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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Jörg-Stefan Praßni Timo Ropinski Jörg Mensmann Klaus Hinrichs Westfalische Wilhelms-Universitat Munster Munster Nordrhein-Westfalen DE Visualization and Computer Graphics Research Group (VisCG) University of Münster Germany

ISBN: (纸本)9781424466856

We present a novel classification technique for volume visualization that takes the shape of volumetric features into account. The presented technique enables the user to distinguish features based on their 3D shape and to assign individual optical properties to these. Based on a rough pre-segmentation that can be done by windowing, we exploit the curve-skeleton of each volumetric structure in order to derive a shape descriptor similar to those used in current shape recognition algorithms. The shape descriptor distinguishes three main shape classes: longitudinal, surface-like, and blobby shapes. In contrast to previous approaches, the classification is not performed on a per-voxel level but assigns a uniform shape descriptor to each feature and therefore allows a more intuitive user interface for the assignment of optical properties. By using the proposed technique, it becomes for instance possible to distinguish blobby heart structures filled with contrast agents from potentially occluding vessels and rib bones. After introducing the basic concepts, we show how the presented technique performs on real world data, and we discuss current limitations.

关键词： Transfer functions visualization Shape User interfaces computer graphics Bones Multidimensional systems Rough surfaces Surface roughness Heart

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Viargo - A generic virtual reality interaction library

Viargo - A generic virtual reality interaction library

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Workshop on Software Engineering and Architectures for Realtime Interactive Systems (SEARIS)

作者： Dimitar Valkov Benjamin Bolte Gerd Bruder Frank Steinicke Visualization and Computer Graphics (VisCG) Research Group University of Münster Germany Immersive Media Group (IMG) University of Würzburg Germany

Traditionally, interaction techniques for virtual reality applications are implemented in a proprietary way on specific target platforms, e. g., requiring specific hardware, physics or rendering libraries, which withholds reusability and portability. Though hardware abstraction layers for numerous devices are provided by multiple virtual reality libraries, they are usually tightly bound to a particular rendering environment. In this paper we introduce Viargo - a generic virtual reality interaction library, which serves as additional software layer that is independent from the application and its linked libraries, i. e., a once developed interaction technique, such as walking with a head-mounted display or multi-touch interaction, can be ported to different hard- or software environments with minimal code adaptation. We describe the underlying concepts and present examples on how to integrate Viargo in different graphics engines, thus extending proprietary graphics libraries with a few lines of code to easy-to-use virtual reality engines.

关键词： Engines Rendering (computer graphics) Cameras Libraries Hardware Synchronization

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Surface reconstruction with higher-order smoothness

arXiv

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arXiv 2017年

作者： Pan, Rongjiang Skala, Vaclav School of Computer Science and Technology Shandong University Jinan250100 China Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Plzen Czech Republic

This work proposes a method to reconstruct surfaces with higher-order smoothness from noisy 3D measurements. The reconstructed surface is implicitly represented by the zero level-set of a continuous valued embedding function. The key idea is to find a function whose higher-order derivatives are regularized and whose gradient is best aligned with a vector field defined by the input point set. In contrast to methods based on the first-order variation of the function that are biased towards the constant functions and treat the extraction of the isosurface without aliasing artifacts as an afterthought, we impose higher-order smoothness directly on the embedding function. After solving a convex optimization problem with a multi-scale iterative scheme, a triangulated surface can be extracted using the marching cubes algorithm. We demonstrated the proposed method on several data sets obtained from raw laser-scanners and multi-view stereo approaches. Experimental results confirm that our approach allows us to reconstruct smooth surfaces from points in the presence of noise, outliers, large missing parts and very coarse orientation information. Copyright © 2017, The Authors. All rights reserved.

关键词： Convex optimization

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On-Line Reconstruction of CAD Geometry

On-Line Reconstruction of CAD Geometry

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International Conference on 3D Imaging, Modeling, Processing, visualization and Transmission (3DIMPVT)

作者： Klaus Denker Daniel Hagel Jakob Raible Georg Umlauf Bernd Hamann Computer Graphics Laboratory Department of Computer Science Konstanz University of Applied Sciences Konstanz Germany Institute for Data Analysis and Visualization Department of Computer Science University of California Davis CA USA

In reverse engineering and computer-aided design (CAD) applications point cloud data is usually manually scanned, reconstructed, and post-processed in separated steps. When point cloud data resulting from a scanning process do not satisfy certain necessary reconstruction requirements, one must perform scanning again to enable proper reconstruction. On-line reconstruction of 3d geometry allows one to generate and update a CAD reconstruction on-line during the scanning process with an hand-held laser scanner. Thus, regions where the scanned data is insufficient for the reconstruction are detected on the fly to allow an immediate correction and improvement of the scanned data. This enables the operator to focus on critical regions in the scanned data to improve the reconstruction quality. We present an on-line segmentation and on-line reconstruction of basic geometric primitives. The presented methods allow for a real-time processing of a point stream. They utilize data structures that can be updated at any time when additional data from the stream has to be processed. This data is used to complete and improve the segmentation and reconstruction during the scanning process.

关键词： Surface reconstruction Geometry Image reconstruction Shape Lasers Design automation Image segmentation

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Structure-aware shape processing 13

Structure-aware shape processing

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SIGGRAPH Asia 2013 Courses, SA 2013

作者： Mitra, Niloy J. Wand, Michael Zhang, Hao Cohen-Or, Daniel Kim, Vladimir Huang, Qi-Xing United Kingdom Max-Planck Institut Informatik Saarland University Germany Graphics Usability and Visualization Lab Simon Fraser University Canada TAU United States School of Computing Science United States Stanford Univ. United States Computer Science Department Princeton University United States Department Computer Science Stanford University United States

ISBN: (纸本)9781450326315

Shape structure is about the arrangement and relations between shape parts. Structure-aware shape processing goes beyond local geometry and low level processing, and analyzes and processes shapes at a high level. It focuses more on the global inter and intra semantic relations among the parts of shape rather than on their local geometry. With recent developments in easy shape acquisition, access to vast repositories of 3D models, and simple-to-use desktop fabrication possibilities, the study of structure in shapes has become a central research topic in shape analysis, editing, and modeling. A whole new line of structure-aware shape processing algorithms has emerged that base their operation on an attempt to understand such structure in shapes. The algorithms broadly consist of two key phases: an analysis phase, which extracts structural information from input data;and a (smart) processing phase, which utilizes the extracted information for exploration, editing, and synthesis of novel shapes. In this survey paper, we organize, summarize, and present the key concepts and methodological approaches towards efficient structure-aware shape processing. We discuss common models of structure, their implementation in terms of mathematical formalism and algorithms, and explain the key principles in the context of a number of state-of-the-art approaches. Further, we attempt to list the key open problems and challenges, both at the technical and at the conceptual level, to make it easier for new researchers to better explore and contribute to this topic. Our goal is to both give the practitioner an overview of available structure-aware shape processing techniques, as well as identify future research questions in this important, emerging, and fascinating research area.

关键词： Semantics

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Noise cancellation frontends for automatic meeting transcription

Noise cancellation frontends for automatic meeting transcrip...

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6th European Conference on Noise Control: Advanced Solutions for Noise Control, EURONOISE 2006

作者： Képesi, Marián Van Pham, Tuan Kubin, Gernot Weruaga, Luis Juffinger, Andreas Grabner, Michael Signal Processing and Speech Communication Laboratory Graz University of Technology Inffeldgasse 8010 Graz Austria Commission for Scientific Visualization Austrian Academy of Sciences Donau-City Strasse 1 Vienna Austria Institute for Theoretical Computer Science Graz University of Technology Inffeldgasse 8010 Graz Austria Institute for Computer Graphics Graz University of Technology Inffeldgasse 8010 Graz Austria

One research direction to make computers become more active machines is to use audio input with far-field omni-directional microphones, these being required to face the acoustics problem of the meeting scenario. This topic is not only interesting from an artificial listener point-of-view, but also as one of the hottest topics in searchable media. In this paper two noise suppression methods for real meeting audio are evaluated. Because of the usage of hands-free microphones in a meeting environment, the reverberation of meeting rooms and background noise sources such as projector, computer fan have huge impact on speech quality. Two denoising methods, based on statistical Wavelet filtration and short-time Fourier transform are discussed and evaluated. Whilst the quantile technique is suitable for estimating stationary noise (beamer, computer fan), non-stationary sources (closing door, chair movement) can be handled by recursive structure and adaptive temporal gain of the statistical filtration method. Besides, frequency non-linear gain can remove colored noise effectively. The proposed noise reduction methods are evaluated with speaker localizing application applied on the meeting database of the Mistral project. The results show the pros and cons of each method applied on the meeting database.

关键词： Microphones

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Next-generation 3D visualization for visual surveillance

Next-generation 3D visualization for visual surveillance

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

作者： Peter M. Roth Volker Settgast Peter Widhalm Marcel Lancelle Josef Birchbauer Norbert Brändle Sven Havemann Horst Bischof Graz University of Technology Institute for Computer Graphics and Vision Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austrian Institute of Technology Dynamic Transportation Systems Siemens AG Österreich Corporate Technology (CT T CEE) Austria

Existing visual surveillance systems typically require that human operators observe video streams from different cameras, which becomes infeasible if the number of observed cameras is ever increasing. In this paper, we present a new surveillance system that combines automatic video analysis (i.e., single person tracking and crowd analysis) and interactive visualization. Our novel visualization takes advantage of a high resolution display and given 3D information to focus the operator's attention to interesting/ critical areas of the observed area. This is realized by embedding the results of automatic scene analysis techniques into the visualization. By providing different visualization modes, the user can easily switch between the different modes and can select the mode which provides most information. The system is demonstrated for a real setup on a university campus.

关键词： Cameras Three dimensional displays visualization Surveillance Solid modeling Trajectory

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Precise Registration of 3D Models To Images by Swarming Particles

Precise Registration of 3D Models To Images by Swarming Part...

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： Joerg Liebelt Klaus Schertler Computer Graphics & Visualization Group Technical University Munich Munich Germany Department IW-SI EADS Innovation Works Germany Munich Germany

The precise alignment of a 3D model to 2D sensor images to recover the pose of an object in a scene is an important topic in computer vision. In this work, we outline a registration scheme to align arbitrary standard 3D models to optical and synthetic aperture radar (SAR) images in order to recover the full 6 degrees of freedom of the object. We propose a novel similarity measure which combines perspective contour matching and an appearance-based Mutual information (MI) measure. Unlike previous work, the resulting similarity measure is optimized using an evolutionary particle swarming strategy, parallelized to exploit the hardware acceleration potential of current generation graphics processors (GPUs). The performance of our registration scheme is systematically evaluated on an object tracking task using synthetic as well as real input images. We show that our approach leads to precise registration results, even for significant image noise, small object dimensions and partial occlusion where other methods would fail.

关键词： Image sensors Layout computer vision Adaptive optics Laser radar Optical sensors Synthetic aperture radar Mutual information Current measurement Particle measurements

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A comparison of rendering techniques for large 3D line sets with transparency

arXiv

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arXiv 2019年

作者： Kern, Michael Neuhauser, Christoph Maack, Torben Han, Mengjiao Usher, Will Westermann, Rüdiger Computer Graphics & Visualization Group Technische Universität München Garching Germany Scientific Computing and Imaging Institute University of Utah United States

This paper presents a comprehensive study of interactive rendering techniques for large 3D line sets with transparency. The rendering of transparent lines is widely used for visualizing trajectories of tracer particles in flow fields. Transparency is then used to fade out lines deemed unimportant, based on, for instance, geometric properties or attributes defined along them. Since accurate blending of transparent lines requires rendering the lines in back-to-front or front-to-back order, enforcing this order for 3D line sets with tens or even hundreds of thousands of elements becomes challenging. In this paper, we study CPU and GPU rendering techniques for large transparent 3D line sets. We compare accurate and approximate techniques using optimized implementations and a number of benchmark data sets. We discuss the effects of data size and transparency on quality, performance and memory consumption. Based on our study, we propose two improvements to per-pixel fragment lists and multi-layer alpha blending. The first improves the rendering speed via an improved GPU sorting operation, and the second improves rendering quality via a transparency-based bucketing. Copyright © 2019, The Authors. All rights reserved.

关键词： Transparency

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Collaborative Factory Planning in Virtual Reality

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Procedia CIRP 2012年 3卷 317-322页

作者： N. Menck X. Yang C. Weidig P. Winkes C. Lauer H. Hagen B. Hamann J.C. Aurich Institute for Manufacturing Technology and Production Systems (FBK) 67653 Kaiserslautern Germany Computer Graphics and HCI Group 67653 Kaiserslautern Germany Institute for Data Analysis and Visualization (IDAV) Davis 95616-8562 USA

The competitive development and optimization of manufacturing systems challenge the collaboration and innovation of enterprises. Different information, thinking, and points of view have to be exchanged across engineering, decision-making, and executive levels safely and effectively. The Virtual Reality (VR) technologies provide the users advanced Human-computer-Interfaces for designing, analyzing, and optimizing complex manufacturing systems. The objective of this paper is to describe a VR-based approach that allows the simultaneous visualization, investigation, and analysis for factory planning. This gives global entities a competitive advantage when conducting business.

关键词： Distance Collaboration Factory Planning Virtual Reality

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