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On-Tube Attribute Visualization for Multivariate Trajectory Data

IEEE Transactions on Visualization and computer graphics 2023年第1期29卷 1288-1298页

作者： Russig, Benjamin Grab, David Dachselt, Raimund Gumhold, Stefan Department of Computer Graphics and Visualization TU Dresden Germany TU Dresden Interactive Media Lab Germany

Stylized tubes are an established visualization primitive for line data as encountered in many scientific fields, ranging from characteristic lines in flow fields, fiber tracks reconstructed from diffusion tensor imaging, to trajectories of moving objects as they arise from cyber-physical systems in many engineering disciplines. Typical challenges include large data set sizes demanding for efficient rendering techniques as well as a large number of attributes that cannot be mapped simultaneously to the basic visual attributes provided by a tube-based visualization. In this work, we tackle both challenges with a new on-tube visualization approach. We improve recent work on high-quality GPU ray casting of Hermite spline tubes supporting ambient occlusion and extend it by a new layered procedural texturing technique. In the proposed framework, a large number of data set attributes can be mapped simultaneously to a variety of glyphs and plots that are embedded in texture space and organized in layers. Efficient rendering with minimal data transfer is achieved by generating the glyphs procedurally and drawing them in a deferred shading pass. We integrated these techniques in a prototype visualization tool that facilitates flexible mapping of data set attributes to visual tube and glyph attributes. We studied our approach on a variety of example data from different fields and found it to provide a highly adaptable and extensible toolbox to quickly craft tailor-made tube-based trajectory visualizations. © 2022 IEEE.

关键词： Trajectories

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Formation sketching: An approach to stylize groups in crowd simulation

Formation sketching: An approach to stylize groups in crowd ...

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37th graphics Interface Conference, GI 2011

作者： Gu, Qin Deng, Zhigang Computer Graphics and Interactive Media Lab. Department of Computer Science University of Houston United States

ISBN: (纸本)9781450306935

Most of existing crowd simulation algorithms focus on the moving trajectories of individual agents, while collective group formations are often roughly learned from video examples or manually specified via various hard constraints (e.g., pre-defined keyframes of exact agent distributions). In this paper, we present an intuitive yet efficient approach to generate arbitrary and precise group formations by sketching formation boundaries. Our approach can automatically compute the desired position of each agent in the target formation and generate the agent correspondences between keyframes. When high-level group formations need to be formed on-the-fly in a dynamic environment such as "switching to the circle formation at about one hundred meters ahead", our algorithm will coordinate and compute appropriate actions for each agent by seamlessly fusing local formation dynamics and global group locomotion. Through a number of experiments, we demonstrate that our approach is efficient and adaptive to variations of group scales (i.e., number of agents), group positions, and environment obstacles. Copyright held by authors.

关键词： Three dimensional computer graphics

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Perceptually guided expressive facial animation 8

Perceptually guided expressive facial animation

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8th ACM SIGGRAPH/Eurographics Symposium on computer Animation, SCA 2008

作者： Deng, Zhigang Ma, Xiaohan Computer Graphics and Interactive Media Lab Department of Computer Science University of Houston HoustonTX United States

ISBN: (纸本)9783905674101

Most of current facial animation approaches largely focus on the accuracy or efficiency of their algorithms, or how to optimally utilize pre-collected facial motion data. However, human perception, the ultimate measuring stick of the visual fidelity of synthetic facial animations, was not effectively exploited in these approaches. In this paper, we present a novel perceptually guided computational framework for expressive facial animation, by bridging objective facial motion patterns with subjective perceptual outcomes. First, we construct a facial perceptual metric (FacePEM) using a hybrid of region-based facial motion analysis and statistical learning techniques. The constructed FacePEM model can automatically measure the emotional expressiveness of a facial motion sequence. We showed how the constructed FacePEM model can be effectively incorporated into various facial animation algorithms. For the sake of clear demonstrations, we choose data-driven expressive speech animation generation and expressive facial motion editing as two concrete application examples. Through a comparative user study, we showed that comparing with the traditional facial animation algorithms, the introduced perceptually guided expressive facial animation algorithms can significantly increase the emotional expressiveness and perceptual believability of synthesized facial animations. © The Eurographics Association 2008.

关键词： Animation

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Style learning and transferring for facial animation editing 09

Style learning and transferring for facial animation editing

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Symposium on computer Animation 2009 - ACM SIGGRAPH / Eurographics Symposium

作者： Ma, Xiaohan Le, Binh Huy Deng, Zhigang Computer Graphics and Interactive Media Lab Department of Computer Science University of Houston Houston TX United States

ISBN: (纸本)9781605586106

Most of current facial animation editing techniques are frame-based approaches (i.e., manually edit one keyframe every several frames), which is ineffective, time-consuming, and prone to editing inconsistency. In this paper, we present a novel facial editing style learning framework that is able to learn a constraint-based Gaussian Process model from a small number of facial-editing pairs, and then it can be effectively applied to automate the editing of the remaining facial animation frames or transfer editing styles between different animation sequences. Comparing with the state of the art, multiresolution-based mesh sequence editing technique, our approach is more flexible, powerful, and adaptive. Our approach can dramatically reduce the manual efforts required by most of current facial animation editing approaches. © 2009 ACM.

关键词： Animation

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Pixel Memories: Do Lifelog Summaries Fail to Enhance Memory but Offer Privacy-Aware Memory Assessments? 25

Pixel Memories: Do Lifelog Summaries Fail to Enhance Memory ...

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Proceedings of the 2025 CHI Conference on Human Factors in Computing Systems

作者： Passant Elagroudy Rufat Rzayev Tonja-Katrin Machulla Huy Viet Le Tilman Dingler Lars Lischke Sarah Clinch Geoffrey Ward Albrecht Schmidt German Research Centre for Artificial Intelligence (DFKI) Kaiserslautern Germany and RPTU Kaiserslautern Kaiserslautern Germany Interactive Media Lab Dresden TUD Dresden University of Technology Dresden Germany Institute for Media Research TU Chemnitz Chemnitz Germany University of Stuttgart Stuttgart Germany Industrial Design Engineering Delft University of Technology Delft Netherlands User Centric Data Science Vrije Universiteit Amsterdam Amsterdam Netherlands Department of Computer Science The University of Manchester Manchester United Kingdom Department of Psychology University of Essex Essex United Kingdom LMU Munich Munich Germany

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Eyes-free touch command support for pen-based digital whiteboards via handheld devices 15

Eyes-free touch command support for pen-based digital whiteb...

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10th ACM International Conference on interactive Tabletops and Surfaces, ITS 2015

作者： Matulic, Fabrice Husmann, Maria Walter, Seraiah Norrie, Moira C. Interactive Media Lab Technische Universität Dresden Germany Department of Computer Science ETH Zurich Switzerland

ISBN: (纸本)9781450338998

Digital whiteboards that only sense pen input are limited in their interactive capabilities. One way to artificially add touch support is through personal mobile devices, which people carry with them. This work investigates how smartphones can be used as portable quick-access toolboxes held by the non-dominant hand to provide assistive touch commands for pen-driven whiteboard tasks. We developed two interface designs, one based on a classic remote with standard GUI controls and another optimised for eyes-free operation to eliminate gaze shifts between the two devices. In a controlled evaluation based on an established mode-switching study protocol, we compare the two phone inter-faces and a baseline technique consisting of a pen-triggered popup menu on the whiteboard. Our results show a superior efficiency of the phone UIs over the popup. The eyes-free UI only partially performed better than the classic interface at the subtask level after subtracting the costs of errors. © Copyright 2015 ACM.

关键词： Digital devices

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Identifying active subgroups in online communities 07

Identifying active subgroups in online communities

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2007 Conference of the Center for Advanced Studies on Collaborative Research, CASCON '07

作者： Chin, Alvin Chignell, Mark Department of Computer Science Interactive Media Lab. University of Toronto Canada Dept. of Mech. and Industrial Engineering Interactive Media Lab. University of Toronto Canada

As online communities proliferate, methods are needed to explore and capture patterns of activity within them. This paper focuses on the problem of identifying active subgroups within online com-munities. k-plex analysis and hierarchical clustering are used to identify and contrast subgroups, and the methodology is demonstrated in a case study involving the TorCamp Google group community. We assessed the validity of the subgroups obtained in the case study by comparing them with the members' experienced sense of community, and their self-reported acquaintanceships. Results suggest that active subgroups of people not only interact with each other at a higher rate, but also have a greater experienced sense of community. It is concluded that detection of active subgroups in online communities can be implemented widely using automated tools for analyzing the social networks implied by online interactions. Copyright © 2007 Alvin Chin and Mark Chignell.

关键词： Online systems

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A social hypertext model for finding community in blogs 06

A social hypertext model for finding community in blogs

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Seventeenth ACM Conference on Hypertext and Hypermedia, HT'06

作者： Chin, Alvin Chignell, Mark Interactive Media Lab Department of Computer Science University of Toronto Toronto Ont. Canada Interactive Media Lab Department of Mechanical and Industrial Engineering University of Toronto Toronto Ont. Canada

ISBN: (纸本)1595934170

Blogging has become the newest communication medium for creating a virtual community, a set of blogs linking back and forth to one another's postings, while discussing common topics. In this paper, we examine how communities can be discovered through interconnected blogs as a form of social hypertext [14]. We propose a method and model that detects structures of community in the social network of blogs by integrating McMillan and Chavis' sense of community [26] along with network analysis [8, 11]. From the model, we measure community in the blogs by aligning centrality measures from social network analysis [17] with measures of sense of community obtained using behavioural surveys. We then illustrate the use of this approach with a case study built around an independent music blog. The strength of community measures were found to be well aligned with the network structure, based on centrality measures. Even though the sample size from the case study was small, once the structure and measure of communities are calibrated according to our social hypertext model, communities can be automatically found and measured for other blogs without the need for behavioural surveys. Copyright 2006 ACM.

关键词： Websites

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Identifying subcommunities using cohesive subgroups in social hypertext 07

Identifying subcommunities using cohesive subgroups in socia...

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Hypertext 2007: 18th ACM Conference on Hypertext and Hypermedia, HT'07

作者： Chin, Alvin Chignell, Mark Interactive Media Lab. Department of Computer Science University of Toronto Toronto Ont. Canada Interactive Media Lab. Department of Mechanical and Industrial Engineering University of Toronto Toronto Ont. Canada

ISBN: (纸本)1595938206

Web pages can be modeled as nodes in a social network, and hyperlinks between pages form links (relationships) between the nodes. Links may take the form of comments, for example on blogs, creating explicit connections between authors and readers. In this paper, we describe a novel methodology and framework for identifying subcommunities as cohesive subgroups of n-cliques and k-plexes within social hypertext. We apply our methodology to a group of computer technologists in Toronto called TorCamp who communicate using a Google group. K-plex analysis is then used to identify a group of people that forms a subcommunity within the larger community. The results are then validated against the experienced sense of community of people inside and outside the subcommunity. Statistically significant differences in experienced sense of community are found, with people within the subcommunity showing higher levels of perceived influence and emotional connection. Copyright 2007 ACM.

关键词： Hypertext systems

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An approach for robot-assisted biosensing: Demonstration with MRI-guided MR spectroscopy

An approach for robot-assisted biosensing: Demonstration wit...

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10th IEEE International Workshop on Biomedical Engineering, BioEng 2011

作者： Sonmez, Ahmet E. Hedayati, Yousef Webb, Andrew G. Deng, Zhigang Navkar, Nikhil Tsekos, Nikolaos V. Medical Robotics Laboratory Department of Computer Science University of Houston Houston TX 77204 United States Computer Graphics and Interactive Media Laboratory Department of Computer Science University of Houston Houston TX 77204 United States Department of Radiology Leiden University Medical Centre Leiden Netherlands

ISBN: (纸本)9781457705526

Emerging and established methods, such as optical imaging and MR spectroscopy (MRS), offer new opportunities for in situ biosensing. The limited tissue penetration of these modalities can be addressed by locally placing the sensor via minimally invasive trans-needle or trans-catheter access. This work introduces a generic system that mechanically scans an area of interest with a sensor, capable of generating 1D scans while registering them to a guiding modality. computer simulations illustrate the operation of this approach for a miniature RF coil as the mechanically scanned biosensor. Experimental studies demonstrated the approach on phantoms, using MRI as the guiding modality, and an MR-compatible manipulator, which carried a miniature RF coil, was used to scan and collect MRS and generated 1D MRS scans co-registered to the guiding MRI. © 2011 IEEE.

关键词： Robotics

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