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检索条件"机构=Institute for Computer Science II - Computer Graphics"

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Variational optical flow from alternate exposure images

Variational optical flow from alternate exposure images

引用

14th International Conference on Vision, Modeling, and Visualization, VMV 2009

作者： Sellent, Anita Eisemann, Martin Goldlücke, Bastian Pock, Thomas Cremers, Daniel Magnor, Marcus Institut für Computergraphik TU Braunschweig Germany Department of Computer Science University of Bonn Germany Institute for Computer Graphics and Vision Graz University of Technology Austria

ISBN: (纸本)9783980487481

Traditional optic flow algorithms rely on consecutive short-exposure images. In contrast, longexposed images contain integrated motion information directly in form of motion blur. In this paper, we show how the additional information provided by a long exposure image can be used to improve robustness and accuracy of motion field estimation. Recently, an image formation model was introduced [23] that relates a long-exposure image to preceding and succeeding short-exposure images in terms of dense 2D motion and occlusion. We formulate the original two-step problem for motion and occlusion timings as a joint minimization problem and derive a global TV-L1 energy functional that can be minimized efficiently and accurately. The approach is able to calculate highly accurate motion fields, assigning motion to occluded and disoccluded image regions in one joint optimization procedure.

关键词： Optical flows

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Efficient real-time shadows 13

Efficient real-time shadows

引用

ACM Special Interest Group on computer graphics and Interactive Techniques Conference, SIGGRAPH 2013

作者： Eisemann, Elmar Assarsson, Ulf Schwarz, Michael Valient, Michal Wimmer, Michael Delft University of Technology Netherlands Department of Computer Science and Engineering Chalmers University Sweden Guerrilla Games / Sony Computer Entertainment Netherlands Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)9781450323390

This course provides an overview of efficient, real-time shadow algorithms. It presents the theoretical background but also discusses implementation details for facilitating efficient realizations (hard and soft shadows, volumetric shadows, reconstruction techniques). These elements are of relevance to both experts and practitioners. The course also reviews budget considerations and analyzes performance trade-offs, using examples from various AAA game titles and film previsualization tools. While physical accuracy can sometimes be replaced by plausible shadows, especially for games, film production requires more pecision, such as scalable solutions that can deal with highly detailed *** course builds upon earlier SIGGRAPH courses as well as the recent book Real-Time Shadows (A K Peters, 2011) by four of the instructors (due to its success, a second edition is planned for 2014). And with two instructors who have worked on AAA game and movie titles, the course presents interesting behindthe-scenes information that illuminates key topics.

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Automatic detection and recognition of engineered nanoparticles in SEM images

Automatic detection and recognition of engineered nanopartic...

引用

17th Annual Workshop on Vision, Modeling and Visualization, VMV 2012

作者： Kockentiedt, S. Toennies, K. Gierke, E. Dziurowitz, N. Thim, C. Plitzko, S. Department of Simulation and Graphics Faculty of Computer Science University of Magdeburg Germany Federal Institute for Occupational Safety and Health Germany

ISBN: (纸本)9783905673951

Engineered nanoparticles have gained importance in recent years and will do so in the future, but their potential toxicity remains an open question. To better understand their effects on the human body, it is necessary to determine their concentration in ambient air. We propose a method to automatically detect nanoparticles in SEM images and differentiate engineered particles from other particles common in ambient air. The method reached Gmeans of 0.985, 0.779 and 0.820 for the classification against non-engineered particles of silver, titanium dioxide and zinc oxide respectively. This is comparable to manual classification. © 2012 The Eurographics Association.

关键词： Nanoparticles

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Sketch-aided retrieval of incomplete 3D cultural heritage objects 12

Sketch-aided retrieval of incomplete 3D cultural heritage ob...

引用

12th Eurographics Workshop on 3D Object Retrieval, 3DOR 2019, in conjunction with the 40th Annual Conference of the European Association for computer graphics, EG 2019

作者： Lengauer, S. Komar, A. Labrada, A. Karl, S. Trinkl, E. Preiner, R. Bustos, B. Schreck, T. Institute of Computer Graphics and Knowledge Visualisation Graz University of Technology Austria Institute of Archaeology University of Graz Austria Millenium Institute for Foundational Research on Data Department of Computer Science University of Chile Chile

ISBN: (纸本)9783038680772

Due to advances in digitization technology, documentation efforts and digital library systems, increasingly large collections of visual Cultural Heritage (CH) object data becomes available, offering rich opportunities for domain analysis, e.g., for comparing, tracing and studying objects created over time. In principle, existing shape- and image-based similarity search methods can aid such domain analysis tasks. However, in practice, visual object data are given in different modalities, including 2D, 3D, sketches or conventional drawings like profile sections or unwrappings. In addition, collections may be distributed across different publications and repositories, posing a challenge for implementing encompassing search and analysis systems. We introduce a methodology and system for cross-modal visual search in CH object data. Specifically, we propose a new query modality based on 3D views enhanced by user sketches (3D+sketch). This allows for adding new context to the search, which is useful e.g., for searching based on incomplete query objects, or for testing hypotheses on existence of certain shapes in a collection. We present an appropriately designed workflow for constructing query views from incomplete 3D objects enhanced by a user sketch based on shape completion and texture inpainting. Visual cues additionally help users compare retrieved objects with the query. We apply our method on a set of relevant 3D and view-based CH object data, demonstrating the feasibility of our approach and its potential to support analysis of domain experts in Archaeology and the field of CH in general. © 2019 The Author(s)

关键词： Textures

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Visual Analysis of Urban Traffic Data based on High-Resolution and High-Dimensional Environmental Sensor Data 6

Visual Analysis of Urban Traffic Data based on High-Resoluti...

引用

6th Workshop on Visualisation in Environmental sciences, EnvirVis 2018 at EuroVis 2018

作者： Häußler, Johannes Stein, Manuel Seebacher, Daniel Janetzko, Halldor Schreck, Tobias Keim, Daniel A. University of Konstanz Department of Computer and Information Science Germany University of Zurich Department of Geography Switzerland Graz University of Technology Institute for Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038680635

Urbanization is an increasing global trend resulting in a strong increase in public and individual transportation needs. Accordingly, a major challenge for traffic and urban planners is the design of sustainable mobility concepts to maintain and increase the long-term health of humans by reducing environmental pollution. Recent developments in sensor technology allow the precise tracking of vehicle sensor information, allowing a closer and more in-depth analysis of traffic data. We propose a visual analytics system for the exploration of environmental factors in these high-resolution and high-dimensional mobility sensor data. Additionally, we introduce an interactive visual logging approach to enable experts to cope with complex interactive analysis processes and the problem of the reproducibility of results. The usefulness of our approach is demonstrated via two expert studies with two domain experts from the field of environment-related projects and urban traffic planning. © 2018 The Author(s) Eurographics Proceedings © 2018 The Eurographics Association.

关键词： computer graphics

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Motif-Driven retrieval of greek painted pottery

Motif-Driven retrieval of greek painted pottery

引用

2019 Eurographics Workshop on graphics and Cultural Heritage, GCH 2019

ISBN: (纸本)9783038680826

The analysis of painted pottery is instrumental for understanding ancient Greek society and human behavior of past cultures in Archaeology. A key part of this analysis is the discovery of cross references to establish links and correspondences. However, due to the vast amount of documented images and 3D scans of pottery objects in today's domain repositories, manual search is very time consuming. computer aided retrieval methods are of increasing importance. Mostly, current retrieval systems for this kind of cultural heritage data only allow to search for pottery of similar vessel's shape. However, in many cases important similarity cues are given by motifs painted on these vessels. We present an interactive retrieval system that makes use of this information to allow for a motif-driven search in cultural heritage repositories. We address the problem of unsupervised motif extraction for preprocessing and the shape-based similarity search for Greek painted pottery. Our experimental evaluation on relevant repository data demonstrates effectiveness of our approach on examples of different motifs of interests. © 2019 Eurographics Association.

关键词： Behavioral research

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Techniques for view transition in multi-camera outdoor environments

Techniques for view transition in multi-camera outdoor envir...

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36th graphics Interface Conference, GI 2010

作者： Veas, Eduardo Mulloni, Alessandro Kruijff, Ernst Regenbrecht, Holger Schmalstieg, Dieter Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Information Science University of Otago New Zealand

ISBN: (纸本)9781568817125

Environment monitoring using multiple observation cameras is increasingly popular. Different techniques exist to visualize the incoming video streams, but only few evaluations are available to find the best suitable one for a given task and context. This article compares three techniques for browsing video feeds from cameras that are located around the user in an unstructured manner. The techniques allow mobile users to gain extra information about the surroundings, the objects and the actors in the environment by observing a site from different perspectives. The techniques relate local and remote cameras topologically, via a tunnel, or via bird's eye viewpoint. Their common goal is to enhance spatial awareness of the viewer, without relying on a model or previous knowledge of the environment. We introduce several factors of spatial awareness inherent to multi-camera systems, and present a comparative evaluation of the proposed techniques with respect to spatial understanding and workload.

关键词： Cameras

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Free-Viewpoint Visual Inspection via 3D Gaussian Splatting for Direct Template Matching 50

Free-Viewpoint Visual Inspection via 3D Gaussian Splatting f...

引用

50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Ito, Kenta Ueda, Shiori Mori, Shohei Sugano, Junichi Adachi, Hideyuki Saito, Hideo Information and Computer Science Keio University Yokohama Japan Institute of Computer Graphics and Vision Graz University of Technology Graz Austria ViSCO Technologies Corporation Tokyo Japan

ISBN: (纸本)9781665464543

Machine vision systems play a pivotal role in streamlining manufacturing processes, notably in quality control through automatic in-line visual inspections. A common practice for inspecting parts, components, and final products is to use a master part benchmark for quality comparison. However, challenges arise when objects enter inspection points in unintended orientations. This misalignment potentially leads to erroneous decisions by automated systems, resulting in additional checkpoints or wastage affecting the production rate. To tackle this issue, we propose a visual inspection pipeline that leverages recent machine learning-based approaches to compare the inspection target and a master part virtually oriented to the same perspective. Specifically, we suggest combining 3D Gaussian Splatting and DUSt3R as a practical solution. Our approach demonstrates its efficacy in real-world scenarios through testing on three mock parts and a real industrial component. © 2024 IEEE.

关键词： Template matching

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Coating application method and calendering influence on the spatial coating layer formation obtained by an automated serical sectioning method

Coating application method and calendering influence on the ...

引用

2006 TAPPI Advanced Coating Fundamentals Symposium

作者： Wiltsche, M. Bauer, W. Donoser, M. Institute for Paper Pulp and Fiber Technology - IPZ Graz University of Technology Kopernikusgasse 24/II Austria Institute for Computer Graphics and Vision - ICG Graz University of Technology Inffeldgasse 16/II Austria

After an introduction to related research in the field of spatial coating layer formation, a new analysis method, based on a fully automated microtomy process and light microscopy combined with advanced image analysis algorithms, is presented. The concept offers both, a high spatial resolution and a significantly larger sample size than conventional SEM techniques. The concept is based on a light microscope which is attached to a rotary microtome. An embedded paper sample is digitized by means of serial sectioning. Repeatedly, slices are cut off the embedded paper sample and the cut block surface is scanned fully automated. Image analysis software was developed to automatically detect the coating layer. Segmentation of the coating layer is realized by a 3D color segmentation process in the RGB color space instead of a threshold based algorithm. The approach itself is a three-dimensional concept, meaning that for the detection of the coating layer in one slice image also data from the neighboring slices is incorporated. Thus, the algorithm delivers both, detailed and robust coating layer recognition. Single coated LWC papers from a pilot coater were analyzed to compare coating layer formation for blade and curtain coating. Local correlation was used to study the relation between the obtained thickness and topography values of the base paper and the coating layers for both coating methods. The results showed, as expected, in tendency a leveling coat behavior for blade coating and a contour coat behavior for curtain coating. However, especially the curtain coated sample, but also the blade coated sample, was away from the idealized characteristics of a contour or a leveling coat respectively. Studies regarding the effect of calendering on these samples showed that calendering predominantly influences the base sheet topography under the coating layer with a less pronounced effect on the coating layer thickness.

关键词： Coating techniques

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Surface membrane based bladder registration for evaluation of accumulated dose during brachytherapy in cervical cancer

Surface membrane based bladder registration for evaluation o...

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2011 8th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, ISBI'11

作者： Noe, Karsten Ø. Tanderup, Kari Sorensen, Thomas S. Computer Graphics Lab Alexandra Institute Denmark Department of Oncology Aarhus University Hospital Denmark Department of Computer Science Aarhus University Denmark Institute of Clinical Medicine Aarhus University Denmark

ISBN: (纸本)9781424441280

A new optimisation strategy for surface mesh registration is proposed based on energy minimisation of an elastic surface membrane. The energy term is evaluated in three-dimensional space, optimisation however is performed while constraining the moving surface to a parametrised spherical space of the fixed surface. Optional landmark based matches can be included in the suggested iterative solver. The technique is demonstrated for bladder registration in brachytherapy treatment evaluation of cervical cancer. It holds promise to better estimate the accumulated but unintentional dose delivered to organs at risk. © 2011 IEEE.

关键词： Radiotherapy

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