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Transfer Function design toolbox for full-color volume datasets

Transfer Function design toolbox for full-color volume datas...

引用

Pacific (formerly Asia-Pacific APVIS) visualization symposium

作者： Martin Falk Ingrid Hotz Patric Ljung Darren Treanor Anders Ynnerman Claes Lundström Department of Science and Technology Linköpinq University Sweden Center for Medical Image Science and Visualization (CMIV) Linköping University Sweden Linkopings universitet Linkoping SE

In this paper, we tackle the challenge of effective Transfer Function (TF) design for Direct volume Rendering (DVR) of full-color datasets. We propose a novel TF design toolbox based on color similarity which is used to adjust opacity as well as replacing colors. We show that both CIE L*u*v* chromaticity and the chroma component of YC B C R are equally suited as underlying color space for the TF widgets. In order to maximize the area utilized in the TF editor, we renormalize the color space based on the histogram of the dataset. Thereby, colors representing a higher share of the dataset are depicted more prominently, thus providing a higher sensitivity for fine-tuning TF widgets. The applicability of our TF design toolbox is demonstrated by volume ray casting challenging full-color volume data including the visible male cryosection dataset and examples from 3D histology.

关键词： Image color analysis Histograms Color Rendering (computer graphics) Three-dimensional displays Data visualization Transfer functions

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Parallel Distributed, GPU-Accelerated, Advanced Lighting Calculations for Large-Scale volume visualization 6

Parallel Distributed, GPU-Accelerated, Advanced Lighting Cal...

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6th ieee symposium on Large Data Analysis and visualization (LDAV)

作者： Shih, Min Vishwanath, Venkatram Rizzi, Silvio Hereld, Mark Insley, Joseph Papka, Michael E. Uram, Thomas Ma, Kwan-Liu Univ Calif Davis Davis CA 95616 USA Argonne Natl Lab Argonne IL 60439 USA Northern Illinois Univ Argonne Natl Lab De Kalb IL 60115 USA

ISBN: (纸本)9781509056590

The benefits of applying advanced illumination models to volume visualization have been demonstrated by many researchers. For a parallel distributed, GPU computing environment, however, there is no efficient algorithm for scalable global illumination calculations. This paper presents a parallel, data-distributed and GPU-accelerated algorithm for volume rendering with advanced lighting. Our approach features tunable soft shadows for enhancing perception of complex spatial structures and relationships. For lighting calculations, our design effectively avoids data exchange among GPUs. Performance evaluation on a GPU cluster using up to 128 GPUs shows scalable rendering performance, with both the number of GPUs and volume data size.

关键词： Lighting Rendering (computer graphics) Scattering Computational modeling graphics processing units Light sources Acceleration Lighting LIGHT SOURCES graphics Processing Unit Computational modeling acceleration Scattering arithmetic visualization Parallel Lines efficient algorithm

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visualization of Origin-Destination Matrices Using a Connection Barchart and Coordinated Maps 9

Visualization of Origin-Destination Matrices Using a <i>Conn...

引用

ieee Pacific visualization symposium (ieee PacificVis)

作者： Ibarra, Juan C. Triana, John A. Hernandez, Jose T. Univ Los Andes IMAGINE Res Grp Bogota Colombia

ISBN: (纸本)9781509014514

The origin-destination matrix is an useful tool for traffic and transport analysis. This kind of matrices are increasing in volume and complexity due to the availability of new technologies to gather new information. In this project we present a novel way of representing origin-destination matrices using a connection barchart and two co-ordinated maps. The main goal is to use the connection Barchart as the center of the interactive visualization providing an overview of the dataset. Through interaction, the information about specific origin-destination nodes in the origin-destination matrix is shown in both the connection barchart and the coordinated maps, giving the user information about origin, destination, direction, and volume of flow. Additionally, an evaluation with users was conducted to test the usefulness and usability of the interactive visualization using real data for the RBT system in Bogota, Colombia.

关键词： I.3.8 [COMPUTER graphics]: Applications-Traffic and Transport Analysis

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Interactive Visual Exploration of a Trillion Particles 6

Interactive Visual Exploration of a Trillion Particles

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6th ieee symposium on Large Data Analysis and visualization (LDAV)

作者： Schatz, Karsten Mueller, Christoph Krone, Michael Schneider, Jens Reina, Guido Ertl, Thomas Univ Stuttgart Visualizat Res Ctr Stuttgart Germany King Abdullah Univ Sci & Technol Thuwal Saudi Arabia

ISBN: (纸本)9781509056590

We present a method for the interactive exploration of tera-scale particle data sets. Such data sets arise from molecular dynamics, particle-based fluid simulation, and astrophysics. Our visualization technique provides a focus+context view of the data that runs interactively on commodity hardware. The method is based on a hybrid multi-scale rendering architecture, which renders the context as a hierarchical density volume. Fine details in the focus are visualized using direct particle rendering. In addition, clusters like dark matter halos can be visualized as semi-transparent spheres enclosing the particles. Since the detail data is too large to be stored in main memory, our approach uses an out-of-core technique that streams data on demand. Our technique is designed to take advantage of a dual-GPU configuration, in which the workload is split between the GPUs based on the type of data. Structural features in the data are visually enhanced using advanced rendering and shading techniques. To allow users to easily identify interesting locations even in overviews, both the focus and context view use color tables to show data attributes on the respective scale. We demonstrate that our technique achieves interactive performance on a one trillion particle data set from the DarkSky simulation.

关键词： I.3.5 [Computer graphics]: Computational Geometry and Object Modeling-Object hierarchies J.2 [Computer Applications]: Physical Sciences and Engineering-Astronomy

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ieee symposium on Large Data Analysis and visualization 2016, LDAV 2016 - Proceedings

IEEE Symposium on Large Data Analysis and Visualization 2016...

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6th ieee symposium on Large-Scale Data Analysis and visualization, LDAV 2016

ISBN: (纸本)9781509056590

The proceedings contain 18 papers. The topics discussed include: embedded domain-specific language and runtime system for progressive spatiotemporal data analysis and visualization;SeekAView: an intelligent dimensionality reduction strategy for navigating high-dim data spaces;quantitative exploration of large medieval manuscripts data for the codicological research;parallel distributed, GPU-accelerated, advanced lighting calculations for large-scale volume visualization;interactive visual exploration of a trillion particles;in situ generated probability distribution functions for interactive post hoc visualization and analysis;parallel peak pruning for scalable SMP contour tree computation;topology-aware image compositing using NVLink;scalable rendering of large SPH simulations using an RK-enhanced interpolation scheme on constrained datasets;segmented time series visualization tool for additive manufacturing;a lightweight H.264-based hardware accelerated image compression library;statistical projections for multi-dimensional visual data exploration;formal evaluation strategies for feature tracking;and correlating sub-phenomena in performance data in the frequency domain.

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Advanced Lighting for Unstructured-Grid Data visualization 8

Advanced Lighting for Unstructured-Grid Data Visualization

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ieee Pacific visualization symposium (PacificVis)

作者： Shih, Min Zhang, Yubo Ma, Kwan-Liu Univ Calif Davis Davis CA 95616 USA

ISBN: (纸本)9781467368797

The benefits of using advanced illumination models in volume visualization have been demonstrated by many researchers. Interactive volume rendering incorporated with advanced lighting has been achieved with GPU acceleration for regular-grid volume data, making volume visualization even more appealing as a tool for 3D data exploration. This paper presents an interactive illumination strategy, which is specially designed and optimized for volume visualization of unstructured-grid data. The basis of the design is a partial differential equation based illumination model to simulate the light propagation, absorption, and scattering within the volumetric medium. In particular, a two-level scheme is introduced to overcome the challenges presented by unstructured grids. Test results show that the added illumination effects such as global shadowing and multiple scattering not only lead to more visually pleasing visualization, but also greatly enhance the perception of the depth information and complex spatial relationships for features of interest in the volume data. This volume visualization enhancement is introduced at a time when unstructured grids are becoming increasingly popular for a variety of scientific simulation applications.

关键词： I.3.7 [Computer graphics]: Three-Dimensional graphics and Realism - Color I.3.8 [Computer graphics]: Applications shading shadowing texture

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A Tangible volume for Portable 3D Interaction

A Tangible Volume for Portable 3D Interaction

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ieee International symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Paul Issartel Lonni Besançon Tobias Isenberg Mehdi Ammi LIMSI-CNRS Univ. Paris-Saclay Inria Saclay Univ. Paris-Saclay Inria Saclay

We present a new mixed reality approach to achieve tangible object manipulation with a single, fully portable, and self-contained device. Our solution is based on the concept of a “tangible volume.” We turn a tangible object into a handheld fish-tank display. Our approach, however, goes beyond traditional fish-tank VR in that it can be viewed from all sides, and that the tangible volume represents a volume of space that can be freely manipulated within a virtual scene. This volume can be positioned onto virtual objects to directly grasp them and to manipulate them in 3D space. We investigate this concept with a user study to evaluate the intuitiveness of using a tangible volume for grasping and manipulating virtual objects. The results show that a majority of participants spontaneously understood the idea of grasping a virtual object “through” the tangible volume.

关键词： Three-dimensional displays Mobile handsets visualization Rendering (computer graphics) Shape User interfaces Virtual reality

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Interactive visual exploration of a trillion particles

Interactive visual exploration of a trillion particles

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ieee symposium on Large Data Analysis and visualization (LDAV)

作者： Karsten Schatz Christoph Müller Michael Krone Jens Schneider Guido Reina Thomas Ertl Visualization Research Center University of Stuttgart Germany King Abdullah University of Science and Technology Saudi Arabia

ISBN: (纸本)9781509056606

关键词： Data models Data visualization Rendering (computer graphics) Computational modeling visualization Context Hardware

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Computation-to-Core Mapping Strategies for Iso-Surface volume Rendering on GPUs 8

Computation-to-Core Mapping Strategies for Iso-Surface Volum...

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ieee Pacific visualization symposium (PacificVis)

作者： Wang, Junpeng Yang, Fei Cao, Yong Virginia Tech Blacksburg VA 24061 USA NVIDIA Santa Clara CA USA

ISBN: (纸本)9781467368797

Ray casting algorithm is a major component of the direct volume rendering, which exhibits inherent parallelism, making it suitable for graphics processing units (GPUs). However, blindly mapping the ray casting algorithm on a GPU's complex parallel architecture can result in a magnitude of performance loss. In this paper, a novel computation-to-core mapping strategy, called Warp Marching, for the texture-based iso-surface volume rendering is introduced. We evaluate and compare this new strategy with the most commonly used existing mapping strategy. Texture cache performance and load balancing are the two major evaluation factors since they have significant consequences on the overall rendering performance. Through a series of real-life data experiments, we conclude that the texture cache performances of these two computation-to-core mapping strategies are significantly affected by the viewing direction;and the Warp Marching performs better in balancing workloads among threads and concurrent hardware components of a GPU.

关键词： graphics processing unit

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Streaming Ultra High Resolution Images to Large Tiled Display at Nearly Interactive Frame Rate with vl3 5

Streaming Ultra High Resolution Images to Large Tiled Displa...

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ieee 5th symposium on Large Data Analysis and visualization (LDAV)

作者： Jiang, Jie Hereld, Mark Insley, Joseph Papka, Michael E. Rizzi, Silvio Uram, Thomas Vishwanath, Venkatram Univ Illinois Chicago IL 60607 USA Argonne Natl Lab Argonne IL 60439 USA Northern Illinois Univ De Kalb IL USA

ISBN: (纸本)9781467385176

visualization of large-scale simulations running on supercomputers requires ultra-high resolution images to capture important features in the data. In this work, we present a system for streaming ultra-high resolution images from a visualization cluster to a remote tiled display at nearly interactive frame rates. vl3, a modular framework for large scale data visualization and analysis, provides the backbone of our implementation. With this system we are able to stream over the network volume renderings of a 2048(3) voxel dataset at a resolution of 6144x3072 pixels with a frame rate of approximately 3.3 frames per second.

关键词： I.3.1 [Computing Methodologies]: Computer graphics ??? Hardware Architecture: Parallel Processing I.3.2 [Computing Methodologies]: Computer graphics ??? graphics Systems: Distributed/network graphic Frame Rate image resolution Streaming Resolving power supercomputer visualization Interactive images pixel Frame High definition

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