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Displaying 1-50 out of 71 total
Exploring Scalar Fields Using Critical Isovalues
Found in: Visualization Conference, IEEE
By Gunther H. Weber, Gerik Scheuermann, Hans Hagen, Bernd Hamann
Issue Date:November 2002
pp. N/A
Isosurfaces are commonly used to visualize scalar fields. Critical isovalues indicate isosurface topology changes: the creation of new surface components, merging of surface components or the formation of holes in a surface component. Therefore, they highl...
 
A Magnification Lens for Interactive Volume Visualization
Found in: Computer Graphics and Applications, Pacific Conference on
By Eric LaMar, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2001
pp. 0223
Volume visualization of large data sets suffers from the same problem that many other visualization modalities suffer from: either one can visualize the entire data set and loose small details or visualize a small region and loose the context. In this pape...
 
Construction of Vector Field Hierarchies
Found in: Visualization Conference, IEEE
By Bjoern Heckel, Gunther Weber, Bernd Hamann, Kenneth I. Joy
Issue Date:October 1999
pp. 1
We present a method for the hierarchical representation of vector fields. Our approach is based on iterative refinement using clustering and principal component analysis. The input to our algorithm is a discrete set of points with associated vectors. The a...
 
IRIS: Illustrative Rendering for Integral Surfaces
Found in: IEEE Transactions on Visualization and Computer Graphics
By Mathias Hummel, Christoph Garth, Bernd Hamann, Hans Hagen, Kenneth I. Joy
Issue Date:November 2010
pp. 1319-1328
Integral surfaces are ideal tools to illustrate vector fields and fluid flow structures. However, these surfaces can be visually complex and exhibit difficult geometric properties, owing to strong stretching, shearing and folding of the flow from which the...
 
Real-Time Out-of-Core Visualization of Particle Traces
Found in: Parallel and Large-Data Visualization and Graphics, IEEE Symposium on
By Ralph Bruckschen, Falko Kuester, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2001
pp. 45-50
Visualization of particle traces provides intuitive and efficient means for the exploration and analysis of complex vector fields. This paper presents a method suitable for the real-time visualization of arbitrarily large time-varying vector fields in virt...
 
Visual Steering and Verification of Mass Spectrometry Data Factorization in Air Quality Research
Found in: IEEE Transactions on Visualization and Computer Graphics
By Daniel Engel,Klaus Greff,Christoph Garth,Keith Bein,Anthony Wexler,Bernd Hamann,Hans Hagen
Issue Date:December 2012
pp. 2275-2284
The study of aerosol composition for air quality research involves the analysis of high-dimensional single particle mass spectrometry data. We describe, apply, and evaluate a novel interactive visual framework for dimensionality reduction of such data. Our...
 
Abstract: Exploring Performance Data with Boxfish
Found in: 2012 SC Companion: High Performance Computing, Networking, Storage and Analysis (SCC)
By Katherine E. Isaacs,Aaditya G. Landge,Todd Gamblin,Peer-Timo Bremer,Valerio Pascucci,Bernd Hamann
Issue Date:November 2012
pp. 1380-1381
The growth in size and complexity of scaling applications and the systems on which they run pose challenges in analyzing and improving their overall performance. With metrics coming from thousands or millions of processes, visualization techniques are nece...
 
Novel views of performance data to analyze large-scale adaptive applications
Found in: 2012 SC - International Conference for High Performance Computing, Networking, Storage and Analysis
By Abhinav Bhatele,Todd Gamblin,Katherine E. Isaacs,Brian T. N. Gunney,Martin Schulz,Peer-Timo Bremer,Bernd Hamann
Issue Date:November 2012
pp. 1-11
Performance analysis of parallel scientific codes is becoming increasingly difficult due to the rapidly growing complexity of applications and architectures. Existing tools fall short in providing intuitive views that facilitate the process of performance ...
 
Progressive parallel coordinates
Found in: Visualization Symposium, IEEE Pacific
By Rene Rosenbaum,Jian Zhi,Bernd Hamann
Issue Date:March 2012
pp. 25-32
Progressive refinement is a methodology that makes it possible to elegantly integrate scalable data compression, access, and presentation into one approach. Specifically, this paper concerns the effective use of progressive parallel coordinates (PPCs), uti...
 
Visually Relating Gene Expression and in vivo DNA Binding Data
Found in: Bioinformatics and Biomedicine, IEEE International Conference on
By Min-Yu Huang,Lester Mackey,Soile V.E. Keränen,Gunther H. Weber,Michael I. Jordan,David W. Knowles,Mark D. Biggin,Bernd Hamann
Issue Date:November 2011
pp. 586-589
Gene expression and in vivo DNA binding data provide important information for understanding gene regulatory networks: in vivo DNA binding data indicate genomic regions where transcription factors are bound, and expression data show the output resulting fr...
 
The Topological Effects of Smoothing
Found in: IEEE Transactions on Visualization and Computer Graphics
By Sohail Shafii,Scott E. Dillard,Mario Hlawitschka,Bernd Hamann
Issue Date:January 2012
pp. 160-172
Scientific data sets generated by numerical simulations or experimental measurements often contain a substantial amount of noise. Smoothing the data removes noise but can have potentially drastic effects on the qualitative nature of the data, thereby influ...
 
Automated Analysis for Detecting Beams in Laser Wakefield Simulations
Found in: Machine Learning and Applications, Fourth International Conference on
By Daniela M. Ushizima, Oliver Rübel, Prabhat, Gunther H. Weber, E. Wes Bethel, Cecilia R. Aragon, Cameron G. R. Geddes, Estelle Cormier-Michel, Bernd Hamann, Peter Messmer, Hans Hagen
Issue Date:December 2008
pp. 382-387
Laser wakefield particle accelerators have shown the potential to generate electric fields thousands of times higher than those of conventional accelerators. The resulting extremely short particle acceleration distance could yield a potential new compact s...
 
High performance multivariate visual data exploration for extremely large data
Found in: SC Conference
By Oliver Rübel, Prabhat, Kesheng Wu, Hank Childs, Jeremy Meredith, Cameron G. R. Geddes, Estelle Cormier-Michel, Sean Ahern, Gunther H. Weber, Peter Messmer, Hans Hagen, Bernd Hamann, E. Wes Bethel
Issue Date:November 2008
pp. 1-12
One of the central challenges in modern science is the need to quickly derive knowledge and understanding from large, complex collections of data. We present a new approach that deals with this challenge by combining and extending techniques from high perf...
 
A Geometric Representation of Protein Sequences
Found in: Bioinformatics and Biomedicine, IEEE International Conference on
By Shengyin Gu, Olivier Poch, Bernd Hamann, Patrice Koehl
Issue Date:November 2007
pp. 135-142
The amino acid sequence of a protein is the key to understanding its structure and ultimately its function in the cell. This paper addresses the fundamental is- sue of encoding amino acids in ways that the visual- ization of protein sequences facilitates t...
 
Anisotropic Noise Samples
Found in: IEEE Transactions on Visualization and Computer Graphics
By Louis Feng, Ingrid Hotz, Bernd Hamann, Kenneth Joy
Issue Date:March 2008
pp. 342-354
We present a practical approach to generate stochastic anisotropic samples with Poisson-disk characteristic over a two-dimensional domain. In contrast to isotropic samples, we understand anisotropic samples as non-overlapping ellipses whose size and densit...
 
A Topological Approach to Simplification of Three-Dimensional Scalar Functions
Found in: IEEE Transactions on Visualization and Computer Graphics
By Attila Gyulassy, Vijay Natarajan, Valerio Pascucci, Peer-Timo Bremer, Bernd Hamann
Issue Date:July 2006
pp. 474-484
<p><b>Abstract</b>—This paper describes an efficient combinatorial method for simplification of topological features in a 3D scalar function. The Morse-Smale complex, which provides a succinct representation of a function's associated gra...
 
An Extensible Infrastructure for Processing Distributed Geospatial Data Streams
Found in: Scientific and Statistical Database Management, International Conference on
By Carlos Rueda, Michael Gertz, Bertram Ludascher, Bernd Hamann
Issue Date:July 2006
pp. 285-290
Although the processing of data streams has been the focus of many research efforts in several areas, the case of remotely sensed streams in scientific contexts has received little attention. We present an extensible architecture to compose streaming image...
 
Segmenting Point Sets
Found in: Shape Modeling and Applications, International Conference on
By Ichitaro Yamazaki, Vijay Natarajan, Zhaojun Bai, Bernd Hamann
Issue Date:June 2006
pp. 6
Extracting features from point sets is becoming increasingly important for purposes like model classification, matching, and exploration. We introduce a technique for segmenting a point-sampled surface into distinct features without explicit construction o...
 
Discrete Sibson Interpolation
Found in: IEEE Transactions on Visualization and Computer Graphics
By Sung W. Park, Lars Linsen, Oliver Kreylos, John D. Owens, Bernd Hamann
Issue Date:March 2006
pp. 243-253
<p><b>Abstract</b>—Natural-neighbor interpolation methods, such as Sibson's method, are well-known schemes for multivariate data fitting and reconstruction. Despite its many desirable properties, Sibson's method is computationally expensi...
 
A Foveal Inset for Large Display Environments
Found in: Virtual Reality Conference, IEEE
By Benjamin A. Ahlborn, Oliver Kreylos, Bernd Hamann, Oliver Staadt
Issue Date:March 2006
pp. 281-282
We introduce a system that adds a foveal inset to large-scale projection displays. The effective resolution of the foveal inset projection is higher than the original display resolution, allowing the user to see more details and finer features in large dat...
 
Evolutionary Morphing
Found in: Visualization Conference, IEEE
By David F. Wiley, Nina Amenta, Dan A. Alcantara, Deboshmita Ghosh, Yong J. Kil, Eric Delson, Will Harcourt-Smith, Katherine St. John, F. James Rohlf, Bernd Hamann
Issue Date:October 2005
pp. 55
<p>We introduce a technique to visualize the gradual evolutionary change of the shapes of living things as a morph between known three-dimensional shapes. Given geometric computer models of anatomical shapes for some collection of specimens - here th...
 
Topology-based Simplification for Feature Extraction from 3D Scalar Fields
Found in: Visualization Conference, IEEE
By Attila Gyulassy, Vijay Natarajan, Valerio Pascucci, Peer-Timo Bremer, Bernd Hamann
Issue Date:October 2005
pp. 68
In this paper, we present a topological approach for simplifying continuous functions defined on volumetric domains. We introduce two atomic operations that remove pairs of critical points of the function and design a combinatorial algorithm that simplifie...
 
3D Warp Brush: Interactive Free-Form Modeling on the Responsive Workbench
Found in: Virtual Reality Conference, IEEE
By Yong Joo Kil, Pietro Renzulli, Oliver Kreylos, Bernd Hamann, Giuseppe Monno, Oliver Staadt
Issue Date:March 2005
pp. 279-280
We introduce the 3D warp brush, a method for interactive shape modeling in a immersive virtual reality environment. 3D warp brushes are implicitly-definedtools that operate on triangle meshes. We combine the efficiency of explicit mesh representations with...
   
Multi-Dimensional Transfer Functions for Interactive 3D Flow Visualization
Found in: Computer Graphics and Applications, Pacific Conference on
By Sung W. Park, Brian Budge, Lars Linsen, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2004
pp. 177-185
Transfer functions are a standard technique used in volume rendering to assign color and opacity to a volume of a scalar field. Multi-dimensional transfer functions (MDTFs) have proven to be an effective way to extract specific features with subtle propert...
 
Physically Based Methods for Tensor Field Visualization
Found in: Visualization Conference, IEEE
By Ingrid Hotz, Louis Feng, Hans Hagen, Bernd Hamann, Kenneth Joy, Boris Jeremic
Issue Date:October 2004
pp. 123-130
<p>The physical interpretation of mathematical features of tensor fields is highly application-specific. Existing visualization methods for tensor fields only cover a fraction of the broad application areas. We present a visualization method tailored...
 
On a Construction of a Hierarchy of Best Linear Spline Approximations Using a Finite Element Approach
Found in: IEEE Transactions on Visualization and Computer Graphics
By David F. Wiley, Martin Bertram, Bernd Hamann
Issue Date:September 2004
pp. 548-563
We present a method for the hierarchical approximation of functions in one, two, or three variables based on the finite element method (Ritz approximation). Starting with a set of data sites with associated function, we first determine a smooth (scattered-...
 
Generalized B-Spline Subdivision-Surface Wavelets for Geometry Compression
Found in: IEEE Transactions on Visualization and Computer Graphics
By Martin Bertram, Mark A. Duchaineau, Bernd Hamann, Kenneth I. Joy
Issue Date:May 2004
pp. 326-338
<p><b>Abstract</b>—We present a new construction of lifted biorthogonal wavelets on surfaces of arbitrary two-manifold topology for compression and multiresolution representation. Our method combines three approaches: subdivision surfaces...
 
Topological Segmentation in Three-Dimensional Vector Fields
Found in: IEEE Transactions on Visualization and Computer Graphics
By Karim Mahrous, Janine Bennett, Gerik Scheuermann, Bernd Hamann, Kenneth I. Joy
Issue Date:March 2004
pp. 198-205
<p><b>Abstract</b>—We present a new method for topological segmentation in steady three-dimensional vector fields. Depending on desired properties, the algorithm replaces the original vector field by a derived segmented data set, which is...
 
Material Interface Reconstruction
Found in: IEEE Transactions on Visualization and Computer Graphics
By Kathleen S. Bonnell, Mark A. Duchaineau, Daniel R. Schikore, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2003
pp. 500-511
<p><b>Abstract</b>—This paper presents an algorithm for material interface reconstruction for data sets where fractional material information is given as a percentage for each element of the underlying grid. The reconstruction problem is ...
 
Parallel Cell Projection Rendering of Adaptive Mesh Refinement Data
Found in: Parallel and Large-Data Visualization and Graphics, IEEE Symposium on
By Gunther H. Weber, Martin Öhler, Oliver Kreylos, John M. Shalf, E. Wes Bethel, Bernd Hamann, Gerik Scheuermann
Issue Date:October 2003
pp. 8
Adaptive Mesh Refinement (AMR) is a technique used in numerical simulations to automatically refine (or de-refine) certain regions of the physical domain in a finite difference calculation. AMR data consists of nested hierarchies of data grids. As AMR visu...
 
Hierarchical Clustering for Unstructured Volumetric Scalar Fields
Found in: Visualization Conference, IEEE
By Christopher S. Co, Bjoern Heckel, Hans Hagen, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2003
pp. 43
We present a method to represent unstructured scalar fields at multiple levels of detail. Using a parallelizable classification algorithm to build a cluster hierarchy, we generate a multiresolution representation of a given volumetric scalar data set. The ...
 
Interactive Protein Manipulation
Found in: Visualization Conference, IEEE
By Oliver Kreylos, Nelson L. Max, Bernd Hamann, Silvia N. Crivell, E. Wes Bethel
Issue Date:October 2003
pp. 77
We describe an interactive visualization and modeling program for the creation of protein structures
 
Iso-Splatting: A Point-Based Alternative to Isosurface Visualization
Found in: Computer Graphics and Applications, Pacific Conference on
By Christopher S. Co, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2003
pp. 325
We present a new approach to isosurface visualization that we call
 
Deploying Web-Based Visual Exploration Tools on the Grid
Found in: IEEE Computer Graphics and Applications
By T.J. Jankun-Kelly, Oliver Kreylos, Kwan-Liu Ma, Bernd Hamann, Kenneth I. Joy, John Shalf, E. Wes Bethel
Issue Date:March 2003
pp. 40-50
<p>A Web-based portal enables the exploration, encapsulation, and dissemination of visualization results over the grid. This portal integrates an interface client for structured visualization exploration, a visualization Web application to manage the...
 
Hierarchical Representation of Time-Varying Volume Data with
Found in: Computer Graphics and Applications, Pacific Conference on
By Lars Linsen, Valerio Pascucci, Mark A. Duchaineau, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2002
pp. 346
<p>Multiresolution methods for representing data at multiple levels of detail are widely used for large-scale two- and three-dimensional data sets. We present a four-dimensional multiresolution approach for time-varying volume data. This approach sup...
 
Wavelet Representation of Contour Sets
Found in: Visualization Conference, IEEE
By Martin Bertram, Daniel E. Laney, Mark A. Duchaineau, Charles D. Hansen, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2001
pp. N/A
We present a new wavelet compression and multiresolution modeling approach for sets of contours (level sets). In contrast to previous wavelet schemes, our algorithm creates parametrization of a scalar field induced by its contours and compactly stores this...
 
Interactive Display of Surfaces Using Subdivision Surfaces and Wavelets
Found in: Computer Graphics, Spring Conference on
By Mark A. Duchaineau, Martin Bertram, Serban Porumbescu, Bernd Hamann, Kenneth I. Joy
Issue Date:April 2001
pp. 0118
Abstract: Complex surfaces and solids are produced by large-scale modeling and simulation activities in a variety of disciplines. Productive interaction with these simulations requires that these surfaces or solids be viewable at interactive rates - yet ma...
 
On Simulated Annealing and the Construction of Linear Spline Approximations for Scattered Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By Oliver Kreylos, Bernd Hamann
Issue Date:January 2001
pp. 17-31
<p><b>Abstract</b>—We describe a method to create optimal linear spline approximations to arbitrary functions of one or two variables, given as scattered data without known connectivity. We start with an initial approximation consisting o...
 
Bicubic Subdivision-Surface Wavelets for Large-Scale Isosurface Representation and Visualization
Found in: Visualization Conference, IEEE
By Martin Bertram, Mark A. Duchaineau, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2000
pp. 69
We introduce a new subdivision-surface wavelet transform for arbitrary two-manifolds with boundary that is the first to use simple lifting-style filtering operations with bicubic precision. We also describe a conversion process for re-mapping large-scale i...
 
Constructing Material Interfaces From Data Sets with Volume-Fraction Information
Found in: Visualization Conference, IEEE
By Kathleen S. Bonnell, Mark A. Duchaineau, Daniel R. Schikore, Bernd Hamann, Kenneth I. Joy
Issue Date:October 2000
pp. 66
We present a new algorithm for material boundary interface reconstruction from data sets containing volume fractions. We transform the reconstruction problem to a problem that analyzes the dual data set, where each vertex in the dual mesh has an associated...
 
Reconstruction of B-Spline Surfaces from Scattered Data Points
Found in: Computer Graphics International Conference
By Benjamin Gregorski, Bernd Hamann at Kenneth I. Joy
Issue Date:June 2000
pp. 163
We present a new approach for reconstructing a smooth surface from a set of scattered points in three-dimensional (3D) space. Our algorithm first decomposes a given point set into a quadtree-like data structure known as a strip tree. The strip tree is used...
 
Multiresolution Techniques for Interactive Texture-based Volume Visualization
Found in: Visualization Conference, IEEE
By Eric C La Mar, Bernd Hamann, Kenneth I. Joy
Issue Date:October 1999
pp. 60
We present a multiresolution technique for interactive texture-based volume visualization of very large data sets. This method uses an adaptive scheme that renders the volume in a region-of-interest at a high resolution and the volume away from this region...
 
Simplification of Tetrahedral Meshes with Error Bounds
Found in: IEEE Transactions on Visualization and Computer Graphics
By Issac J. Trotts, Bernd Hamann, Kenneth I. Joy
Issue Date:July 1999
pp. 224-237
<p><b>Abstract</b>—We present a method for the construction of multiple levels of tetrahedral meshes approximating a trivariate scalar-valued function at different levels of detail. Starting with an initial, high-resolution triangulation ...
 
Simplification of Tetrahedral Meshes
Found in: Visualization Conference, IEEE
By Issac J. Trotts, Bernd Hamann, Kenneth I. Joy, David F. Wiley
Issue Date:October 1998
pp. 287
We present a method for the construction of multiple levels of tetrahedral meshes approximating a trivariate function at different levels of detail. Starting with an initial, high-resolution triangulation of a three-dimensional region, we construct coarser...
 
Constructing Hierarchies for Triangle Meshes
Found in: IEEE Transactions on Visualization and Computer Graphics
By Tran S. Gieng, Bernd Hamann, Kenneth I. Joy, Gregory L. Schussman, Issac J. Trotts
Issue Date:April 1998
pp. 145-161
<p><b>Abstract</b>—We present a method to produce a hierarchy of triangle meshes that can be used to blend different levels of detail in a smooth fashion. The algorithm produces a sequence of meshes <tmath>${\cal M}_0, {\cal M}_1, {...
 
On Approximating Contours of the Piecewise Trilinear Interpolant Using Triangular Rational-Quadratic Bézier Patches
Found in: IEEE Transactions on Visualization and Computer Graphics
By Bernd Hamann, Issac J. Trotts, Gerald E. Farin
Issue Date:July 1997
pp. 215-227
<p><b>Abstract</b>—Given a three-dimensional (3D) array of function values <it>F</it><sub><it>i</it>, <it>j</it>,<it>k</it></sub> on a rectilinear grid, the marching cubes (MC) m...
 
Multiresolution and Adaptive Rendering Techniques for Structured, Curvilinear Data
Found in: Scientific Visualization Conference
By William C. Wynn, J. Fritz Barnes, Bernd Hamann, Mark Miller
Issue Date:June 1997
pp. 332
In many applications one is concerned with techniques for visualizing data sets with real-time interaction. One technique for providing real-time performance is through the use of multiresolution techniques. These techniques provide multiple representation...
 
Cluster-Based Generation of Hierarchical Surface Models
Found in: Scientific Visualization Conference
By Bjoern Heckel, Bernd Hamann, Antonio E. Uva
Issue Date:June 1997
pp. 105
We present a highly efficient, automatic method for the generation of hierarchical surface triangulations. Given a set of scattered points in three-dimensional space, without known connectivity information, our method reconstructs a valid triangulated surf...
 
Visualization of Water Quality Data for the Chesapeake Bay
Found in: Visualization Conference, IEEE
By Adam B. Forgang, Bernd Hamann, Carl F. Cerco
Issue Date:November 1996
pp. 417
We discuss a visualization system for the comparison of simulated and measured water quality. The system extends SCIRT (Site Characterization Interactive Research Toolkit), an interactive system originally developed at the NSF Engineering Research Center f...
 
Data Reduction and Interpolation for Visualizing 3D Soil-Quality Data
Found in: Visualization Conference, IEEE
By David C. Banks, Bernd Hamann, Po-Yu Tsai, Robert Moorhead, Jonathan Barlow
Issue Date:November 1996
pp. 421
Sampling and analysis of subsurface contaminants comprise the first steps toward environmental remediation of hazardous spills. We have developed software tools to support the analysis phase, using three different schemes for interpolating scattered 3D soi...
 
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