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International Research and Training Group 1131 Workshop on visualization of Large and Unstructured data Sets - Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2010

作者： Yang, Xiang Deines, Eduard Aurich, Jan C. University of Kaiserslautern P.O. Box 3049 Kaiserslautern 67657 Germany Institute for Data Analysis and Visualization University of California One Shields Ave Davis CA 95616 United States

ISBN: (纸本)9783939897293

In a manufacturing system (MS), a wide range of human activities are applied in production processes. The human factor plays a core role and should be incorporated into the design, planning and decision making processes. In this work we describe different definitions, developments and existing concepts of a Virtual Factory (VF) and discuss VFs from the human oriented point of view. Furthermore, we analyze the potential need and use of visualization methods in VF study and propose a human-centered VF concept. Following this concept we introduce an example implementation and describe how our model facilitates the decision making and design process in MS. In addition, we show an example of a noise analysis of working environment, which is based on our virtual factory model.

关键词： visualization

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Leaf glyphs: Story telling and data analysis using environmental data glyph metaphors

Communications in Computer and Information Science

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Communications in Computer and Information Science 2016年 598卷 123-143页

作者： Fuchs, Johannes Jäckle, Dominik Weiler, Niklas Schreck, Tobias Data Analysis and Visualization Group University of Konstanz Universitätstr. 10 Konstanz78457 Germany

In exploratory data analysis, important analysis tasks include the assessment of similarity of data points, labeling of outliers, identifying and relating groups in data, and more generally, the detection of patterns. Specifically, for large data sets, such tasks may be effectively addressed by glyph-based visualizations. Appropriately defined glyph designs and layouts may represent collections of data to address these aforementioned tasks. Important problems in glyph visualization include the design of compact glyph representations, and a similarityor structure-preserving 2D layout. Projection-based techniques are commonly used to generate layouts, but often suffer from over-plotting in 2D display space, which may hinder comparing and relating tasks. Inspired by contour and venation shapes of natural leafs, and their aggregation by stems, we introduce a novel glyph design for visualizing multi-dimensional data. Motivated by the human ability to visually discriminate natural shapes like trees in a forest, single flowers in a flowerbed, or leaves at shrubs, we design a flexible leaf-shaped data glyph, where data controls main leaf properties including leaf morphology, leaf venation, and leaf boundary shape. Our basic leaf glyph can map to more than a dozen of numeric and categorical variables. We also define custom visual aggregation schemes to scale the glyph for large numbers of data records, including prototype-based, set-based, and hierarchic aggregation. We show by example that our design is effectively interpretable to solve multivariate data analysis tasks, and provides effective data mapping. The design provides an aesthetically pleasing appearance, and lends itself easily to storytelling in environmental data analysis problems, among others. The glyph and its aggregation schemes are proposed as a scalable multivariate data visualization design, with applications in data visualization for mass media and data journalism, among others. © Springer International

关键词： visualization

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A Foveal Inset for Large Display Environments

A Foveal Inset for Large Display Environments

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IEEE Annual International Symposium Virtual Reality

作者： B.A. Ahlborn O. Kreylos B. Hamann O. Staadt Department of Computer Science Institute for Data Analysis and Visualization University of California USA

We introduce a system that adds a foveal inset to large-scale projection displays. The effective resolution of the foveal inset projection is higher than the original display resolution, allowing the user to see more details and finer features in large data sets. The foveal inset is generated by projecting a high-resolution image onto a mirror mounted on a pan-tilt unit (PTU) that is controlled by the user with a laser pointer. Our implementation is based on Chromium and supports many OpenGL applications without modifications.

关键词： Computer displays Tiles Mirrors Calibration Cameras Chromium Hardware Graphical user interfaces Costs Linux

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Marching diamonds for unstructured meshes

Marching diamonds for unstructured meshes

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IEEE Conference on visualization

作者： J.C. Anderson J.C. Bennett K.I. Joy Institute for Data Analysis and Visualization Computer Science Department University of California Davis USA

We present a higher-order approach to the extraction of isosurfaces from unstructured meshes. Existing methods use linear interpolation along each mesh edge to find isosurface intersections. In contrast, our method determines intersections by performing barycentric interpolation over diamonds formed by the tetrahedra incident to each edge. Our method produces smoother, more accurate isosurfaces. Additionally, interpolating over diamonds, rather than linearly interpolating edge endpoints. enables us to identify up to two isosurface intersections per edge. This paper details how our new technique extracts isopoints, and presents a simple connection strategy for forming a triangle mesh isosurface.

关键词： Isosurfaces Interpolation data analysis data visualization Computer science Aircraft data mining Chromium Computer graphics Surface cracks

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A practical system for laser pointer interaction on large displays

A practical system for laser pointer interaction on large di...

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VRST'05 - ACM Symposium on Virtual Reality Software and Technology 2005

作者： Ahlborn, Benjamin A. Thompson, David Kreylos, Oliver Hamann, Bernd Staadt, Oliver G. Institute for Data Analysis and Visualization Dept. of Comp. Sci. University of California Davis Davis CA 95616 United States Sandia National Labs Livermore CA 94550 United States

ISBN: (纸本)1595930981

Much work has been done on the development of laser pointers as interaction devices. Typically a camera captures images of a display surface and extracts a laser pointer dot location. This location is processed and used as a cursor position. While the current literature well explains such a system, we feel that some important practical concerns have gone unaddressed. We discuss the design of such a tracking system, focusing on key practical implementation details. In particular we present a robust and efficient dot detection algorithm that allows us to use our system under a variety lighting conditions, and allows us to reduce the amount of image parsing required to find a laser position by an order of magnitude. Copyright 2005 ACM.

关键词： Interactive computer graphics

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Feature-based visualization of dense integral line data

Feature-based visualization of dense integral line data

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International Research and Training Group 1131 Workshop on visualization of Large and Unstructured data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Schröder, Simon Obermaier, Harald Garth, Christoph Joy, Kenneth I. Computer Graphics and HCI Group University of Kaiserslautern Germany Fraunhofer ITWM Kaiserslautern Germany Computational Topology Group University of Kaiserslautern Germany Institute for Data Analysis and Visualization University of California Davis United States

ISBN: (纸本)9783939897460

Feature-based visualization of flow fields has proven as an effective tool for flow analysis. While most flow visualization techniques operate on vector field data, our visualization techniques make use of a different simulation output: Particle Tracers. Our approach solely relies on integral lines that can be easily obtained from most simulation software. The task is the visualization of dense integral line data. We combine existing methods for streamline visualization, i. e. illumination, transparency, and halos, and add ambient occlusion for lines. But, this only solves one part of the problem: because of the high density of lines, visualization has to fight with occlusion, high frequency noise, and overlaps. As a solution we propose non-automated choices of transfer functions on curve properties that help highlighting important flow features like vortices or turbulent areas. These curve properties resemble some of the original flow properties. With the new combination of existing line drawing methods and the addition of ambient occlusion we improve the visualization of lines by adding better shape and depth cues. The intelligent use of transfer functions on curve properties reduces visual clutter and helps focusing on important features while still retaining context, as demonstrated in the examples given in this work.

关键词： Transfer functions

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Event identification for local areas using social media streaming data

Event identification for local areas using social media stre...

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3rd ACM SIGMOD Workshop on databases and Social Networks, DBSocial 2013

作者： Weiler, Andreas Scholl, Marc H. Wanner, Franz Rohrdantz, Christian Database and Information Systems Group University of Konstanz Box D188 78457 Konstanz Germany Data Analysis and Visualization Group University of Konstanz Box D78 78457 Konstanz Germany

ISBN: (纸本)9781450321914

Unprecedented success and active usage of social media services result in massive amounts of user-generated data. An increasing interest in the contained information from social media data leads to more and more sophisticated analysis and visualization applications. Because of the fast pace and distribution of news in social media data it is an appropriate source to identify events in the data and directly display their occurrence to analysts or other users. This paper presents a method for event identification in local areas using the Twitter data stream. We implement and use a combined log-likelihood ratio approach for the geographic and time dimension of real-life Twitter data in predefined areas of the world to detect events occurring in the message contents. We present a case study with two interesting scenarios to show the usefulness of our approach. Copyright 2013 ACM.

关键词： Media streaming

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Using Monte Carlo ray tracing simulations to model the quantum harmonic oscillator modes observed in uranium nitride

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Physical Review B 2014年第14期89卷 144302-144302页

作者： J. Y. Y. Lin A. A. Aczel D. L. Abernathy S. E. Nagler W. J. L. Buyers G. E. Granroth Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

Recently an extended series of equally spaced vibrational modes was observed in uranium nitride (UN) by performing neutron spectroscopy measurements using the ARCS and SEQUOIA time-of-flight chopper spectrometers [A. A. Aczel et al., Nat. Commun. 3, 1124 (2012)]. These modes are well described by three-dimensional isotropic quantum harmonic oscillator (QHO) behavior of the nitrogen atoms, but there are additional contributions to the scattering that complicate the measured response. In an effort to better characterize the observed neutron scattering spectrum of UN, we have performed Monte Carlo ray tracing simulations of the ARCS and SEQUOIA experiments with various sample kernels, accounting for nitrogen QHO scattering, contributions that arise from the acoustic portion of the partial phonon density of states, and multiple scattering. These simulations demonstrate that the U and N motions can be treated independently, and show that multiple scattering contributes an approximate Q-independent background to the spectrum at the oscillator mode positions. Temperature-dependent studies of the lowest few oscillator modes have also been made with SEQUOIA, and our simulations indicate that the T dependence of the scattering from these modes is strongly influenced by the uranium lattice.

关键词： URANIUM MONTE Carlo method NITRIDES RAY tracing algorithms HARMONIC oscillators

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Viewed Lightness Prediction Model of Textile Compound Multifilament 11th

Viewed Lightness Prediction Model of Textile Compound Multif...

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11th China Academic Conference on Printing and Packaging, CACPP 2020

作者： Wang, Yujuan Wang, Jun Yuan, Jiangping Tian, Jieni Chen, Guangxue State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou China College of Textiles Donghua University Shanghai China Institute for Visualization and Data Analysis Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (纸本)9789811605024

To facilitate the design of the textile compound multifilament before spinning, a viewed lightness prediction model was proposed. To examine the prediction effect, 7 different color monofilaments were used to simulate 21 multifilaments according to a simplified multifilament model. Then, the mixed lightness of these multifilaments were calculated by adding the weighted tristimulus values of the surface color of a multifilament, and scaled by 12 observers in the subjective experiment. The average difference between the calculated and scaled lightness was 0.39. In order to determine the significant factors affecting the lightness difference, the Pearson’s correlation analysis was conducted. The results show that the lightness difference decreased with the increase of the calculated CIE lightness (L*) or yellow-blue value (b*) of the multifilament. Finally, the optimized viewed lightness prediction model was derived by the SPSS analysis. The average lightness difference was reduced to -0.01, indicating this model can provide reliable prediction for personalized compound multifilament. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Forecasting

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Path-based constraints for accurate scene reconstruction from aerial video

Path-based constraints for accurate scene reconstruction fro...

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Applied Imagery Pattern Recognition Workshop (AIPR)

作者： Mauricio Hess-Flores Mark A. Duchaineau Kenneth I. Joy Institute for Data Analysis and Visualization University of California Davis USA Google Inc. USA

This paper discusses the constraints imposed by the path of a moving camera in multi-view sequential scene reconstruction scenarios such as in aerial video, which allow for an efficient detection and correction of inaccuracies in the feature tracking and structure computation processes. The main insight is that for short, planar segments of a continuous camera trajectory, parallax movement corresponding to a viewed scene point should ideally form a scaled and translated version of this trajectory when projected onto a parallel plane. Two inter-camera and intra-camera constraints arise, which create a prediction of where all feature tracks should be located given the consensus information of all accurate tracks and cameras, which allows for the detection and correction of inaccurate feature tracks, as well as a very simple update of scene structure. This procedure differs from classical approaches such as factorization and RANSAC. In both aerial video and turntable sequences, the use of such constraints was proven to correct outlier tracks, detect and correct tracking drift, allow for a simple updating of scene structure, and improve bundle adjustment convergence.

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