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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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Riemann-finsler multi-valued geodesic tractography for HARDI 4th

Riemann-finsler multi-valued geodesic tractography for HARDI

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4th Meeting on visualization and Processing of Tensors and Higher Order Descriptors for Multi-Valued Data, 2011

作者： Sepasian, Neda Ten Thije Boonkkamp, Jan H. M. Florack, Luc M. J. Ter Haar Romeny, Bart M. Vilanova, Anna Department of Biomedical Engineering Mathematics and Computer Science Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Mathematics and Computer Science Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Department of Biomedical Engineering Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Faculty Electrical Engineering Mathematics and Computer Science Computer Graphics and Visualization Delft University of Technology Delft Netherlands

ISBN: (纸本)9783642543005

We introduce a geodesic based tractography method for High Angular Resolution Diffusion Imaging (HARDI). The concepts used are similar to the ones in geodesic based tractography for Diffusion Tensor Imaging (DTI). In DTI, the inverse of the second-order diffusion tensor is used to define the manifold where the geodesics are traced. HARDI models have been developed to resolve complex fiber populations within a voxel, and higher order tensors (HOT) are possible representations for HARDI data. In our framework, we apply Finsler geometry, which extends Riemannian geometry to a directionally dependent metric. A Finsler metric is defined in terms of HARDI higher order tensors. Furthermore, the Euler-Lagrange geodesic equations are derived based on the Finsler geometry. In contrast to other geodesic based tractography algorithms, the multi-valued numerical solution of the geodesic equations can be obtained. This gives the possibility to capture all geodesics arriving at a single voxel instead of only computing the shortest one. Results are analyzed to show the potential and characteristics of our algorithm. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Diffusion tensor imaging

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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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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Automating interface evaluation 94

Automating interface evaluation

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Conference Companion on Human Factors in Computing Systems

作者： Michael D. Byrne D. Wood Piyawadee Sukaviriya James D. Foley David Kieras Graphics Visualization and Usabitity Center Georgia Institute of Technology Atlanta GA Electrical Engineering and Computer Science Department University of Michigan Ann Arbor MI

No abstract available.

ISBN: (纸本)9780897916516

No abstract available.

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Head-tracked orbital viewing: an interaction technique for immersive virtual environments 96

Head-tracked orbital viewing: an interaction technique for i...

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Proceedings of the 9th annual ACM symposium on User interface software and technology

作者： David R. Koller Mark R. Mine Scott E. Hudson Graphics Visualization & Usability Center College of Comuputing Georgia Institute of Technology Atlanta GA Department of Computer Science University of North Carolira Chapel Hill NC

No abstract available.

ISBN: (纸本)9780897917988

No abstract available.

关键词： interaction metaphors head-tracking viewpoint selection steering virtual environments

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Anisotropic range image integration

Anisotropic range image integration

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Joint 34th Symposium of the German Association for Pattern Recognition, DAGM 2012 and 36th Symposium of the Austrian Association for Pattern Recognition, OAGM 2012

作者： Schroers, Christopher Zimmer, Henning Valgaerts, Levi Bruhn, Andrés Demetz, Oliver Weickert, Joachim Mathematical Image Analysis Group Faculty of Mathematics and Computer Science Saarland University Saarbrücken 66041 Germany Computer Graphics Laboratory Department of Computer Science ETH Zurich Zurich 8092 Switzerland Max-Planck-Institut für Informatik Campus E1.4 Saarbrücken 66123 Germany Institute for Visualization and Interactive Systems University of Stuttgart Universitätsstraße 38 70569 Stuttgart Germany

ISBN: (纸本)9783642327162

Obtaining high-quality 3D models of real world objects is an important task in computer vision. A very promising approach to achieve this is given by variational range image integration methods: They are able to deal with a substantial amount of noise and outliers, while regularising and thus creating smooth surfaces at the same time. Our paper extends the state-of-the-art approach of Zach et al.(2007) in several ways: (i) We replace the isotropic space-variant smoothing behaviour by an anisotropic (direction-dependent) one. Due to the directional adaptation, a better control of the smoothing with respect to the local structure of the signed distance field can be achieved. (ii) In order to keep data and smoothness term in balance, a normalisation factor is introduced. As a result, oversmoothing of locations that are seen seldom is prevented. This allows high quality reconstructions in uncontrolled capture setups, where the camera positions are unevenly distributed around an object. (iii) Finally, we use the more accurate closest signed distances instead of directional signed distances when converting range images into 3D signed distance fields. Experiments demonstrate that each of our three contributions leads to clearly visible improvements in the reconstruction quality. © 2012 Springer-Verlag.

关键词： computer vision

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A Streamline-guided De-Homogenization Approach for Structural Design

arXiv

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arXiv 2022年

作者： Wang, Junpeng Westermann, Rüdiger Wu, Jun Computer Graphics and Visualization Department of Informatics Technical University of Munich Garching 85748 Germany Department of Sustainable Design Engineering Delft University of Technology Delft2628 CE Netherlands

We present a novel de-homogenization approach for efficient design of high-resolution load-bearing structures. The proposed approach builds upon a streamline-based parametrization of the design domain, using a set of space-filling and evenly-spaced streamlines in the two mutually orthogonal direction fields that are obtained from homogenization-based topology optimization. Streamlines in these fields are converted into a graph, which is then used to construct a quad-dominant mesh whose edges follow the direction fields. In addition, the edge width is adjusted according to the density and anisotropy of the optimized orthotropic cells. In a number of numerical examples, we demonstrate the mechanical performance and regular appearance of the resulting structural designs, and compare them with those from classic and contemporary approaches. Copyright © 2022, The Authors. All rights reserved.

关键词： Structural design

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Image plane interaction techniques in 3D immersive environments 97

Image plane interaction techniques in 3D immersive environme...

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Proceedings of the 1997 symposium on Interactive 3D graphics

作者： Jeffrey S. Pierce Andrew S. Forsberg Matthew J. Conway Seung Hong Robert C. Zeleznik Mark R. Mine Department of Computer Science University of Virginia Charlottesville VA Brown University site of the NSF Science and Technology Center for Computer Graphics and Scientific Visualization Providence RI Department of Computer Science University of North Carolina Chapel Hill NC

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Integrating visualization support into distributed computing systems

Integrating visualization support into distributed computing...

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International Conference on Distributed Computing Systems

作者： B. Topol J.T. Stasko V. Sunderam Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA USA Department of Math and computer Science Emory University Atlanta GA USA

visualization and animation tools may become extremely important aids in the understanding, verification, and performance tuning of parallel computations. Presently, however, the use of visualization has had only a limited use for enhancing parallel computation. We hypothesize that one of the primary reasons for the limited use of visualization tools in parallel program development is the difficulty of acquiring the information necessary to drive the visual display. Our approach to this impediment focuses on integrating visualization support directly into a distributed computing system. Central to this integration is the addition of a logical clock that prevents the timestamps of events from violating causality. The implementation requires the "piggybacking" of a negligible amount of extra header information on system messages and the impact on performance is minimal. This results in a system that produces useful visualizations with no extra effort required by the applications programmer. Also integrated into the distributed system is support which simplifies the creation of programmer-defined, application-specific visualizations, unique to each new parallel program developed.

关键词： visualization Distributed computing Concurrent computing Animation Drives Displays Impedance Clocks Programming profession

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