DevLan/vispubs huggingface dataset:
Approximation and rendering of volume data using wavelet transforms
Authors: Shigeru Muraki
Published at Vis, 1992

A method is presented to obtain a unique shape description of an object by using wavelet transforms. Wavelet transform is a signal analysis technique which decomposes a signal using a family of functions having a local property in both time and frequency domains. A multiresolution expression of 3D volume data was first obtained by applying 3D orthogonal wavelet transforms, with the shape then being approximated with a relatively small number of 3D orthogonal functions using only the significant functions. In addition, the resolution of the approximation can be varied point by point using the local property of the wavelets. The method is applied to real volume data, i.e. facial range data and MR images of a human head, and typical results are shown.&lt;&lt;ETX&gt;&gt;
Automated design of virtual worlds for visualizing multivariate relations
Authors: Clifford Beshers, Steven K. Feiner
Published at Vis, 1992

Interactive visualization systems provide a powerful means to explore complex data, especially when coupled with 3-D interaction and display devices to produce virtual worlds. While designing a quality static 2-D visualization is already a difficult task for most users, designing an interactive 3-D one is even more challenging. To address this problem, AutoVisual, a research system that designs interactive virtual worlds for visualizing and exploring multivariate relations of arbitrary arity, is being developed. AutoVisual uses worlds within worlds, an interactive visualization technique that exploits nested, heterogeneous coordinate systems to map multiple variables onto each spatial dimension. AutoVisual's designs are guided by user-specified visualization tasks, and by a catalog of design principles encoded using a rule-based language.&lt;&lt;ETX&gt;&gt;
Case study: visualizing classical problems in CFD
Authors: Norman J. Zabusky, Deborah Silver
Published at Vis, 1992

A brief example of the visualization and quantification of a complex fluid interaction is presented in order to give one a feeling for the difficulty of dealing with geometrical and topological questions in three dimensions and time. To obtain a quantitative understanding, visiometric techniques, including thresholding, object isolation, ellipsoid fitting, abstraction, vector field line generation and data juxtaposition, were used.&lt;&lt;ETX&gt;&gt;
Color, change, and control of quantitative data display
Authors: Penny Rheingans
Published at Vis, 1992

Calico, a dynamic tool for the creation and manipulation of color mappings for the exploration of multivariate, quantitative data, was used to study the effects of user control and smooth change on user preference, accuracy, and confidence. The results of the study, as well as other user experiences with Calico, support the hypothesis that dynamic manipulation of color mappings is a useful feature of systems for the exploration of quantitative data using color. The main effect observed is a clear user preference for representations providing control over the mapping, a small but significant increase in accuracy, and greater confidence in information gleaned from manipulable displays. A smaller and less consistent effect showed greater user preference for an confidence in representations which provided smooth change between images.&lt;&lt;ETX&gt;&gt;
Constructing stream surfaces in steady 3D vector fields
Authors: Jeff P. Hultquist
Published at Vis, 1992

Maintenance of a front of particles, an efficient method of generating a set of sample points over a two-dimensional stream surface, is described. The particles are repeatedly advanced a short distance through the flow field. New polygons are appended to the downstream edge of the surface. The spacing of the particles is adjusted to maintain an adequate sampling across the width of the growing surface. Curve and ribbon methods of vector field visualization are reviewed.&lt;&lt;ETX&gt;&gt;
Direct volumetric visualization
Authors: R. D. Williams, Fred L. Wefer, Tip E. Clifton III
Published at Vis, 1992

The need for direct volume visualization display devices is discussed, as well as some specifics of the Texas Instruments OmniView technology. The topics discussed include the concept of operations, the rotating surface, the display volume, the transport theory model, the image quality in the display, and applications. The outlook for future volumetric displays is addressed.&lt;&lt;ETX&gt;&gt;
Display of scientific data structures for algorithm visualization
Authors: Bill Hibbard, Charles R. Dyer, Brian E. Paul
Published at Vis, 1992

A technique for defining graphical depictions for all the data types defined in an algorithm is presented. The ability to display arbitrary combinations of an algorithm's data objects in a common frame of reference, coupled with interactive control of algorithm execution, provides a powerful way to understand algorithm behavior. Type definitions are constrained so that all primitive values occurring in data objects are assigned scalar types. A graphical display, including user interaction with the display, is modeled by a special data type. Mappings from the scalar types into the display model type provide a simple user interface for controlling how all data types are depicted, without the need for type-specific graphics logic.&lt;&lt;ETX&gt;&gt;
Flow visualization as a basic tool to investigate the dynamics and topology of jets
Authors: Fernando Grinstein, Upul Obeysekare, Gopal Patnaik
Published at Vis, 1992

Issues and difficulties involved in the practical implementation of flow visualization techniques based on a database generated in numerical simulations of unsteady square jets are addressed. Instantaneous visualizations provide basic information on the topological features of the flow, while animation of these visualizations gives an insight into the detailed dynamics of formation, development, and interaction of the coherent structures controlling the entrainment and mixing processes.&lt;&lt;ETX&gt;&gt;
Four-dimensional views of 3D scalar fields
Authors: Andrew J. Hanson, Pheng-Ann Heng
Published at Vis, 1992

Scalar functions of three variables, w=f(x, y, z), are common in many types of scientific and medical applications. Such 3D scalar fields can be understood as elevation maps in four dimensions, with three independent variables (x, y, z) and a fourth, dependent, variable w that corresponds to the elevations. It is shown how techniques developed originally for the display of 3-manifolds in 4D Euclidean space can be adapted to visualize 3D scalar fields in a variety of ways.&lt;&lt;ETX&gt;&gt;
Generalized focal surfaces: a new method for surface interrogation
Authors: Hans Hagen, Stefanie Hahmann
Published at Vis, 1992

The generation of smooth surfaces from a mesh of three-dimensional data points is an important problem in geometric modeling. Apart from the pure construction of these curves and surfaces, the analysis of their quality is equally important in the design and manufacturing process. Generalized focal surfaces are presented as a new surface interrogation tool.&lt;&lt;ETX&gt;&gt;
Grand challenge problems in visualization software
Authors: Lloyd A. Treinish, David M. Butler, Hikmet Senay, Georges G. Grinstein, Steve T. Bryson
Published at Vis, 1992

Discusses issues relating to the complexity of scientific visualization software system implementation. It is argued that the complexity of current implementations of such systems may limit the utility for users because the interfaces typically require significant knowledge of the data being studied and the applicable visualization algorithms, as well as its infrastructure of graphics, imaging and data handling technology. The issues, unknowns, and possible solutions associated with building effective scientific visualization software are discussed.&lt;&lt;ETX&gt;&gt;
Improving the visualization of hierarchies with treemaps: design issues and experimentation
Authors: David Turo, B. Johnson
Published at Vis, 1992

Controlled experiments with novice treemap users and real data highlight the strengths of treemaps and provide direction for improvement. Issues discussed include experimental results, layout algorithms, nesting offsets, labeling, animation, and small multiple displays. Treemaps prove to be a potent tool for hierarchy display. The principles discussed are applicable to many information visualization situations.&lt;&lt;ETX&gt;&gt;
Improving visualization: theoretical and empirical foundations
Authors: Stephen M. Kosslyn, Nahum D. Gershon, Haim Levkowitz, Justin D. Pearlman
Published at Vis, 1992

Discusses the ways in which the understanding of visual perception could help improve the scientific visualization process. It is argued that as long as there is a human interface link to computer visualization systems, understanding how humans perceive information visually could help improve the quality and the effectiveness of the visualization process. The fields of visual physiology, psychophysics, and cognitive psychology can explain why human vision is so efficient, how to create better images, and how to determine the limitations of particular representations.&lt;&lt;ETX&gt;&gt;
Interactive splatting of nonrectilinear volumes
Authors: Peter L. Williams
Published at Vis, 1992

Various techniques are described for achieving interactive direct volume rendering of nonrectilinear data sets using fast projection (splatting) methods. The use of graphics hardware, rendering approximations, parallelization and reduced resolution meshes are discussed. Results from the use of these techniques are presented in the form of color photos and comparative timings.&lt;&lt;ETX&gt;&gt;
Interactive terrain rendering and volume visualization on the Princeton Engine
Authors: James T. Kaba, James R. Matey, Gordon Stoll, Herb Taylor, Pat Hanrahan
Published at Vis, 1992

The implementation of truly interactive volume visualization and terrain rendering algorithms on the Princeton Engine (PE) video supercomputer is described. The PE is a single-instruction multiple-data (SIMD) computer. Since it was originally developed as a real-time digital television system simulator, it possesses many of the attributes necessary for interactive visualization: high-resolution displays, high-bandwidth I/O, supercomputer class computational performance, and a local memory array large enough to store multiple Landsat scenes and data volumes. It is shown that it is possible to generate truly interactive terrain rendering and volume visualization by computing images in real-time, at multiple frames/second.&lt;&lt;ETX&gt;&gt;
Interactive visualization of large scalar voxel fields
Authors: Georgios Sakas, J. Hartig
Published at Vis, 1992

A technique is given allowing interactive visualization of large, scalar, discrete volume fields as semitransparent clouds 'on the fly', i.e. without preprocessing. Interactivity is not restricted to geometric transformations, but includes all possible methods of processing the data. The system flexibly trades-off quality for performance at any desirable level. In particular, by using a scanline based method and a DDA-based traversing scheme instead of ray-tracing one achieves real-time processing during previewing. By means of the 'pyramidal volume' traversing technique, one achieves high-quality, constant-time filtering, independent of the data resolution. Several filters help to detect 'fuzzy', obscured hot spots, even within noisy data. The visualization pipeline allows the application of filters at four different stages, maximizing their flexibility. Four different illumination models have been implemented.&lt;&lt;ETX&gt;&gt;
Logical time in visualizations produced by parallel programs
Authors: Janice E. Cuny, Alfred Hough, Joydip Kunda
Published at Vis, 1992

Techniques that manipulate logical time in order to produce coherent animations of parallel program behavior despite the presence of asynchrony are presented. The techniques interpret program behavior in light of user-defined abstractions and generate animations based on a logical, rather than a physical, view of time. If this interpretation succeeds, the resulting animation is easily understood. If it fails, the programmer can be assured that the failure was not an artifact of the visualization. It is shown that these techniques can be generally applied to enhance visualizations of a variety of types of data as they are produced by parallel, MIMD (multiple instruction stream, multiple data stream) computations.&lt;&lt;ETX&gt;&gt;
Massively parallel isosurface extraction
Authors: Charles D. Hansen, Paul A. Hinker
Published at Vis, 1992

Experiences during the investigation of parallel methods for faster isosurface generation on SIMD (single instruction stream, multiple data stream) machines are described. A sequential version of a well-known isosurfacing algorithm is algorithmically enhanced for a particular type of SIMD architecture. The SIMD implementation takes full advantage of the data parallel nature of the algorithm, and experiments have proven the implementation to be highly scalable. A parallel tool, which can generate 170 K polygons/s, gives scientists the means to explore large 3D scalar or vector fields interactively.&lt;&lt;ETX&gt;&gt;
Network video device control
Authors: David R. Nadeau, Michael J. Bailey
Published at Vis, 1992

Work in progress at the San Diego Supercomputer Center (SDSC) involving the implementation of network clients and servers to provide networkwide access to video devices is described. Applications anywhere on the net can manage record and playback operations, change video signal routing, or adjust scan converter parameters. Details of network communications, protocols, and device-specific control quirks are invisible to the user, making the video equipment a true network resource.&lt;&lt;ETX&gt;&gt;
Object-oriented, dataflow visualization system-a paradigm shift?
Authors: William Ribarsky, Bob Brown, Terry Myerson, Richard Feldmann, Stuart Smith, Lloyd Treinish
Published at Vis, 1992

Discusses the breadth and the effectiveness of application visualization systems (AVSs). The current and future research areas involving AVSs, drawbacks and limitations of certain application areas, possible improvements to AVSs, and alternative analysis and visualization approaches are discussed.&lt;&lt;ETX&gt;&gt;
Optimizing triangulations by curvature equalization
Authors: Lori L. Scarlatos, Theodosios Pavlidis
Published at Vis, 1992

An algorithm that attempts to improve a triangulation by shifting the vertices so that curvature within the triangles is nearly equal is presented. Unnecessary triangles are removed. The method is an effective way of guaranteeing that the triangle vertices are points of higher curvature, and that the triangle edges correspond to distinctive edges on the surfaces. Triangulations of surfaces with constant curvature-and hence no distinctive features-will gain nothing from this or any other optimization algorithm. As demonstrated by the results, the techinque of moving triangle vertices can improve some triangulation models. Greatest improvements occur with surfaces characterized by sharp edges, such as the pyramid and ridge models. Less improvement occurs on models that already approximate the surface topology and/or have less distinctive features.&lt;&lt;ETX&gt;&gt;
Real virtual environment applications-now
Authors: Paul T. Breen, Georges G. Grinstein, David W. Mizell, Richard M. Satava, Bradford Smith, Michael M. Stephens, David Zeltzer
Published at Vis, 1992

Discusses efforts to develop virtual environment (VE) systems. The applications discussed are medical telesurgery, maintenance access, presence simulators, accounting visualizations, topographic visualizations and tools to assist developers in determining the value added of potential VE-based solutions.&lt;&lt;ETX&gt;&gt;
Rendering surface-particles
Authors: Jarke J. van Wijk
Published at Vis, 1992

Surface-particles are very small facets, modeled as points with a normal. They can be used to visualize flow in several ways by variation of the properties of the particle sources. A method is presented for the rendering of surface-particles. This method includes an improved shading model, the use of Gaussian filters for the prevention of spatial and temporal artifacts, an efficient scan-conversion algorithm, the handling of occlusion and the simultaneous rendering of geometric objects and surface-particles. The synthesis of images with limited depth of field is described, which literally allows the scientist to focus on areas of interest.&lt;&lt;ETX&gt;&gt;
Representing medical images with partitioning trees
Authors: Kalpathi R. Subramanian, Bruce F. Naylor
Published at Vis, 1992

The binary space partitioning tree is a method of converting a discrete space representation to a particular continuous space representation. The conversion is accomplished using standard discrete space operators developed for edge detection, followed by a Hough transform to generate candidate hyperplanes that are used to construct the partitioning tree. The result is a segmented and compressed image represented in continuous space suitable for elementary computer vision operations and improved image transmission/storage. Examples of 256*256 medical images for which the compression is estimated to range between 1 and 0.5 b/pixel are given.&lt;&lt;ETX&gt;&gt;
SuperGlue: a programming environment for scientific visualization
Authors: Jeff P. Hultquist, E. L. Raible
Published at Vis, 1992

It is suggested that many existing platforms over emphasize ease-of-use and do not adequately address issues of extensibility. A visualization testbed, called SuperGlue, which is particularly suited for the rapid development of new visualization methods, was built. An interpreter supports rapid development of new code, and an extensive class hierarchy encourages code reuse. By explicitly designing for ease of programming, it was possible to produce a visualization system which is powerful, easy to use, and rapidly improving. The motivation of the work, the architecture of the system, and plans for further development are reported.&lt;&lt;ETX&gt;&gt;
Surface curvature analysis using color
Authors: L. R. Seidenberg, Robert B. Jerard, J. Megewick
Published at Vis, 1992

In the automotive industry, it is highly important that the exterior body panels be esthetically pleasing. One aspect of creating esthetically pleasing surfaces is to require that they be fair. A system that has proven useful for diagnosis of surface fairness problems is presented. How to choose a set of colors with perceptually uniform spacing is described, and the usefulness of a logarithmic scale for relating curvature to colors is shown.&lt;&lt;ETX&gt;&gt;
Techniques for managing very large scientific databases
Authors: William J. Campbell, George Fekete, Robert F. Cromp, Ray Wall, Michael Goldberg
Published at Vis, 1992

Discusses issues relating to the state of the art in scientific data management. Management of scientific data sets or databases is reviewed. The generic science requirements, as well as a case example that drives the underlying data management system architecture are explored, showing current technology limitations. A concept of intelligent information fusion with sufficient detail on how to integrate advanced technologies to enhance scientific production, is presented. Emphasis is on user interfaces, spatial data structure, uses of neural networks for extracting information from scientific imagery, uses of object-oriented database management systems, animation, and visualization techniques.&lt;&lt;ETX&gt;&gt;
The microscopist's workstation
Authors: Philip J. Mercurio, T. Todd Elvins, Stephen J. Young
Published at Vis, 1992

Issues involved in operating a sophisticated scientific instrument as a computer peripheral accessible over a high-speed network are studied. A custom interactive visualization application was constructed to support investigation using a unique computer-controlled high-voltage electron microscope. The researcher's workstation forms the visible third of a triumvirate, along with the instrument and the compute resource. The software was designed to support not only image acquisition, but also many of the tasks that microscope researchers perform in analyzing images. The result of this case study is the identification of some of the issues regarding interacting with scientific instrumentation over high-speed networks and the construction of custom applications to support many of the tasks within a laboratory's research methodology.&lt;&lt;ETX&gt;&gt;
The state of the art of visual languages for visualization
Authors: Carla S. Williams, John Rasure, C. Hansen
Published at Vis, 1992

Data flow visual language systems are being used to provide sophisticated environments for the visualization of scientific data. These systems are evolving rapidly and are beginning to encompass related technologies such as distributed computing and user interface development systems. A hierarchical classification of the components and issues involved is presented, giving an understanding of the design decisions and trade-offs that the developers of these systems are making. The component categories can be used as a framework for discussing where interoperability of competing visual programming environments might occur and what the future holds for these systems.&lt;&lt;ETX&gt;&gt;
Towards a comprehensive volume visualization system
Authors: Ricardo S. Avila, Lisa M. Sobierajski, Arie E. Kaufman
Published at Vis, 1992

The VolVis system has been developed to satisfy the diverse requirements of the volume visualization community by comfortably housing numerous visualization algorithms and methods within a consistent and well organized framework. The VolVis system is supported by a generalized abstract model which provides for both geometric and volumetric constructs. VolVis contains several rendering algorithms that span the speed versus accuracy continuum. A fast volume rendering algorithm has been developed, which is capable of exploiting existing graphics hardware without placing any viewing restrictions or compromising accuracy. In addition, VolVis includes a volumetric navigation facility, key-frame animation generator, quantitative analysis tools, and a generalized protocol for communicating with 3D input devices.&lt;&lt;ETX&gt;&gt;
Virtual Smoke: an interactive 3D flow visualization technique
Authors: Kwan-Liu Ma, Philip J. Smith
Published at Vis, 1992

A technique is given for computer visualization of simultaneous three-dimensional vector and scalar fields such as velocity and temperature in reacting fluid flow fields. The technique, which is called Virtual Smoke, simulates the use of colored smoke for experimental gaseous fluid flow visualization. However, it is noninvasive and can animate, in particular, the dynamic behaviors of steady-state or instantaneous flow fields obtained from numerical simulations. Virtual Smoke is based on volume seeds and volume seedlings, which are direct volume visualization methods previously developed for highly interactive scalar volume data exploration. Data from combustion simulations are used to demonstrate the effectiveness of Virtual Smoke.&lt;&lt;ETX&gt;&gt;