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11th ACM SIGGRAPH / Eurographics Symposium on computer Animation, SCA 2012

作者： Vögele, Anna Hermann, Max Krüger, Björn Klein, Reinhard Bonn University Institute of Computer Science II Computer Graphics Germany

ISBN: (纸本)9783905674378

Creating geometrically detailed mesh animations is an involved and resource-intensive process in digital content creation. In this work we present a method to rapidly combine available sparse motion capture data with existing mesh sequences to produce a large variety of new animations. The key idea is to model shape changes correlated to the pose of the animated object via a part-based statistical shape model. We observe that compact linear models suffice for a segmentation into nearly rigid parts. The same segmentation further guides the parameterization of the pose which is learned in conjunction with the marker movement. Besides the inherent high geometric detail, further benefits of the presented method arise from its robustness against errors in segmentation and pose parameterization. Due to efficiency of both learning and synthesis phase, our model allows to interactively steer virtual avatars based on few markers extracted from video data or input devices like the Kinect sensor. © The Eurographics Association 2012.

关键词： Animation

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Behind Livia's villa: A case study for the devolution of large scale interactive "in-site" to "on-line" application

Behind Livia's villa: A case study for the devolution of lar...

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2nd International Conference on Design, User Experience, and Usability: Web, Mobile, and Product Design, DUXU 2013, Held as Part of 15th International Conference on Human-computer Interaction, HCI International 2013

作者： Lucci Baldassari, Guido Demetrescu, Emanuel Pescarin, Sofia Eriksson, Joakim Graf, Holger Virtual Heritage Lab CNR-ITABC Via Salaria Monterotondo St. Rome Italy Department of Design Science Lund University Sölvegatan 26 22100 Lund Sweden Fraunhofer Institute for Computer Graphics Fraunhoferstr. 5 64283 Darmstadt Germany

ISBN: (纸本)9783642392528

This work presents a methodology for designing online web presentations reusing a large scale, interactive and immersive VR installation by mapping assets as well as interactions to a low capability environment. With the emergence of WebGL plugin-free interactive 3D graphics inside limited information processing environments, e.g. browser technologies, becomes reality. However, macro VR worlds typically use large or even out-of-core data sets in order to produce and communicate scientifically relevant content. The major challenge still remains on how we can redesign and optimize applications that have been planned for macro VR worlds and map those to adequate concepts of micro scale worlds. We showcase this in the area of virtual archaeology for the online virtual museum of "Villa Di Livia", part of the bigger project "Flaminia Reloaded", in which several limitations could become crucial. The elaborated workflow could easily be adopted by other VMs and assist in future migrations. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Browser Technology Virtual Museums (VM) Desktop VR X3D

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Nonlinear Federated Filtering

Nonlinear Federated Filtering

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International Conference on Information Fusion

作者： Benjamin Noack Simon J. Julier Marc Reinhardt Uwe D. Hanebeck Intelligent Sensor-Actuator-Systems Laboratory (ISAS) Institute for Anthropomatics Karlsruhe Institute of Technology (KIT) Virtual Environments and Computer Graphics Group (VECG) Department of Computer Science University College London (UCL)

ISBN: (纸本)9781479902842

The federated Kalman filter embodies an efficient and easy-to-implement solution for linear distributed estimation problems. Data from independent sensors can be processed locally and in parallel on different nodes without running the risk of erroneously ignoring possible dependencies. The underlying idea is to counteract the common process noise issue by inflating the joint process noise matrix. In this paper, the same trick is generalized to nonlinear models and non-Gaussian process noise. The probability density of the joint process noise is split into an exponential mixture of transition densities. By this means, the process noise is modeled to independently affect the local system models. The estimation results provided by the sensor devices can then be fused, just as if they were indeed independent.

关键词： Federated Kalman Filter Nonlinear Estimation Distributed Estimation

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Theta-3 is connected 25

Theta-3 is connected

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25th Canadian Conference on Computational Geometry, CCCG 2013

作者： Aichholzer, Oswin Bae, Sang Won Barba, Luis Bose, Prosenjit Korman, Matias Van Renssen, André Taslakian, Perouz Verdonschot, Sander Institute for Software Technology Graz University of Technology Austria Department of Computer Science Kyonggi University Korea Republic of School of Computer Science Carleton University Canada Département d'Informatique Boursier FRIA du FNRS Université Libre de Bruxelles Belgium Departament de Matemática Aplicada II Universitat Politécnica de Catalunya Spain College of Science and Engineering American University of Armenia Armenia

In this paper, we show that the θ-graph with three cones is connected. We also provide an alternative proof of the connectivity of the Yao-graph with three cones.

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High-resolution contrast enhanced multi-phase hepatic Computed Tomography data fromaporcine Radio-Frequency Ablation study

High-resolution contrast enhanced multi-phase hepatic Comput...

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IEEE International Symposium on Biomedical Imaging

作者： Bernhard Kainz Philip Voglreiter Michael Sereinigg Iris Wiederstein-Grasser Ursula Mayrhauser Sonja Köstenbauer Mika Pollari Rostislav Khlebnikov Matthias Seise Tuomas Alhonnoro Yrjö Häme Daniel Seider Ronan Flanagan Claire Bost Judith Mühl David O'Neill Tingying Peng Stephen Payne Daniel Rueckert Dieter Schmalstieg Michael Moche Marina Kolesnik Philipp Stiegler Rupert H. Portugaller Department of Computing Imperial College London UK Institute for Computer Graphics and Vision (ICG) Graz University of Technology AUT Department for Surgery Medical University Graz AUT Division of Biomedical Research and Section for Surgical Research Medical University Graz AUT Medizinische Universitat Graz Graz Steiermark AT Department of Biomedical Engineering and Computational Science Aalto University FI Schloss Birlinghoven Fraunhofer Institute for Applied Information Technology GER Department of Diagnostic and Interventional Radiology Leipzig University Hospital Leipzig GER NUMA Engineering Services Ltd. Dundalk Co. Louth IRE Department of Engineering Science Keble College Oxford UK University Clinic of Radiology Medical University Graz AUT

Data below 1 mm voxel size is getting more and more common in the clinical practice but it is still hard to obtain a consistent collection of such datasets for medical image processing research. With this paper we provide a large collection of Contrast Enhanced (CE) Computed Tomography (CT) data from porcine animal experiments and describe their acquisition procedure and peculiarities. We have acquired three CE-CT phases at the highest available scanner resolution of 57 porcine livers during induced respiratory arrest. These phases capture contrast enhanced hepatic arteries, portal venous veins and hepatic veins. Therefore, we provide scan data that allows for a highly accurate reconstruction of hepatic vessel trees. Several datasets have been acquired during Radio-Frequency Ablation (RFA) experiments. Hence, many datasets show also artificially induced hepatic lesions, which can be used for the evaluation of structure detection methods.

关键词： Lesions Computed tomography Veins Biomedical imaging Animals Liver Educational institutions

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Convex hull alignment through translation 25

Convex hull alignment through translation

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25th Canadian Conference on Computational Geometry, CCCG 2013

作者： Hoffmann, Michael Kusters, Vincent Rote, Günter Saumell, Maria Silveira, Rodrigo I. Institute of Theoretical Computer Science ETH Zürich Switzerland Institut Für Informatik Freie Universität Berlin Germany Département d'Informatique Université Libre de Bruxelles Belgium Dept. Matemàtica Aplicada II Universitat Politecnica de Catalunya Spain

Given k finite point sets A1, . . . ,Ak in R2, we are interested in finding one translation for each point set such that the union of the translated point sets is in convex position. We show that if k is part of the input, then it is NP-hard to determine if such translations exist, even when each point set has at most three points. The original motivation of this problem comes from the question of whether a given triangulation T of a point set is the empty shape triangulation with respect to some (strictly convex) shape S. In other words, we want to find a shape S such that the triangles of T are precisely those triangles about which we can circumscribe a homothetic copy of S that does not contain any other vertices of T. This is the Delaunay criterion with respect to S;for the usual Delaunay triangulation, S is the circle.

关键词： Triangulation

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2013年 7831 LNCS卷 V-VI页

作者： Krawiec, Krzysztof Moraglio, Alberto Hu, Ting Etaner-Uyar, A. Şima Hu, Bin Poznan University of Technology Institute of Computing Science Piotrowo 2 60-965 Poznań Poland University of Birmingham School of Computer Science Edgbaston Birmingham B15 2TT United Kingdom Dartmouth College Geisel School of Medicine Hanover NH 03755 United States Istanbul Technical University Department of Computer Engineering Masla 34469 Istanbul Turkey Vienna University of Technology Institute of Computer Graphics and Algorithms 1040 Vienna Austria

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3D Semantic Parameterization for Human Shape Modeling: Application to 3D Animation

3D Semantic Parameterization for Human Shape Modeling: Appli...

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

作者： Christian Rupprecht Olivier Pauly Christian Theobalt Slobodan Ilic Department of Computer Science CAMP Technische Universität München Germany Technische Universitat Munchen Munchen Bayern DE Graphics Vision & Video Max Planck Institute Germany

Statistical human body models, like SCAPE, capture static 3D human body shapes and poses and are applied to many computer Vision problems. Defined in a statistical context, their parameters do not explicitly capture semantics of the human body shapes such as height, weight, limb length, etc. Having a set of semantic parameters would allow users and automated algorithms to sample the space of possible body shape variations in a more intuitive way. Therefore, in this paper we propose a method for re-parameterization of statistical human body models such that shapes are controlled by a small set of intuitive semantic parameters. These parameters are learned directly from the available statistical human body model. In order to apply any arbitrary animation to our human body shape model we perform retargeting. From any set of 3D scans, a semantic parametrized model can be generated and animated with the presented methods using any animation data. We quantitatively show that our semantic parameterization is more reliable than standard semantic parameterizations, and show a number of animations retargeted to our semantic body shape model.

关键词： Semantics Shape Three-dimensional displays Animation Biological system modeling Bones

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Joint 3D cell segmentation and classification in the Arabidopsis root using energy minimization and shape priors

Joint 3D cell segmentation and classification in the Arabido...

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IEEE International Symposium on Biomedical Imaging

作者： Kun Liu Thorsten Schmidt Thomas Blein Jasmin Dürr Klaus Palme Olaf Ronneberger Department of Computer Science BIOSS Centre for Biological Signalling Studies University of Freiburg Germany Institute of Biology II University of Freiburg Germany Institute of Biology II BIOSS Centre for Biological Signalling Studies University of Freiburg Germany

ISBN: (纸本)9781467364560

This paper presents a discrete energy minimization approach to integrate different prior knowledge and image cues for simultaneous cell segmentation and classification. When there are multiple types of cells to segment, the segmentation of cells and the classification of the cell types are dependent on each other. The presented approach selects the optimal segmentations from hypotheses and infers the cell types in the same process. The approach is applied to the volumetric data of Arabidopsis roots.

关键词： Image segmentation Shape Training Imaging Minimization Merging Optimization

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Variational attenuation correction of two-view confocal microscopic recordings

Variational attenuation correction of two-view confocal micr...

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IEEE International Symposium on Biomedical Imaging

作者： Thorsten Schmidt Jasmin Dürr Margret Keuper Thomas Blein Klaus Palme Olaf Ronneberger Image Analysis Lab Institute of Computer Science Albert-Ludwigs-Universität Freiburg Germany Institute of Biology II Albert-Ludwigs-Universität Freiburg Germany Institute of Biology II BIOSS Centre for Biological Signalling Studies Albert-Ludwigs-Universität Freiburg Germany Image Analysis Lab Institute of Computer Science BIOSS Centre for Biological Signalling Studies Albert-Ludwigs-Universität Freiburg Germany

ISBN: (纸本)9781467364560

We present an approach to recover attenuation-free intensities of a thick sample, that is imaged by a standard confocal microscope from two views (top and bottom). A variational approach simultaneously estimates the local signal attenuation and the real attenuation-free intensity at each position. Compared to earlier work we introduce a refined image formation model, that models photo-bleaching and photon noise using Poisson image statistics. We examine the effects of different regularization methods on the absorption field (Tikhonov-Miller, Total Variation, and sparsity) and the benefit of a constrained optimization in comparison to an orthogonal subspace projection. We quantify the efficacy of the approach on synthetically generated samples, and show its general applicability on two real biological applications, namely the recordings of zebrafish embryos and Arabidopsis thaliana root tips.

关键词： Attenuation Absorption Microscopy Noise Bleaching Phantoms TV

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