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Displaying 1-13 out of 13 total
Efficient Local Statistical Analysis via Integral Histograms with Discrete Wavelet Transform
Found in: IEEE Transactions on Visualization and Computer Graphics
By Teng-Yok Lee,Han-Wei Shen
Issue Date:December 2013
pp. 2693-2702
Histograms computed from local regions are commonly used in many visualization applications, and allowing the user to query histograms interactively in regions of arbitrary locations and sizes plays an important role in feature identification and tracking....
 
An Information-Theoretic Framework for Flow Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Lijie Xu, Teng-Yok Lee, Han-Wei Shen
Issue Date:November 2010
pp. 1216-1224
The process of visualization can be seen as a visual communication channel where the input to the channel is the raw data, and the output is the result of a visualization algorithm. From this point of view, we can evaluate the effectiveness of visualizatio...
 
Visualization and Exploration of Temporal Trend Relationships in Multivariate Time-Varying Data
Found in: IEEE Transactions on Visualization and Computer Graphics
By Teng-Yok Lee, Han-Wei Shen
Issue Date:November 2009
pp. 1359-1366
We present a new algorithm to explore and visualize multivariate time-varying data sets. We identify important trend relationships among the variables based on how the values of the variables change over time and how those changes are related to each other...
 
Efficient Range Distribution Query for Visualizing Scientific Data
Found in: 2014 IEEE Pacific Visualization Symposium (PacificVis)
By Abon Chaudhuri, Tzu Hsuan Wei, Teng Yok Lee, Han Wei Shen,Tom Peterka
Issue Date:March 2014
pp. 201-208
Visualization applications implicitly run queries on the data to retrieve distributions and statistical measures derivable from distributions. Distribution based data summaries can substitute for the raw data to answer statistical queries of different kind...
 
Parallel particle advection and FTLE computation for time-varying flow fields
Found in: 2012 SC - International Conference for High Performance Computing, Networking, Storage and Analysis
By Boonthanome Nouanesengsy,Teng-Yok Lee,Kewei Lu,Han-Wei Shen,Tom Peterka
Issue Date:November 2012
pp. 1-11
Flow fields are an important product of scientific simulations. One popular flow visualization technique is particle advection, in which seeds are traced through the flow field. One use of these traces is to compute a powerful analysis tool called the Fini...
 
A flow-guided file layout for out-of-core streamline computation
Found in: Visualization Symposium, IEEE Pacific
By Chun-Ming Chen,Lijie Xu,Teng-Yok Lee,Han-Wei Shen
Issue Date:March 2012
pp. 145-152
We present a file layout algorithm for flow fields to improve runtime I/O efficiency for out-of-core streamline computation. Because of the increasing discrepancy between the speed of processors and storage devices, the cost of I/O becomes a major bottlene...
 
Load-Balanced Parallel Streamline Generation on Large Scale Vector Fields
Found in: IEEE Transactions on Visualization and Computer Graphics
By Boonthanome Nouanesengsy,Teng-Yok Lee,Han-Wei Shen
Issue Date:December 2011
pp. 1785-1794
Because of the ever increasing size of output data from scientific simulations, supercomputers are increasingly relied upon to generate visualizations. One use of supercomputers is to generate field lines from large scale flow fields. When generating field...
 
A Study of Parallel Particle Tracing for Steady-State and Time-Varying Flow Fields
Found in: Parallel and Distributed Processing Symposium, International
By Tom Peterka,Robert Ross,Boonthanome Nouanesengsy,Teng-Yok Lee,Han-Wei Shen,Wesley Kendall,Jian Huang
Issue Date:May 2011
pp. 580-591
Particle tracing for streamline and path line generation is a common method of visualizing vector fields in scientific data, but it is difficult to parallelize efficiently because of demanding and widely varying computational and communication loads. In th...
 
View point evaluation and streamline filtering for flow visualization
Found in: 2011 IEEE Pacific Visualization Symposium (PacificVis)
By Teng-Yok Lee,Oleg Mishchenko, Han-Wei Shen,Roger Crawfis
Issue Date:March 2011
pp. 83-90
Visualization of flow fields with geometric primitives is often challenging due to occlusion that is inevitably introduced by 3D streamlines. In this paper, we present a novel view-dependent algorithm that can minimize occlusion and reveal important flow f...
 
Visualizing time-varying features with TAC-based distance fields
Found in: Visualization Symposium, IEEE Pacific
By Teng-Yok Lee, Han-Wei Shen
Issue Date:April 2009
pp. 1-8
To analyze time-varying data sets, tracking features over time is often necessary to better understand the dynamic nature of the underlying physical process. Tracking 3D time-varying features, however, is non-trivial when the boundaries of the features can...
 
Exploring Flow Fields Using Space-filling Analysis of Streamlines
Found in: IEEE Transactions on Visualization and Computer Graphics
By Abon Chaudhuri,Teng-Yok Lee,Han-Wei Shen,Rephael Wenger
Issue Date:March 2014
pp. 1
Large scale scientific simulations frequently use streamline based techniques to visualize flow fields. As the shape of a streamline is often related to some underlying property of the field, it is important to identify streamlines (or their parts) with un...
 
Efficient Local Statistical Analysis via Integral Histograms with Discrete Wavelet Transform
Found in: IEEE Transactions on Visualization and Computer Graphics
By Teng-Yok Lee, Han-Wei Shen
Issue Date:December 2013
pp. 2693-2702
Histograms computed from local regions are commonly used in many visualization applications, and allowing the user to query histograms interactively in regions of arbitrary locations and sizes plays an important role in feature identification and tracking....
 
Feature Tracking and Visualization of the Madden-Julian Oscillation in Climate Simulation
Found in: IEEE Computer Graphics and Applications
By Teng-Yok Lee, Xin Tong, Han-Wei Shen, Pak Chung Wong,S. Hagos,L. R. Leung
Issue Date:July 2013
pp. 29-37
The Madden-Julian oscillation (MJO) is one of the less understood aspects of tropical meteorology. It plays a significant role in tropical intraseasonal variations in rain, temperature, and winds over the Indian and Pacific Oceans. Researchers have develop...
 
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