischmann M.E. Groller Institute of Computer Graphics and Algorithms University of Technology Vienna Austria TIANI Medgraph Austria Department of Radiology University of Stanford USA

Traditional volume visualization techniques may provide incomplete clinical information needed for applications in medical visualization. In the area of vascular visualization important features such as the lumen of a diseased vessel segment may not be visible. Curved planar reformation (CPR) has proven to be an acceptable practical solution. Existing CPR techniques, however, still have diagnostically relevant limitations. In this paper, we introduce two advances methods for efficient vessel visualization, based on the concept of CPR. Both methods benefit from relaxation of spatial coherence in favor of improved feature perception. We present a new technique to visualize the interior of a vessel in a single image. A vessel is resampled along a spiral around its central axis. The helical spiral depicts the vessel volume. Furthermore, a method to display an entire vascular tree without mutually occluding vessels is presented. Minimal rotations at the bifurcations avoid occlusions. For each viewing direction the entire vessel structure is visible.

关键词： Computed tomography Arteries Magnetic resonance imaging Displays Angiography Data visualization Tree graphs Biomedical imaging Medical diagnostic imaging Spatial coherence

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Augmented reality for enhancement of endoscopic interventions

Augmented reality for enhancement of endoscopic intervention...

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IEEE Annual International Symposium Virtual Reality

作者： U. Bockholt A. Bisler M. Becker W. Muller-Wittig G. Voss Department Visualization & Virtual Reality Fraunhofer Institute for Computer Graphics Darmstadt Germany Centre for Advanced Media Technology (CAMTech) Singapore

computer assisted operation planning systems win more and more recognition in the field of surgery. These systems offer new possibilities to prepare an intervention with the goal to shorten the expansive time in the operation room required for the intervention. The safest and most effective surgical approach should be selected. But often, it is difficult to transfer the output of the planning system to the intra-operative situation and so to consider the planning results in the real intervention. At the Fraunhofer Institute for computer graphics (IGD) in Darmstadt and the Centre for Advanced Media technology (CAMTech) in Singapore, methods are developed to bridge the gap between the external planning session and the intra-operative case: augmented reality (AR) techniques are used to overlap preoperative scanned image data as well as results of the planning session to the operation field.

关键词： Augmented reality Orthopedic surgery Biomedical imaging Neurosurgery Displays technology planning Shape Biological tissues Deformable models Endoscopes

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The virtual showcase as a new platform for augmented reality digital storytelling 03

The virtual showcase as a new platform for augmented reality...

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Proceedings of the workshop on Virtual environments 2003

作者： Oliver Bimber L. Miguel Encarnação Dieter Schmalstieg Bauhaus University Weimar Germany Fraunhofer Center for Research in Computer Graphics (CRCG) Providence RI Vienna University of Technology Vienna Austria

ISBN: (纸本)9781581136869

In this paper we discuss a case study for which we applied a customized augmented reality display -the Virtual Showcase- as a new platform for digital storytelling. Different storytelling components are identified and examples for their specific realization are explained. Our case study focuses on communicating scientific information to a novice audience in a museum context. Addressing first user feedback, we describe our current efforts of improvement.

关键词： augmented reality digital storytelling multi-user user feedback

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Communication via eye blinks and eyebrow raises: Video-based human-computer interfaces

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Universal Access in the Information Society 2003年第4期2卷 359-373页

作者： Grauman, K. Betke, M. Lombardi, J. Gips, J. Bradski, G.R. Vision Interface Group AI Laboratory Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Computer Science Department Boston University 111 Cummington St BostonMA02215 United States EagleEyes Computer Science Department Boston College Fulton Hall Chestnut HillMA02467 United States Vision Graphics and Pattern Recognition Microcomputer Research Laboratory Intel Corporation SC12-303 2200 Mission College Blvd Santa ClaraCA95054-1537 United States

Two video-based human-computer interaction tools are introduced that can activate a binary switch and issue a selection command. "BlinkLink," as the first tool is called, automatically detects a user's eye blinks and accurately measures their durations. The system is intended to provide an alternate input modality to allow people with severe disabilities to access a computer. Voluntary long blinks trigger mouse clicks, while involuntary short blinks are ignored. The system enables communication using "blink patterns:" sequences of long and short blinks which are interpreted as semiotic messages. The second tool, "EyebrowClicker," automatically detects when a user raises his or her eyebrows and then triggers a mouse click. Both systems can initialize themselves, track the eyes at frame rate, and recover in the event of errors. No special lighting is required. The systems have been tested with interactive games and a spelling program. Results demonstrate overall detection accuracy of 95.6% for BlinkLink and 89.0% for EyebrowClicker. © Springer-Verlag 2003.

关键词： computer vision

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Visualization of noisy and biased volume data using first and second order derivative techniques

Visualization of noisy and biased volume data using first an...

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IEEE Conference on Visualization

作者： M.P. Persoon I.W.O. Serlie F.H. Post R. Truyen F.M. Vos Medical IT-Advanced Development Philips Medical Systems B.V. USA Computer Graphics and CAD/CAM Group Pattern Recognition Group Delft University of Technology Delft Netherlands Pattern Recognition Group Delft University of Technology Netherlands Computer Graphics and CAD/CAM Group Delft University of Technology Netherlands Department of Radiology Academic Medical Center Amsterdam Netherlands

The quality of volume visualization depends strongly on the quality of the underlying data. In virtual colonoscopy, CT data should be acquired at a low radiation dose that results in a low signal-to-noise ratio. Alternatively, MRI data is acquired without ionizing radiation, but suffers from noise and bias (global signal fluctuations). Current volume visualization techniques often do not produce good results with noisy or biased data. This paper describes methods for volume visualization that deal with these imperfections. The techniques are based on specially adapted edge detectors using first and second order derivative filters. The filtering is integrated into the visualization process. The first order derivative method results in good quality images but suffers from localization bias. The second order method has better surface localization, especially in highly curved areas. It guarantees minimal detail smoothing resulting in a better visualization of polyps.

关键词： Data visualization Image edge detection Virtual colonoscopy Computed tomography Signal to noise ratio Magnetic resonance imaging Ionizing radiation Fluctuations Detectors Filters

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Statistical diagnosis for intermittent scan chain hold-time fault

Statistical diagnosis for intermittent scan chain hold-time ...

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IEEE International Test Conference

作者： Yu Huang Wu-Tung Cheng S.M. Reddy Cheng-Ju Hsieh Yu-Ting Hung Mentor Graphics Corporation Wilsonville OR USA Department of Electrical & Computer Engineering University of Iowa Iowa IA USA Diagnosis Technique & Design Development Division Faraday Technology Corporation Taiwan

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On compacting test response data containing unknown values 03

On compacting test response data containing unknown values

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IEEE International Conference on computer-Aided Design

作者： Chen Wang S.M. Reddy I. Pomeranz J. Rajski J. Tyszer Mentor Graphics Corporation Wilsonville OR USA Elec. & Computer Engineering Department University of Iowa Iowa IA USA School of Elec. & Computer Engineering Purdue University West Lafayette IN USA Poznan University of Technology Poznan Poland

ISBN: (纸本)9781581137620

The design of a test response compactor called a Block Compactor is given. Block Compactors belong to a new class of compactors called Finite Memory Compactors. Different from space compactors, finite memory compactors contain memory elements. Also unlike time compactors, finite memory compactors have finite impulse response. These properties give finite memory compactors the ability to achieve higher compaction ratios than space compactors and still be able to tolerate unknown values in test responses. The proposed Block Compactors, as an instance of finite memory compactors generate a signature of response data in several scan cycles. Results presented on several industrial designs show that Block Compactors provide better test quality and higher data compaction than earlier works on test response compactors.

关键词： Circuit testing Compaction Parity check codes Space technology Fault detection Permission Block codes graphics Cities and towns Manufacturing industries

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Shape-based detection of humans for video surveillance applications

Shape-based detection of humans for video surveillance appli...

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IEEE International Conference on Image Processing

作者： H. Ramoser T. Schlogl C. Beleznai M. Winter H. Bischof Advanced Computer Vision GmbH Vienna Austria Siemens AG ÖOsterreich Programm-und Systementwicklung Graz Austria Siemens AG Österreich Programm- und Systementwicklung Graz Austria Institute for Computer Graphics and Vision Univ. of Technology Graz Austria

In this paper we describe a surveillance system that is not only able to detect blobs and track them but also determines if a blob is a person. The given blob is segmented into sub-regions. A person model is fit to these regions such that a likelihood measure is maximized. The likelihood measure depends on the number of identified body parts, their length, location, and aspect ratio. The method is translation, rotation, and scale invariant and computationally efficient. The results obtained for test video sequences are very encouraging.

关键词： Humans Video surveillance Application software Video sequences Shape measurement computer vision Testing Cameras Layout Fitting

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Shape Intrinsic Properties for Free-Form Object Matching

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Journal of Computing and Information Science in Engineering 2003年第4期3卷 325-333页

作者： Ko, K. H. Maekawa, T. Patrikalakis, N. M. Masuda, H. Wolter, F.-E. Massachusetts Institute of Technology Cambridge MA 02139 USA Yokohama National University Yokohama Japan The University of Tokyo Research into Artifacts Center for Engineering Tokyo 157-8904 Japan University of Hannover Division of Computer Graphics and Geometric Modeling D-30167 Hannover Germany

Despite extensive research and rapid increase of computing power, free-form object matching still remains a challenging problem in CAD/CAM areas. In this paper, various object features are discussed, and matching methods which use these features are introduced along with robust computational algorithms for umbilical points and intrinsic wireframes. The similarity of matched objects is assessed with three proposed tests. Each algorithm is demonstrated with examples.

关键词： design engineering Solids Shapes CAD/CAM computer-aided design Algorithms

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