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VIS 05: IEEE Visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： Visualization

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A Study of Transfer Function Generation for Time-Varying Volume Data 2

A Study of Transfer Function Generation for Time-Varying Vol...

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2nd IEEE TCVG / Eurographics International Workshop on Volume graphics, VG 2001

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Visualization And Graphics Research Group Center For Image Processing And Integrated Computing University Of California Department Of Computer Science DavisCA95616 United States

ISBN: (纸本)321183737X

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data may be captured by a single or small set of transfer functions. The criteria which dictate when more than one transfer function is needed were also investigated. Four data sets with different temporal characteristics were used for our study. Results obtained using two different classes of methods are discussed, along with lessons learned. These methods, including a new multiresolution opacity map approach, can be used for semi-automatic generation of transfer functions to explore large-scale time-varying data sets. © VG 2001. All rights reserved.

关键词： Transfer functions

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Bundle adjustment revisited

arXiv

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arXiv 2019年

作者： Chen, Yu Chen, Yisong Wang, Guoping Peking University Department of Computer Science and Technology Graphics and Interactive Lab Beijing China

3D reconstruction has been developing all these two decades, from moderate to medium size and to large scale. It’s well known that bundle adjustment plays an important role in 3D reconstruction, mainly in Structure from Motion(SfM) and Simultaneously Localization and Mapping(SLAM). While bundle adjustment optimizes camera parameters and 3D points as a non-negligible final step, it suffers from memory and efficiency requirements in very large scale reconstruction. In this paper, we study the development of bundle adjustment elaborately in both conventional and distributed approaches. The detailed derivation and pseudo codes are also given in this paper. Copyright © 2019, The Authors. All rights reserved.

关键词： Image reconstruction

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Understanding "cool" in human-computer interaction research and design 13

Understanding "cool" in human-computer interaction research ...

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25th Australian computer-Human Interaction Conference: Augmentation, Application, Innovation, Collaboration, OzCHI 2013

作者： Raptis, Dimitrios Kjeldskov, Jesper Skov, Mikael Research Center for Socio+Interactive Design Department of Computer Science Aalborg University Selma Lagerlöfs Vej 300 9220 Aalborg Denmark

ISBN: (纸本)9781450325257

Recently a discussion has been initiated on what is cool and how HCI can use the concept in practice and design for it. This paper aims to provide a better understanding on cool as a concept from a theoretical and a practical perspective. From the theoretical perspective, we selected the HCI papers that focus on cool and we present their core findings. Then we performed a literature review on the concept of cool and we have identified its fundamental characteristics, through cool personalities and cool styles. From a practical perspective, we have studied how other domains have managed to successfully produce cool objects and we provide four suggestions on how to design cool digital artifacts. Finally, in this paper we also identify possible research directions in relation to cool, which if we manage to address we can increase our understanding on what is user experience and this can lead to the creation of better digital artifacts. Overall, this paper is a contribution towards researching and designing for cool, a research topic, which we believe it will initiate fruitful discussions in the HCI field.

关键词： Human computer interaction

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Visual Analysis of Point Cloud Neighborhoods via Multi-Scale Geometric Measures

Visual Analysis of Point Cloud Neighborhoods via Multi-Scale...

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42nd Annual Conference on European Association for computer graphics, EUROgraphics 2021

作者： Ritter, M. Schiffner, D. Harders, M. Interactive Graphics and Simulation Group The Department of Computer Science University of Innsbruck Austria DIPF Leibniz Institute for Research and Information Education Frankfurt Germany Airborne Hydromapping GmbH Innsbruck Austria

ISBN: (纸本)9783038681335

Point sets are a widely used spatial data structure in computational and observational domains, e.g. in physics particle simulations, computer graphics or remote sensing. Algorithms typically operate in local neighborhoods of point sets, for computing physical states, surface reconstructions, etc. We present a visualization technique based on multi-scale geometric features of such point clouds. We explore properties of different choices on the underlying weighted co-variance neighborhood descriptor, illustrated on different point set geometries and for varying noise levels. The impact of different weighting functions and tensor centroids, as well as point set features and noise levels becomes visible in the rotation-invariant feature images. We compare to a curvature based scale space visualization method and, finally, show how features in real-world LiDAR data can be inspected by images created with our approach in an interactive tool. In contrast to the curvature based approach, with our method line structures are highlighted over growing scales, with clear border regions to planar or spherical geometric structures. © 2021 The Author(s).

关键词： Data visualization

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Dynamic maps for long-Term operation of mobile service robots

Dynamic maps for long-Term operation of mobile service robot...

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International Conference on Robotics: science and Systems, RSS 2005

作者： Biber, Peter Duckett, Tom Graphical-Interactive Systems Wilhelm Schickard Institute for Computer Science University of Tübingen Germany AASS Research Center Department of Technology Örebro University Sweden

ISBN: (纸本)9780262701143

This paper introduces a dynamic map for mobile robots that adapts continuously over time. It resolves the stabilityplasticity dilemma (the trade-off between adaptation to new patterns and preservation of old patterns) by representing the environment over multiple timescales simultaneously (5 in our experiments). A sample-based representation is proposed, where older memories fade at different rates depending on the timescale. Robust statistics are used to interpret the samples. It is shown that this approach can track both stationary and non-stationary elements of the environment, covering the full spectrum of variations from moving objects to structural changes. The method was evaluated in a five week experiment in a real dynamic environment. Experimental results show that the resulting map is stable, improves its quality over time and adapts to changes. © 2005 Massachusetts Institute of Technology.

关键词： Mobile robots

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Human media technology-the human-centered, sustainable technology development

Human media technology-the human-centered, sustainable techn...

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computer graphics International

作者： J.L. Encarnacao F. Loseries C. Sifaqui Fraunhofer-IGD Darmstadt Germany Computer Graphics Center ZGDV Darmstadt Germany Interactive Graphics Systems Group. Department of Computer Science Darmstadt University of Technology Darmstadt Germany

The development of the Internet, the Web, and Java let us believe that computing technology seems to become an integral part of our daily environment that hopefully supports us in improving the quality of life. But what does this mean to the future of information technology development? This paper presents visions towards sustainable, human-centered technology developments. New trends in human computer interaction and human information interaction are necessary for enabling even the naive user to communicate and interact with computers. What we need is a paradigm shift from the conventional information technology towards a human media technology which focus on the interaction manner between human beings and information space or amongst human beings through information space.

关键词： computer graphics Internet Human computer interaction computer science Electronic mail Java Read only memory Space technology Environmental management Home computing

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Floor interaction hci reaching new ground

Floor interaction hci reaching new ground

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Conference on Human Factors in Computing Systems, CHI EA 2005

作者： Petersen, Marianne Graves Krogh, Peter Gall Ludvigsen, Martin Lykke-Olesen, Andreas Center for Interactive Spaces Department of Computer Science University of Aarhus Abogade 34 DK-8200 Arhus N Denmark Center for Interactive Spaces Aarhus School of Architecture Nørreport 20 DK-8000 Arhus C Denmark

ISBN: (纸本)1595930027

Within architecture, there is a long tradition of careful design of floors. The design has been concerned with both decorating floors and designing floors to carry information. Ubiquitous computing technology offers new opportunities for designing interactive floors. This paper presents threedifferent interactive floor concepts. Through an urban perspective it draws upon the experiences of floors in architecture, and provides a set of design issues for designing interactive floors.

关键词： Floors

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Visual equivalence: An object-based approach to image quality

Visual equivalence: An object-based approach to image qualit...

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16th Color Imaging Conference: Color science and Engineering Systems, Technologies, and Applications

作者： Ferwerda, James A. Ramanarayanan, Ganesh Walter, Bruce Bala, Kavita Munsell Color Science Laboratory Center for Imaging Science Rochester Institute of Technology Rochester NY United States Department of Computer Science Cornell University Ithaca NY United States Program of Computer Graphics Cornell University Ithaca NY United States

ISBN: (纸本)9780892082810

In this paper we introduce a new approach to characterizing image quality: visual equivalence, Images are visually equivalent if they convey the same information about object appearance even if they are visibly different. In a series of psychophysical experiments we explore how object geometry, material, and illumination interact to produce images that are visually equivalent, and we identify how two kinds of transformations on illumination fields (blurring and warping) influence observers' judgments of equivalence. We use the results of the experiments to derive metrics that can serve as visual equivalence predictors (VEPs) and we generalize these metrics so they can be applied to novel objects and scenes. Finally we validate the predictors in a confirmatory study, and show that they reliably predict observer's judgments of equivalence. Visual equivalence is a significant new approach to measuring image quality that goes beyond existing visible difference metrics by leveraging the fact that some kinds of image differences do not matter to human observers. By taking advantage of higher order aspects of visual object coding, visual equivalence metrics should enable the development of powerful new classes of image capture, compression, rendering, and display algorithms.

关键词： Image quality

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Preparation of unstructured data arrays for face recognition in cross-platform registration systems

Preparation of unstructured data arrays for face recognition...

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International Association of Management science and Engineering Technology

作者： Kazantsev, Nikolai S. Degtyrev, Vladimir M. Department of Computer Graphics Saint-Petersburg Russia National Research University Higher School of Economics BPM Department Science and Education Center of Information Control Technologies Moscow Russia

On the informatics and the software sides the questions of practical security are linked to the unstructured information processing algorithms applicable for the video array frames obtained by cross platform registration systems. Compression solutions become crucially important when the temporal evolution of the video stream exceeds the traffic capacity of the communication network. The basic image processing approach we exploited is to maintain of the highest resolution degree for the main part of the object we survey (for example, a man's face or figure) whilst minimizing the information traffic from the image background by its artificial substitution with a homogeneous color filling. This method allowed us to obtain a significant compression rate (up to 7000). © 2012 WIT Press.

关键词： Image compression

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