KWAN-LIU MA


PUBLICATIONS

(A more complete list can be seen at DBLP.)

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A Model for the Visualization Exploration Process

T.J. Jankun-Kelly, Kwan-Liu Ma, and Michael Gertz

In Proceedings of IEEE Visualization 2002 Conference
October/November, 2002, pp. 323-330

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The current state of the art in visualization research places a strong emphasis on different techniques to derive insight from disparate types of data. However, little work has investigated the visualization process itself. The information content of the visualization process—the results, history, and relationships between those results—is addressed by this work. A characterization of the visualization process is discussed, leading to a general model of the visualization exploration process ...

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Kinetic Visualization: A Technique for Illustrating 3D Shape and Structure

Eric Lum, Aleksander Stompel, and Kwan-Liu Ma

In Proceedings of IEEE Visualization 2002 Conference
October/November, 2002, pp. 435-442

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Motion provides strong visual cues for the perception of shape and depth, as demonstrated by cognitive scientists and visual artists. This paper presents a novel visualization technique – kinetic visualization-that uses particle systems to add supplemental motion cues which can aid in the perception of shape and spatial relationships of static objects. Based on a set of rules following perceptual and physical principles, particles flowing over the surface of an object not only bring out, but also attract attention to, essential information on the shape of the object that might not be readily visible with conventional rendering that uses lighting and view changes ...

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Case Study: Interactive Visualization for Internet Security

Soon Tee Teoh, Kwan-Liu Ma, S. Felix Wu, and Xiaoliang Zhao

In Proceedings of IEEE Visualization 2002 Conference
October/November, 2002, pp. 505-508

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Internet connectivity is defined by a set of routing protocols which let the routers that comprise the Internet backbone choose the best route for a packet to reach its destination. One way to improve the security and performance of Internet is to routinely examine the routing data. In this case study, we show how interactive visualization of Border Gateway Protocol (BGP) data helps characterize routing behavior, identify weaknesses in connectivity which could potentially cripple the ...

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ISpace: Interactive Volume Data Classification Techniques Using Independent Component Analysis

Ikuko Takanashi, Eric Lum, Kwan-Liu Ma, and Shigeru Muraki

In Proceedings of Pacific Graphics 2002 Conference
October, 2002, pp. 366-374

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This paper introduces an interactive classification technique for volume data, called ISpace, which uses Independent Component Analysis (ICA) and a multidimensional histogram of the volume data in a transformed space. Essentially, classification in the volume domain becomes equivalent to interactive clipping in the ICA space, which as demonstrated using several examples is more intuitive and direct for the user to classify data ...

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Visualization of Multidimensional, Multivariate Volume Data Using Hardware-accelerated Non-photorealistic Rendering Techniques

Aleksander Stompel, Eric Lum, and Kwan-Liu Ma

In Proceedings of Pacific Graphics 2002 Conference
October, 2002, pp. 1-8

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This paper presents a set of feature enhancement techniques coupled with hardware-accelerated nonphotorealistic rendering for generating more perceptually effective visualizations of multidimensional, multivariate volume data, such as those obtained from typical computational fluid dynamics simulations. For time-invariant data, one or more variables are used to either highlight important features in another variable, or add contextural information to the visualization. For time-varying data, rendering of each time step also takes into account the values at neighboring time steps to reinforce the perception of the changing features in the data over time ...

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Scalable Self-Orienting Surfaces: A Compact, Texture-Enhanced Representation for Interactive Visualization of 3D Vector Fields

Greg Schussman and Kwan-Liu Ma

In Proceedings of Pacific Graphics 2002 Conference
October, 2002, pp. 356-365

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This paper presents a study of field line visualization techniques.
To address both the computational and perceptual issues in visualizing large scale, complex, dense field line data commonly found in many scientific applications, a new texture-based field line representation which we call selforienting surfaces is introduced. This scalable representation facilitates hardware-accelerated rendering and incorporation of various perceptually-effective techniques, resulting in intuitive visualization and interpretation of the data under study ...

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A Hardware-Assisted Hybrid Rendering Technique for Interactive Volume Visualization

Brett Wilson, Kwan-Liu Ma, and Patrick McCormick

In Proceedings of IEEE/ACM 2002 Volume Visualization and Graphics Symposium
October, 2002, pp. 123-130

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The scientific simulation and three-dimensional imaging systems in use today are producing large quantities of data that range from gigabytes to petabytes in size. Direct volume rendering, using hardware-based three-dimensional textures, is a common technique for interactively exploring these data sets. The most serious drawback of this approach is the finite amount of available texture memory. In this paper we introduce a hybrid volume rendering technique based on the use of hardware texture mapping and pointbased rendering ...

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A Visual Technique for Internet Anomaly Detection

Soon Tee Teoh, Kwan-Liu Ma, S. Felix Wu, and Xiaoliang Zhao

In Proceedings of Fifth IASTED International Conference, Computer Graphics and Imaging
August, 2002, pp. 194-199

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The Internet can be made more secure and efficient with effective anomaly detection. In this paper, we describe a visual method for anomaly detection using archived Bor der Gateway Protocol (BGP) data. A special encoding of IP addresses built into an interactive visual interface de sign allows a user to quickly detect anomalous Origin AS changes by browsing through visual representations of se lected aspects of the data ...

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Interactivity is the Key to Expressive Visualization

Eric Lum and Kwan-Liu Ma

ACM SIGGRAPH Computer Graphics Quarterly
Volume 36, Number 3, August, 2002, pp. 5-9

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Scientific visualization is widely used for gaining insight into phenomena through data exploration and creating imagery that can be used to illustrate these phenomena to others. Interactive rendering has long been valued in visualization as a means of facilitating more effective exploration. More recently, non-photorealistic rendering (NPR) has been applied to scientific visualization, which consists of using artistically inspired techniques for the creation of more expressive visualizations ...

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A Hardware-Assisted Scalable Solution for Interactive Volume Rendering of Time-Varying Data

Eric Lum, Kwan-Liu Ma, and John Clyne

IEEE Transactions on Visualization and Graphics
Volume 8, Number 3, July, 2002, pp. 286-301

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We present a scalable volume rendering technique that exploits lossy compression and low-cost commodity hardware to permit highly interactive exploration of time-varying scalar volume data. A palette-based decoding technique and an adaptive bit allocation scheme are developed to fully utilize the texturing capability of a commodity 3-D graphics card. Using a single PC equipped with a modest amount of memory, a texture capable graphics card, and an inexpensive disk array, we are able to render hundreds of time steps of regularly gridded volume data (up to 42 millions voxels each time step) at interactive rates ...

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Recent Advances in Non-Photorealistic Rendering for Art and Visualization

Kwan-Liu Ma, Aaron Hertzmann, and Victoria Interrante and Eric Lum

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July, 2002

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This course gives a concise introduction to non-photorealistic rendering (NPR): generation of artistic imagery and perceptually effective scientific visualization. The lecturers will deliver working knowledge of fundamental NPR techniques and some of the advanced approaches at the forefront of NPR research. Topics include the relevance of visual perception and artistic techniques to NPR, brush-stroke rendering, paint-inspired techniques, hardware-accelerated NPR, and parallel NPR. ...

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Virtual Clay Modeling Using Adaptive Distance Fields

Peer-Timo Bremer, Serban D. Porumbescu, Falko Kuester, Bernd Hamann, Kenneth I. Joy, and Kwan-Liu Ma

In Proceedings of 2002 International Conference on Imaging Science, Systems, and Technology (CISST 2002)
June, 2002, pp. 627-632

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This paper describes an approach for the parametrization and modeling of objects represented by adaptive distance fields (ADFs). ADFs support the construction of powerful solid modeling tools. They can represent surfaces of arbitrary and even changing topology, while providing a more intuitive user interface than control-point based structures such as B-splines. Using the octree structure, an adaptively refined quadrilateral mesh is constructed that is topologically equivalent to the surface ...

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Hardware-Accelerated Parallel Non-Photorealistic Volume Rendering

Eric Lum and Kwan-Liu Ma

In Proceedings of International Symposium on Non-Photorealistic Animation and Rendering (NPAR 2002)
June, 2002, pp. 67-74

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Non-photorealistic rendering can be used to illustrate subtle spatial relationships that might not be visible with more realistic rendering techniques. We present a parallel hardware-accelerated rendering technique, making extensive use of multi-texturing and paletted textures, for the interactive non-photorealistic visualization of scalar volume data. With this technique, we can render a 512512512 volume using non-photorealistic techniques that include tone-shading, silhouettes, gradient-based enhancement, and color depth cueing, as shown in the images on the color plate, at multiple frames second ...

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VG Cluster: A Low-Cost Solution for Large-Scale Volume Visualization

Shigeru Muraki, Masato Ogata, Eric Lum, Xuezhen Liu, and Kwan-Liu Ma

In Proceedings of NICOGRAPH International Conference
May, 2002, pp. 31-34

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The VG cluster is a Linux PC cluster with a high-speed network interconnect, a hardware compositor, and a parallel volume renderer with highly optimized system software ...

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RINGS: A Technique for Visualizing Large Hierarchies

Soon Tee Teoh and Kwan-Liu Ma

In Proceedings of Graph Drawing Conference
April, 2002, pp. 268-275

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We present RINGS, a technique for visualizing large trees with hundreds of thousands of nodes. We introduce a new ringed circular layout of nodes to make more efficient use of limited display space. RINGS provides the user with the means to specify areas of primary and secondary focus, and is able to show multiple foci without compromising understanding of the graph ...

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Interactive Visualization of Particle Beams for Accelerator Design

Brett Wilson, Kwan-Liu Ma, Ji Qiang, and Robert Ryne

International Conference on Computational Science and Lecture Notes in Computer Science
Volume 2331, April, 2002, pp. 352-361

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We describe a hybrid data-representation and rendering technique for visualizing large-scale particle data generated from numerical modeling of beam dynamics. The basis of the technique is mixing volume rendering and point rendering according to particle density distribution, visibility, and the user's instruction. A hierarchical representation of the data is created on a parallel computer, allowing real-time partitioning into high-density areas for volume rendering, and low-density areas for point rendering ...

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Interactive Multi-Volume Visualization

Brett Wilson, Eric Lum, and Kwan-Liu Ma

International Conference on Computational Science and Lecture Notes in Computer Science
Volume 2330, April, 2002, pp. 102-110

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This paper is concerned with simultaneous visualization of two or more volumes, which may be from different imaging modalities or numerical simulations for the same subject of study. The main visualization challenge is to establish visual correspondences while maintaining distinctions among multiple volumes. One solution is to use different rendering styles for different volumes. Interactive rendering is required so the user can choose with ease an appropriate rendering style and its associated parameters for each volume ...

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Segmentation and 3D Visualization of High-Resolution Human Brain Cryosections

Ikuko Takanashi, Eric Lum, Kwan-Liu Ma, Joerg Meyer, Bernd Hamann, and Arthur J. Olson

In Proceedings of Visualization and Data Analysis
January, 2002, pp. 55-61

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We present a semi-automatic technique for segmenting a large cryo-sliced human brain data set that contains 753 highresolution RGB color images. This human brain data set presents a number of unique challenges to segmentation and visualization due to its size (over 7 GB) as well as the fact that each image not only shows the current slice of the brain but also unsliced "deeper layers" of the brain ...

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Advanced Visualization Technology for Terascale Particle Accelerator Simulations

Kwan-Liu Ma, Greg Schussman, Brett Wilson, Kwok Ko, Ji Qiang, and Robert Ryne

In Proceedings of Supercomputing 2002 Conference
November, 2002, pp. 19-30

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This paper presents two new hardware-assisted rendering techniques developed for interactive visualization of the terascale data generated from numerical modeling of extgeneration accelerator designs. The first technique, based on a hybrid rendering approach, makes possible interactive exploration of large-scale particle data from particle beam dynamics modeling. The second technique, based on a compact texture-enhanced representation, exploits the advanced features of commodity graphics cards to achieve perceptually effective visualization of the very dense and complex ...

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An Interactive Segmentation & Visualization Technique for Multispectral Volume Data

Ikuko Takanashi, Shigeru Muraki, Eric Lum, and Kwan-Liu Ma

Journal of the Institute of Image Information and Television Engineers
Volume 56, Number 6, 2002, pp. 963-972

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