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computer graphics International

作者： Z. Deng J.P. Lewis U. Neumann Computer Graphics and lmmersive Technologies Lab Department of Computer Science. Integrated Media System Center University of Southern California USA

While speech animation fundamentally consists of a sequence of phonemes over time, sophisticated animation requires smooth interpolation and co-articulation effects, where the preceding and following phonemes influence the shape of a phoneme. Co-articulation has been approached in speech animation research in several ways, most often by simply smoothing the mouth geometry motion over time. Data-driven approaches tend to generate realistic speech animation, but they need to store a large facial motion database, which is not feasible for real time gaming and interactive applications on platforms such as PDAs and cell phones. In this paper we show that accurate speech co-articulation model with compact size can be learned from facial motion capture data. An initial phoneme sequence is generated automatically from text-to-speech (TTS) systems. Then, our learned co-articulation model is applied to the resulting phoneme sequence, producing natural and detailed motion. The contribution of this work is that speech co-articulation models "learned" from real human motion data can be used to generate natural-looking speech motion while simultaneously preserving the expressiveness of the animation via keyframing control. Simultaneously, this approach can be effectively applied to interactive applications due to its compact size.

关键词： Speech synthesis Interpolation Shape Smoothing methods Mouth Geometry Facial animation Spatial databases Personal digital assistants Cellular phones

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Real-time out-of-core visualization of particle traces

Real-time out-of-core visualization of particle traces

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IEEE Symposium on Parallel and Large-Data Visualization and graphics (PVG)

作者： R. Bruckschen F. Kuester B. Hamann K.I. Joy Visualization and Graphics Research Group Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA Visualization and Interactive Systems Group Department of Electrical and Computer Engineering University of California Irvine CA USA

ISBN: (纸本)0780372239

Visualization of particle traces provides intuitive and efficient means for the exploration and analysis of complex vector fields. The paper presents a method suitable for the real-time visualization of arbitrarily large time-varying vector fields in virtual environments. We describe an out-of-core scheme in which two distinct pre-processing and rendering components enable real-time data streaming and visualization. The presented approach yields low-latency application start-up times and small memory footprints. The described system was used to implement a "volumetric fog lance," which can emit up to 60000 particles into a flow field while maintaining an interactive frame rate of 60 frames per second. All algorithms were specifically designed to support commodity hardware. The proof-of-concept system is running on a low-cost Linux workstation equipped with a 120 GB E-IDE RAID (redundant array of inexpensive disk) system.

关键词： Data visualization Computational modeling Computational fluid dynamics Motion pictures Hardware computer graphics interactive systems Image processing computer science Image analysis

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A multilinear model for bidirectional craniofacial reconstruction

A multilinear model for bidirectional craniofacial reconstru...

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2018 Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2018

作者： Achenbach, Jascha Brylka, Robert Gietzen, Thomas Zum Hebel, Katja Schömer, Elmar Schulze, Ralf Botsch, Mario Schwanecke, Ulrich Bielefeld University Computer Graphics and Geometry Processing Group Germany RheinMain University of Applied Sciences Computer Vision and Mixed Reality Group Wiesbaden Rüsselsheim Germany University Medical Center Johannes Gutenberg University Department of Prosthetic Dentistry Mainz Germany University Medical Center Johannes Gutenberg University Section of Oral Radiology Mainz Germany Johannes Gutenberg University Mainz Institute of Computer Science Germany

ISBN: (纸本)9783038680567

We present a bidirectional facial reconstruction method for estimating the skull given a scan of the skin surface and vice versa estimating the skin surface given the skull. Our approach is based on a multilinear model that describes the correlation between the skull and the facial soft tissue thickness (FSTT) on the one hand and the head/face surface geometry on the other hand. Training this model requires to densely sample the Cartesian product space of skull shape times FSTT variation, which cannot be obtained by measurements alone. We generate this data by enriching measured data—volumetric computed tomography scans and 3D surface scans of the head—by simulating statistically plausible FSTT variations. We demonstrate the versatility of our novel multilinear model by estimating faces from given skulls as well as skulls from given faces within just a couple of seconds. To foster further research in this direction, we will make our multilinear model publicly available. © 2018 The Author(s) Eurographics Proceedings © 2018 The Eurographics Association.

关键词： computerized tomography

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Identifying intracortical partial voluming effects using cortical surface normals in quantitative MRI T1 maps sensitive to microstructure

Identifying intracortical partial voluming effects using cor...

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Workshops on Image processing for the medicine, 2016

作者： Dinse, Juliane Schäfer, Andreas Bazin, Pierre-Louis Weiskopf, Nikolaus Max Planck Institute of Cognitive and Brain Science Leipzig Germany Simulation and Graphics Department Faculty of Computer Science Otto-von-Guericke University Magdeburg Germany Wellcome Trust Center for Neuroimaging Institute for Neurology University College London London United Kingdom

ISBN: (纸本)9783662494646

Partial voluming is a known problem in medical imaging. It occurs at high contrast edges between different structures. Image segmentation tasks can account for this type of effect to a certain degree, but residual intensity effects in structures located further away from affected edges remain. This paper focuses on partial volume (PV) effects at the interface between gray matter and cerebrospinal fluid in the brain when imaged using high-field magnetic resonance imaging (MRI). Here, we use cortical surface normals for spatially locating PV-induced effects on MRI measures of cortical microstructure. We demonstrate that especially in very narrow sulcal banks of the cortex, PV effects significantly influence cortical MRI intensities, but only up to a certain cortical depth. The method allows to investigate and better understand PV effects in the cortex to identify locations in which the MRI intensities can be fully trusted. The results may prove to be useful for future PV correction methods in brain segmentation. Also, cortical area studies may benefit from better PV estimation in order to yield more precise and confiding results on microstructure and areal extent. © Springer-Verlag Berlin Heidelberg 2016.

关键词： Magnetic resonance imaging

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GPU-assisted z-field simplification

GPU-assisted z-field simplification

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International Symposium on 3D Data Processing Visualization and Transmission

作者： A. Bogomjakov C. Gotsman Center of Graphics and Geometric Computing Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Height fields and depth maps which we collectively refer to as z-fields, usually carry a lot of redundant information and are often used in real-time applications. This is the reason why efficient methods for their simplification are necessary. On the other hand, the computation power and programmability of commodity graphics hardware has significantly grown. We present an adaptation of an existing real-time z-field simplification method for execution in graphics hardware. The main parts of the algorithm are implemented as fragment programs which run on the GPU. The resulting polygonal models are identical to the ones obtained by the original method. The main benefit is that the computation load is imposed on the GPU, freeing-up the CPU for other tasks. Additionally, the new method exhibits a performance improvement when compared to a pure CPU implementation.

关键词： Hardware Rendering (computer graphics) Concurrent computing computer graphics computer science Application software computer aided instruction Throughput Physics computing Pipelines

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TimeTubes: Visual Exploration of Observed Blazar Datasets

TimeTubes: Visual Exploration of Observed Blazar Datasets

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International Meeting on High-Dimensional Data-Driven science, HD3 2017

作者： Fujishiro, Issei Sawada, Naoko Nakayama, Masanori Wu, Hsiang-Yun Watanabe, Kazuho Takahashi, Shigeo Uemura, Makoto Center for Information and Computer Science Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Institute of Computer Graphics and Algorithms TU Wien Favoritenstr. 9 / 5. Stock ViennaA-1040 Austria Department of Computer Science and Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi441-8580 Japan School of Computer Science and Engineering University of Aizu Aizu Wakamatsu Fukushima965-8580 Japan Astrophysical Science Center Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima739-8526 Japan

Blazars are attractive objects for astronomers to observe in order to burrow into the magnetic field in the relativistic jet. This paper presents TimeTubes as a novel visualization scheme that allows astronomers to interactively explore characteristic temporal variation patterns in observed blazar datasets. In the TimeTubes spatialization, the two Stokes parameters and their errors with a common timestamp are transformed into an ellipse. A series of such ellipses are aligned in parallel along the timeline to form a 3D volumetric tube. The resulting tube is then colorized by the observed intensities and colors of the blazar, and finally volume-rendered. A designated user interface is provided with visual exploration functions according to Shneiderman's Visual Information Seeking Mantra. In the latest version, an auxiliary mechanism, called visual data fusion, was incorporated to ameliorate data- and mapping-inherent uncertainties for more efficient and effective visual exploration. © Published under licence by IOP Publishing Ltd.

关键词： Data fusion

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Advances in Discrete Tomography and Its Applications 1

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丛书名： Applied and Numerical Harmonic Analysis

2007年

作者： Gabor T. Herman Attila Kuba

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Hardware assisted multichannel volume rendering

Hardware assisted multichannel volume rendering

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computer graphics International

作者： Abhijeet Ghosh Poojan Prabhu A.E. Kaufman K. Mueller Center for Visual Computing and Computer Science Department Stony Brook University Stony Brook NY USA Fraunhofer-Institute of Computer Graphics Germany

We explore real time volume rendering of multichannel data for volumes with color and multimodal information. We demonstrate volume rendering of the visible human male color dataset and photorealistic rendering of voxelized terrains, and achieve high quality visualizations. We render multimodal volumes utilizing hardware programmability for accumulation level mixing, and use CT and MRI information as examples. We also use multiboard parallel/distributed rendering schemes for large datasets and investigate scalability issues. We employ the VolumePro 1000 for real time multichannel volume rendering. Our approach, however, is not hardware-specific and can use commodity texture hardware instead.

关键词： Hardware Rendering (computer graphics) computer graphics Humans Data visualization Computed tomography Magnetic resonance imaging Biomedical imaging Satellites Terrain mapping

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Improved Upper Bounds on the Growth Constants of Polyominoes and Polycubes

arXiv

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arXiv 2019年

作者： Barequet, Gill Shalah, Mira Center for Graphics Geometric Computing Computer Science Department Technion—Israel Institute of Technology Haifa3200003 Israel Computer Science Department Stanford University CA United States

A d-dimensional polycube is a facet-connected set of cells (cubes) on the d-dimensional cubical lattice Zd. Let Ad(n) denote the number of d-dimensional polycubes (distinct up to translations) with n cubes, and λd denote the limit of the ratio Ad(n+1)/Ad(n) as n → ∞. The exact value of λd is still unknown rigorously for any dimension d ≥ 2;the asymptotics of λd, as d → ∞, also remained elusive as of today. In this paper, we revisit and extend the approach presented by Klarner and Rivest in 1973 to bound A2(n) from above. Our contributions are: • Using available computing power, we prove that λ2 ≤ 4.5252. This is the first improvement of the upper bound on λ2 in almost half a century;• We prove that λd ≤ (2d−2)e+o(1) for any value of d ≥ 2, using a novel construction of a rational generating function which dominates that of the sequence (Ad(n));• For d = 3, this provides a subtantial improvement of the upper bound on λ3 from 12.2071 to 9.8073;• However, we implement an iterative process in three dimensions, which improves further the upper bound on λ3 to 9.3835;Copyright © 2019, The Authors. All rights reserved.

关键词： Rational functions

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Touching Remote Mixed Worlds : Simulation & Reality

Touching Remote Mixed Worlds : Simulation & Reality

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Asian Simulation Conference/The 6th International conference on system Simulation and Scientific Computing

作者： Myoung-Hee Kim Director Center for Computer Graphics and Virtual Reality Professor Department of Computer Science and Engineering Ewha Womans University Seoul Korea Prof.

As virtual environment technology becomes accessible and affordable, there has been an increase in constructing and connecting virtual worlds. Networked virtual environments allow us to meet and interact with people even though they may be located in different parts of the world. It has been employed in many simulative applications such as manufacturing, business, education, medicine and so on. Networked virtual environment can be more realistic and powerful by applying mixed reality technology merging real and virtual worlds. Focusing on the theme about building and connecting mixed worlds, technical issues are analyzed in terms of data acquisition, visualization, interaction, network communication, and so on. Exploring related work of many research laboratories, future possibilities are also discussed.

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