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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： René Rosenbaum Jian Zhi Bernd Hamann Visual Computing and Computer Graphics group (VCG) Institute for Computer Science University of Rostock Rostock Germany Institute for Data Analysis and Visualization (IDAV) Department of Computer Science University of California Davis CA USA Department of Industrial Engineering and Operations Research Columbia University NY USA

Progressive refinement is a methodology that makes it possible to elegantly integrate scalable data compression, access, and presentation into one approach. Specifically, this paper concerns the effective use of progressive parallel coordinates (PPCs), utilized routinely for high-dimensional data visualization. It discusses how the power of the typical stages of progressive data visualization can also be utilized fully for PPCs. Further, different implementations of the underlying methods and potential application domains are described. The paper also presents empirical results concerning the benefits of PPC with regard to efficient data management and improved presentation, indicating that the proposed approach is able to close the gap between data handling and visualization.

关键词： Lead visualization Logic gates

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New Technique:Sketch-based rotation editing

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Journal of Zhejiang University-science C(computers and Electronics) 2011年第11期12卷 867-872页

作者： Yue XIE Wei-wei XU Yi-zhou YU Yan-lin WENG School of Computer Science and Technology Zhejiang University Hangzhou 310027 China Internet Graphics Group Microsoft Research Asia Beijing 100190 China Department of Computer Science University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA

We present a sketch-based rotation editing mations. Given a set of keyframe orientations of a rigid system for enriching rotational motion in keyframe ani- object, the user first edits its angular velocity trajectory by sketching curves, and then the system computes the altered rotational motion by solving a variational curve fitting problem. The solved rotational motion not only satisfies the orientation constraints at the keyframes, but also fits well the user-specified angular velocity trajectory. Our system is simple and easy to use. We demonstrate its usefulness by adding interesting and realistic rotational details to several keyframe animations.

关键词： Quaternions Keyframe interpolation Animation editing

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Self-motion illusions in immersive virtual reality environments

Self-motion illusions in immersive virtual reality environme...

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IEEE Annual International Symposium Virtual Reality

作者： Gerd Bruder Frank Steinicke Phil Wieland Visualization and Computer Graphics Research Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

Motion perception in immersive virtual reality environments significantly differs from the real world. For example, previous work has shown that users tend to underestimate travel distances in immersive virtual environments (VEs). As a solution to this problem, some researchers propose to scale the mapped virtual camera motion relative to the tracked real-world movement of a user until real and virtual motion appear to match, i. e., real-world movements could be mapped with a larger gain to the VE in order to compensate for the underestimation. Although this approach usually results in more accurate self-motion judgments by users, introducing discrepancies between real and virtual motion can become a problem, in particular, due to misalignments of both worlds and distorted space cognition. In this paper we describe a different approach that introduces apparent self-motion illusions by manipulating optic flow fields during movements in VEs. These manipulations can affect self-motion perception in VEs, but omit a quantitative discrepancy between real and virtual motions. We introduce four illusions and show in experiments that optic flow manipulation can significantly affect users' self-motion judgments. Furthermore, we show that with such manipulation of optic flow fields the underestimation of travel distances can be compensated.

关键词： visualization Optical sensors Cameras Integrated optics Blindness Optical distortion Detectors

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The effects of interaction techniques on talk patterns in collaborative peer learning around interactive tables 11

The effects of interaction techniques on talk patterns in co...

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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

作者： Jamil, Izdihar O'Hara, Kenton Perry, Mark Karnik, Abhijit Subramanian, Sriram Interaction and Graphics Group Department of Computer Science University of Bristol United Kingdom Microsoft Research Cambridge United Kingdom DISC Brunel University United Kingdom Mobile Life Interactive Institute Sweden

ISBN: (纸本)9781450302289

This paper presents the findings of a user study investigating conversational patterns across three conditions of table-based interaction (direct touch interactive table, pantograph interactive table and non-digital table) for different types of educational activities. Findings demonstrate that communication style is significantly affected by interaction techniques. The direct touch technique stimulated conversations based around the topic and pedagogical method. The pantograph technique promoted playfulness and had a higher number of directive utterances between participants, with fewer task-based, group-oriented utterances. The non-digital table promoted reflective forms of task-orientated utterance, encouraged group communication and fostered more equitable participation between members. The findings provide insights into the design of interactive tables to support particular forms of social interaction. Copyright 2011 ACM.

关键词： Pantographs

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Sketch-based rotation editing

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Frontiers of Information Technology & Electronic Engineering 2011年第11期12卷

We present a sketch-based rotation editing system for enriching rotational motion in keyframe *** a set of keyframe orientations of a rigid object,the user first edits its angular velocity trajectory by sketching curves,and then the system computes the altered rotational motion by solving a variational curve fitting *** solved rotational motion not only satisfies the orientation constraints at the keyframes,but also fits well the user-specified angular velocity *** system is simple and easy to *** demonstrate its usefulness by adding interesting and realistic rotational details to several keyframe animations.

关键词： Quaternions Keyframe interpolation Animation editing

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Augmentation techniques for efficient exploration in head-mounted display environments 10

Augmentation techniques for efficient exploration in head-mo...

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Proceedings of the 17th ACM Symposium on Virtual Reality Software and Technology

作者： Bolte, Benjamin Bruder, Gerd Steinicke, Frank Hinrichs, Klaus Lappe, Markus Visualization and Computer Graphics Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

ISBN: (纸本)9781450304412

Physical characteristics and constraints of today's head-mounted displays (HMDs) often impair interaction in immersive virtual environments (VEs). For instance, due to the limited field of view (FOV) subtended by the display units in front of the user's eyes more effort is required to explore a VE by head rotations than for exploration in the real world. In this paper we propose a combination of two augmentation techniques that have the potential to make exploration of VEs more efficient: (1) augmenting the geometric FOV (GFOV) used for rendering the VE, and (2) amplifying head rotations while the user changes her head orientation. In order to identify how much manipulation can be applied without users noticing, we conducted two psychophysical experiments in which we analyzed subjects' ability to discriminate between virtual and real head pitch and roll rotations while three different geometric FOVs were used. Our results show that the combination of both techniques has great potential to support efficient exploration of VEs. We found that virtual pitch and roll rotations can be amplified by 30% and 44% respectively, when the GFOV matches the subject's estimation of the most natural FOV. This leads to a possible reduction of the user's effort required to explore the VE using a combination of both techniques by approximately 25%. Copyright © 2010 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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5D-odetlap: A novel five-dimensional compression method on time-varying multivariable geospatial dataset

5D-odetlap: A novel five-dimensional compression method on t...

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Special Joint Symposium of ISPRS Commission IV and AutoCarto 2010, in Conjunction with ASPRS/CaGIS 2010 Special Conference

作者： Li, You Lau, Tsz-Yam Fox, Peter Randolph Franklin, W. Computer Science Department Computer Graphics Research Group Rensselaer Polytechnic Institute 110 Eighth Street TroyNY United States

A five dimensional (5D) geospatial dataset consists of several multivariable 4D datasets, which are sequences of time-varying volumetric 3D geographical datasets. These datasets are typically very large in size and demand a great amount of resources for storage and transmission. In this paper, we present a lossy compression technique for 5D geospatial data as a whole, instead of applying 3D compression method on each 3D slice of the 5D dataset. Our lossy compression technique efficiently exploits spatial and temporal similarities between 2D data slices and 3D volumes in 4D oceanographic datasets. 5D-ODETLAP, which is an extension of, but essentially different from, the Laplacian partial differential equation, solves a sparse overdetermined system of equations to compute data at each point in (x,y,z,t,v) space from the data given at a representative set of points. 5D-ODETLAP is not restricted to certain types of datasets. For different datasets, it has the flexibility to approximate each one according to their respective data distributions by using suitable parameters. The final approximation is further compressed using Run Length Encoding. We use different datasets and metrics to test 5D-ODETLAP, and performance evaluations have shown that the proposed compression technique outperforms current 3D-SPIHT method on our selected datasets, from the World Ocean Atlas 2005. Having about the same mean percentage error, 5D-ODETLAP's compression result produces much smaller maximum error than 3D-SPIHT. A user-defined mean or maximum error can be set to obtain desired compression in the proposed method, while not in 3D-SPIHT.

关键词： Digital storage

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Animating horse gaits and transitions

Animating horse gaits and transitions

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8th Theory and Practice of computer graphics Conference, TPCG 2010

作者： Murphy, J.E. Carr, H. O'Neill, M. Imaging Visualisation and Graphics Group School of Computer Science and Informatics University College Dublin Ireland Visualization and Virtual Reality Group School of Computing University of Leeds United Kingdom Natural Computing Research and Applications Group School of Computer Science and Informatics University College Dublin Ireland

ISBN: (纸本)9783905673753

Animations of horses are commonly used for entertainment purposes. A realistic animated model must move with a gait appropriate to its velocity. We present a kinematic animation system in which a horse model moves using gaits and transitions based on predictions from Dynamic Similarity theory. A Genetic Programming technique is used to evolve gait motion with dynamically adjustable limb extent. The system is controlled in real-time using a MIDI controller system based around the model's Froude number. We were successful in producing high quality animations of the horse's natural gaits and transitions. © The Eurographics Association 2010.

关键词： Genetic algorithms

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A multi-touch enabled human-transporter metaphor for virtual 3D traveling

A multi-touch enabled human-transporter metaphor for virtual...

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Dimitar Valkov Frank Steinicke Gerd Bruder Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

ISBN: (纸本)9781424468461;9781424468447

In this tech-note we demonstrate how multi-touch hand gestures in combination with foot gestures can be used to perform navigation tasks in interactive 3D environments. Geographic Information Systems (GIS) are well suited as a complex testbed for evaluation of user interfaces based on multi-modal input. Recent developments in the area of interactive surfaces enable the construction of low-cost multi-touch displays and relatively inexpensive sensor technology to detect foot gestures, which allows to explore these input modalities for virtual reality environments. In this tech-note, we describe an intuitive 3D user interface metaphor and corresponding hardware, which combine multi-touch hand and foot gestures for interaction with spatial data.

关键词： Navigation Foot Legged locomotion User interfaces Geographic Information Systems Virtual reality visualization computer graphics computer science System testing

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Immersive virtual studio for architectural exploration

Immersive virtual studio for architectural exploration

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Gerd Bruder Frank Steinicke Dimitar Valkov Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

ISBN: (纸本)9781424468461;9781424468447

Architects use a variety of analog and digital tools and media to plan and design constructions. Immersive virtual reality (VR) technologies have shown great potential for architectural design, especially for exploration and review of design proposals. In this work we propose a virtual studio system, which allows architects and clients to use arbitrary real-world tools such as maps or rulers during immersive exploration of virtual 3D models. The user interface allows architects and clients to review designs and compose 3D architectural scenes, combining benefits of mixed-reality environments with immersive head-mounted display setups.

关键词： Virtual reality User interfaces Layout Cameras computer graphics Legged locomotion Laboratories computer displays Three dimensional displays Process design

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