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13th Eurographics / IEEE Symposium on visualization, EuroVis 2011

作者： Beketayev, K. Weber, G.H. Haranczyk, M. Bremer, P.-T. Hlawitschka, M. Hamann, B. Computational Research Division Lawrence Berkeley National Laboratory United States Center for Applied Scientific Computing Lawrence Livermore National Laboratory United States Institute for Data Analysis and Visualization Department of Computer Science University of California Davis CA United States

(Figure Presented) Studying transformation in a chemical system by considering its energy as a function of coordinates of the system's components provides insight and changes our understanding of this process. Currently, a lack of effective visualization techniques for high-dimensional energy functions limits chemists to plot energy with respect to one or two coordinates at a time. In some complex systems, developing a comprehensive understanding requires new visualization techniques that show relationships between all coordinates at the same time. We propose a new visualization technique that combines concepts from topological analysis, multi-dimensional scaling, and graph layout to enable the analysis of energy functions for a wide range of molecular structures. We demonstrate our technique by studying the energy function of a dimer of formic and acetic acids and a LTA zeolite structure, in which we consider diffusion of methane. © 2011 The Author(s) Journal compilation © 2011 The Eurographics Association and Blackwell Publishing Ltd. Published by Blackwell Publishing.

关键词： Dimers

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Implant sprays: compression of progressive tetrahedral mesh connectivity

Implant sprays: compression of progressive tetrahedral mesh ...

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IEEE Conference on visualization

作者： R. Pajarola J. Rossignac A. Szymczak GVU Center Georgia Institute of Technology College of Computing Georgia Institute of Technology Atlanta GA USA Graphics Visualization & Usability Center Georgia Institute of Technology USA

Irregular tetrahedral meshes, which are popular in many engineering and scientific applications, often contain a large number of vertices. A mesh of V vertices and T tetrahedra requires 48 V bits or less to store the vertex coordinates, 4/spl middot/T/spl middot/log/sub 2/(V) bits to store the tetrahedra-vertex incidence relations, also called connectivity information, and kV bits to store the k-bit value samples associated with the vertices. Given that T is 5 to 7 times larger than V and that V often exceeds 32/sup 3/, the storage space required for the connectivity is larger than 300 V bits and thus dominates the overall storage cost. Our "implants spray" compression approach introduced in the paper reduces this cost to about 30 V bits or less-a 10:1 compression ratio. Furthermore, implant spray supports the progressive refinement of a crude model through a series of vertex-splits operations.

关键词： Implants Spraying Costs Encoding Solid modeling Graphics visualization Usability Chromium Computational geometry

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End-to-end data reduction and hardware accelerated rendering techniques for visualizing time-varying non-uniform grid volume data 05

End-to-end data reduction and hardware accelerated rendering...

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International Workshop on Volume Graphics, VG

作者： H. Akiba Kwan-Liu Ma J. Clyne Institute for Data Analysis and Visualization University of California슠Davis USA Scientific Computing Devision National Center for Atmospheric Research CO USA

ISBN: (纸本)3905673266

We present a systematic approach for direct volume rendering terascale-sized data that are time-varying, and possibly non-uniformly sampled, using only a single commodity graphics PC. Our method employs a data reduction scheme that combines lossless, wavelet-based progressive data access with a user-directed, hardware-accelerated data packing technique. Data packing is achieved by discarding data blocks with values outside the data interval of interest and encoding the remaining data in a structure that can be efficiently decoded in the GPU. The compressed data can be transferred between disk, main memory, and video memory more efficiently, leading to more effective data exploration in both spatial and temporal domains. Furthermore, our texture-map based volume rendering system is capable of correctly displaying data that are sampled on a stretched, Cartesian grid. To study the effectiveness of our technique we used data sets generated from a large solar convection simulation, computed on a non-uniform, 504/spl times/504/spl times/2048 grid.

关键词： Hardware Acceleration Data visualization Rendering (computer graphics) Time varying systems Graphics Encoding Decoding Video compression Mesh generation

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Migratory applications 95

Migratory applications

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Proceedings of the 8th annual ACM symposium on User interface and software technology

作者： Krishna A. Bharat Luca Cardelli Graphics Visualization & Usability Center College of Computing Georgia Tech. Atlanta GA Digital Systems Research Center 130 Lytton Avenue Palo Alto CA

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Automatic Joint Parameter Estimation from Magnetic Motion Capture Data

arXiv

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arXiv 2023年

作者： O’Brien, James F. Bodenheimer, Robert E. Brostow, Gabriel J. Hodgins, Jessica K. College of Computing and Graphics Visualization and Usability Center Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

This paper describes a technique for using magnetic motion capture data to determine the joint parameters of an articulated hierarchy. This technique makes it possible to determine limb lengths, joint locations, and sensor placement for a human subject without external measurements. Instead, the joint parameters are inferred with high accuracy from the motion data acquired during the capture session. The parameters are computed by performing a linear least squares fit of a rotary joint model to the input data. A hierarchical structure for the articulated model can also be determined in situations where the topology of the model is not known. Once the system topology and joint parameters have been recovered, the resulting model can be used to perform forward and inverse kinematic procedures. We present the results of using the algorithm on human motion capture data, as well as validation results obtained with data from a simulation and a wooden linkage of known dimensions. © 2023, CC BY-SA.

关键词： Parameter estimation

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Reconstructing surfaces using anisotropic basis functions

Reconstructing surfaces using anisotropic basis functions

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International Conference on Computer Vision (ICCV)

作者： Huong Quynh Dinh G. Turk G. Slabaugh Graphics Visualization and Usability CenterCollege of Computing Georgia Institute of Technology USA School of Electrical and Computer Engineering Center for Signal and Image Processing Georgia Institute of Technology USA

ISBN: (纸本)0769511430

Point sets obtained from computer vision techniques are often noisy and non-uniform. We present a new method of surface reconstruction that can handle such data sets using anisotropic basis functions. Our reconstruction algorithm draws upon the work in variational implicit surfaces for constructing smooth and seamless 3D surfaces. Implicit functions are often formulated as a sum of weighted basis functions that are radially symmetric. Using radially symmetric basis functions inherently assumes, however that the surface to be reconstructed is, everywhere, locally symmetric. Such an assumption is true only at planar regions, and hence, reconstruction using isotropic basis is insufficient to recover objects that exhibit sharp features. We preserve sharp features using anisotropic basis that allow the surface to vary locally. The reconstructed surface is sharper along edges and at corner points. We determine the direction of anisotropy at a point by performing principal component analysis of the data points in a small neighborhood. The resulting field of principle directions across the surface is smoothed through tensor filtering. We have applied the anisotropic basis functions to reconstruct surfaces from noisy synthetic 3D data and from real range data obtained from space carving.

关键词： Surface reconstruction Anisotropic magnetoresistance Image reconstruction Surface fitting Optical noise Shape Polynomials Computer vision Surface emitting lasers Space technology

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Gravitational tuning forks and hierarchical triple systems

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Physical Review D 2021年第8期103卷 L081501-L081501页

作者： Vitor Cardoso Francisco Duque Gaurav Khanna Department of Physics and Center for Scientific Computing and Visualization Research University of Massachusetts Darthmouth Massachusetts 02747 USA and Department of Physics The University of Rhode Island Kingston Rhode Island 02881

We study gravitational wave (GW) emission in the strong-field regime by a hierarchical triple system composed of a binary system placed in the vicinity of a supermassive black hole (SMBH). The LIGO-Virgo Collaboration recently reported evidence for coalescences with this dynamical origin. These systems are common in galactic centers and thus, are a target for the space-based LISA mission as well as other advanced detectors. Doppler shifts, aberration, lensing, and strong amplitude modulations are features present in the GW signal from these systems, built into our framework and with no need for phenomenological patches. We find that the binary can resonantly excite the quasinormal modes of the SMBH, as in the resonant excitation of two tuning forks with matching frequencies. The flux of energy crossing the SMBH horizon can be significant, when compared with that from standard extreme-mass-ratio inspirals. Therefore, these triple systems are excellent probes of strong-field physics and of the BH nature of compact objects.

关键词： Astrophysical studies of gravity General relativity equations & solutions Gravitational waves Classical black holes Galactic nuclei & quasars

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Performance Comparison of Multiple Image Depth and Shape Cues

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International Journal of Human-Computer Interaction 1993年第4期5卷 347-360页

作者： Adelson, Stephen J. Allen, Jeanette Badre, Albert N. Hodges, Larry F. Lawrence, Andrea Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 United States

This research has implications for tasks in human-computer interaction where the user must interact with display information that is organized on multiple axes. We describe the results of an experiment that compared the effectiveness of five different techniques for shape and depth discrimination. The methods evaluated were binocular parallax, alternating horizontal parallax, alternating vertical parallax, motion parallax, and motion parallax in conjunction with the Pulfrich effect. Binocular parallax, closely followed by motion parallax and the Pulfrich effect, was most effective for the depth discrimination task in terms of both correctness and response time. Alternating parallax techniques provided cues for distinguishing between foreground and background in a scene but did not provide cues that were intuitively translated into depth. Response time of subjects for the shape discrimination task was fastest with alternating parallax. For depth discrimination, subjects preferred binocular parallax. For shape discrimination, binocular parallax and motion parallax were both highly rated. © 1993, Taylor & Francis Group, LLC. All right reserved.

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Scalable Atomistic Simulation Algorithms for Materials Research 01

Scalable Atomistic Simulation Algorithms for Materials Resea...

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2001 ACM/IEEE Conference on Supercomputing, SC 2001

作者： Nakano, Aiichiro Kalia, Rajiv K. Vashishta, Priya Campbell, Timothy J. Ogata, Shuji Shimojo, Fuyuki Saini, Subhash Concurrent Computing Laboratory Materials Simulations Biological Computation and Visualization Center Department of Computer Science Department of Physics and Astronomy Louisiana State University United States Logicon Inc. Naval Oceanographic Office Major Shared Resource Center Department of Applied Sciences Yamaguchi University Japan Faculty of Integrated Arts and Sciences Hiroshima University Japan It Modeling and Simulation Nasa Ames Research Center

ISBN: (纸本)158113293X

A suite of scalable atomistic simulation programs has been developed for materials research based on space-time multiresolution algorithms. Design and analysis of parallel algorithms are presented for molecular dynamics (MD) simulations and quantum-mechanical (QM) calculations based on the density functional theory. Performance tests have been carried out on 1,088-processor Cray T3E and 1,280-processor IBM SP3 computers. The linear-scaling algorithms have enabled 6.44-billion-atom MD and 111,000-atom QM calculations on 1,024 SP3 processors with parallel efficiency well over 90%. The production-quality programs also feature wavelet-based computational-space decomposition for adaptive load balancing, spacefilling-curve-based adaptive data compression with user-defined error bound for scalable I/O, and octree-based fast visibility culling for immersive and interactive visualization of massive simulation data. © 2001 ACM.

关键词： Density functional theory

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Integrating meeting capture within a collaborative team environment 1

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International Conference on Ubiquitous computing, Ubicomp 2001

作者： Richter, Heather Abowd, Gregory D. Geyer, Werner Fuchs, Ludwin Daijavad, Shahrokh Poltrock, Steven Georgia Institute of Technology Graphics Visualization and Usability Center 801 Atlantic Drive AtlantaGA30332 United States IBM T.J. Watson Research Center 30 Saw Mill River Road HawthorneNY10532 United States Boeing Mathematics and Computing Technology PO Box 3707 SeattleWA98124 United States

ISBN: (数字)9783540454274

ISBN: (纸本)3540426140

Meeting capture has been a common subject of research in the ubiquitous computing community for the past decade. However, the majority of the research has focused on technologies to support the capture but not enough on the motivation for accessing the captured record and the impact on everyday work practices based on extended authentic use of a working capture and access system. Our long-term research agenda is to build capture services for distributed workgroups that provide appropriate motivation and further understand how access of captured meetings impacts work practices. To do this, we have developed a testbed for meeting capture as part of a larger distributed work system called TeamSpace. In this paper, we discuss the requirements for meeting capture within TeamSpace, describe the initial prototype developed, and report on initial usage. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Motivation

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