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Displaying 1-13 out of 13 total
A sampling theorem for MLS surfaces
Found in: Proceedings Eurographics/IEEE VGTC Symposium Point-Based Graphics
By P.-T. Bremer, J.C. Hart
Issue Date:June 2005
pp. 47-54
Recently, point set surfaces has been the focus of a large number of research efforts. Several different methods have been proposed to define surfaces from points and have been used in a variety of applications. However, so far little is know about the mat...
A Practical Approach to Morse-Smale Complex Computation: Scalability and Generality
Found in: IEEE Transactions on Visualization and Computer Graphics
By A. Gyulassy,P.-T. Bremer,B. Hamann,V. Pascucci
Issue Date:November 2008
pp. 1619-1626
The Morse-Smale (MS) complex has proven to be a useful tool in extracting and visualizing features from scalar-valued data. However, efficient computation of the MS complex for large scale data remains a challenging problem. We describe a new algorithm and...
Interactive Exploration and Analysis of Large-Scale Simulations Using Topology-Based Data Segmentation
Found in: IEEE Transactions on Visualization and Computer Graphics
By P-T Bremer,G. Weber,J. Tierny,V. Pascucci,M. Day,J. Bell
Issue Date:September 2011
pp. 1307-1324
Large-scale simulations are increasingly being used to study complex scientific and engineering phenomena. As a result, advanced visualization and data analysis are also becoming an integral part of the scientific process. Often, a key step in extracting i...
Interpreting Performance Data across Intuitive Domains
Found in: 2011 International Conference on Parallel Processing
By M. Schulz,J. A. Levine,P-T Bremer,T. Gamblin,V. Pascucci
Issue Date:September 2011
pp. 206-215
To exploit the capabilities of current and future systems, developers must understand the interplay between on-node performance, domain decomposition, and an application's intrinsic communication patterns. While tools exist to gather and analyze data for e...
Analyzing and Tracking Burning Structures in Lean Premixed Hydrogen Flames
Found in: IEEE Transactions on Visualization and Computer Graphics
By P.-T. Bremer,G.H. Weber,V. Pascucci,M. Day,J.B. Bell
Issue Date:March 2010
pp. 1-1
This paper presents topology-based methods to robustly extract, analyze, and track features defined as subsets of isosurfaces. First, we demonstrate how features identified by thresholding isosurfaces can be defined in terms of the Morse complex. Second, w...
A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion
Found in: 2009 5th IEEE International Conference on e-Science (e-Science 2009)
By P.-T. Bremer,G.H. Weber,J. Tierny,V. Pascucci,M.S. Day,J.B. Bell
Issue Date:December 2009
pp. 247-254
The advent of highly accurate, large scale volumetric simulations has made data analysis and visualization techniques an integral part of the modern scientific process. To develop new insights from raw data, scientists need the ability to define features o...
Visualization Corner: Robust Topology-Based Multiscale Analysis of Scientific Data
Found in: Computing in Science & Engineering
By A. Gyulassy,L.G. Nonato,P.-T. Bremer,C. Silva,V. Pascucci
Issue Date:September 2009
pp. 88-95
During multiscale analysis, hierarchical function decompositions and error-driven simplifications can't guarantee precise control of topological features. Topology-based multiscale analysis has emerged as an alternative to help researchers understand compl...
Hybrid CPU-GPU Solver for Gradient Domain Processing of Massive Images
Found in: 2011 IEEE 17th International Conference on Parallel and Distributed Systems (ICPADS 2011)
By S. Philip,B. Summa,V. Pascucci,P-T Bremer
Issue Date:December 2011
pp. 244-251
Gradient domain processing is a computationally expensive image processing technique. Its use for processing massive images, giga or terapixels in size, can take several hours with serial techniques. To address this challenge, parallel algorithms are being...
A Multi-resolution Data Structure for Two-dimensional Morse-Smale Functions
Found in: Visualization Conference, IEEE
By P.-T. Bremer, H. Edelsbrunner, B. Hamann, V. Pascucci
Issue Date:October 2003
pp. 19
We combine topological and geometric methods to construct a multi-resolution data structure for functions over two-dimensional domains. Starting with the Morse-Smale complex, we construct a topological hierarchy by progressively canceling critical points i...
Ensemble-Vis: A Framework for the Statistical Visualization of Ensemble Data
Found in: 2009 IEEE International Conference on Data Mining Workshops (ICDMW 2009)
By K. Potter,A. Wilson,P.-T. Bremer,D. Williams,C. Doutriaux,V. Pascucci,C.R. Johnson
Issue Date:December 2009
pp. 233-240
Scientists increasingly use ensemble data sets to explore relationships present in dynamic systems. Ensemble data sets combine spatio-temporal simulation results generated using multiple numerical models, sampled input conditions and perturbed parameters. ...
Adaptive Extraction and Quantification of Geophysical Vortices
Found in: IEEE Transactions on Visualization and Computer Graphics
By S. Williams,M. Petersen,P.-T Bremer,M. Hecht,V. Pascucci,J. Ahrens,M. Hlawitschka,B. Hamann
Issue Date:December 2011
pp. 2088-2095
We consider the problem of extracting discrete two-dimensional vortices from a turbulent flow. In our approach we use a reference model describing the expected physics and geometry of an idealized vortex. The model allows us to derive a novel correlation b...
Understanding the Structure of the Turbulent Mixing Layer in Hydrodynamic Instabilities
Found in: IEEE Transactions on Visualization and Computer Graphics
By D. Laney,P.-T. Bremer,A. Mascarenhas,P. Miller,V. Pascucci
Issue Date:September 2006
pp. 1053-1060
When a heavy fluid is placed above a light fluid, tiny vertical perturbations in the interface create a characteristic structure of rising bubbles and falling spikes known as Rayleigh-Taylor instability. Rayleigh-Taylor instabilities have received much att...
Topological Landscapes: A Terrain Metaphor for Scientific Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By G.H. Weber,P.-T. Bremer,V. Pascucci
Issue Date:November 2007
pp. 1416-1423
Scientific visualization and illustration tools are designed to help people understand the structure and complexity of scientific data with images that are as informative and intuitive as possible. In this context the use of metaphors plays an important ro...