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检索条件"主题词=Visualization Design and evaluation methods"

共 222 条记录，以下是141-150 订阅

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Quality Metrics for Symmetric Graph Drawings 13

Quality Metrics for Symmetric Graph Drawings

引用

IEEE Pacific visualization Symposium (PacificVis)

作者： Meidiana, Amyra Hong, Seok-Hee Eades, Peter Keim, Daniel Univ Sydney Sydney NSW Australia Univ Konstanz Constance Germany

ISBN: (纸本)9781728156972

In this paper, we present a framework for quality metrics that measure symmetry, that is, how faithfully a drawing of a graph displays the ground truth geometric automorphisms as symmetries. The quality metrics are based on group theory as well as geometry. More specifically, we introduce two types of symmetry quality metrics for displaying: (1) a single geometric automorphism as a symmetry (axial or rotational) and (2) a group of geometric automorphisms (cyclic or dihedral). We also present algorithms to compute the symmetry quality metrics in O(nlogn) time. We validate our symmetry quality metrics using deformation experiments. We then use the metrics to evaluate existing graph layouts to compare how faithfully they display geometric automorphisms of a graph as symmetries.

关键词： Human-centered computing visualization visualization techniques Graph drawing Human-centered computing visualization visualization design and evaluation methods

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Detecting System Errors in Virtual Reality Using EEG Through Error-Related Potentials 27

Detecting System Errors in Virtual Reality Using EEG Through...

引用

27th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR)

作者： Si-Mohammed, Hakim Lopes-Dias, Catarina Duarte, Maria Argelaguet, Ferran Jeunet, Camille Casiez, Gery Mueller-Putz, Gernot R. Lecuyer, Anatole Scherer, Reinhold Univ Rennes INRIA CNRS IRISA Rennes France Graz Univ Technol Inst Neural Engn Graz Austria Univ Lisbon Fac Sci Lisbon Portugal Univ Toulouse CLLE Lab CNRS Toulouse France Univ Lille CNRS Cent Lille INRIA Lille France Univ Essex Sch Comp Sci & Elect Engn Colchester Essex England

ISBN: (纸本)9781728156088

When persons interact with the environment and experience or witness an error (e.g. an unexpected event), a specific brain pattern, known as error-related potential (ErrP) can be observed in the electroencephalographic signals (EEG). Virtual Reality (VR) technology enables users to interact with computer-generated simulated environments and to provide multi-modal sensory feedback. Using VR systems can, however, be error-prone. In this paper, we investigate the presence of ErrPs when Virtual Reality users face 3 types of visualization errors: (Te) tracking errors when manipulating virtual objects, (Fe) feedback errors, and (Be) background anomalies. We conducted an experiment in which 15 participants were exposed to the 3 types of errors while performing a center-out pick and place task in virtual reality. The results showed that tracking errors generate error-related potentials, the other types of errors did not generate such discernible patterns. In addition, we show that it is possible to detect the ErrPs generated by tracking losses in single trial, with an accuracy of 85%. This constitutes a first step towards the automatic detection of error-related potentials in VR applications, paving the way to the design of adaptive and self-corrective VR/AR applications by exploiting information directly from the user's brain.

关键词： Human-centered computing visualization visualization techniques Treemaps Human-centered computing visualization visualization design and evaluation methods

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Eye-Gaze Activity in Crowds: Impact of Virtual Reality and Density 27

Eye-Gaze Activity in Crowds: Impact of Virtual Reality and D...

引用

27th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR)

作者： Berton, Florian Hoyet, Ludovic Olivier, Anne-Helene Bruneau, Julien Le Meur, Olivier Pettre, Julien Univ Rennes M2S Irisa InriaCNRS Rennes France

ISBN: (纸本)9781728156088

When we are walking in crowds, we mainly use visual information to avoid collisions with other pedestrians. Thus, gaze activity should be considered to better understand interactions between people in a crowd. In this work, we use Virtual Reality (VR) to facilitate motion and gaze tracking, as well as to accurately control experimental conditions, in order to study the effect of crowd density on eye-gaze behavior. Our motivation is to better understand how interaction neighborhood (i.e., the subset of people actually influencing one's locomotion trajectory) changes with density. To this end, we designed two experiments. The first one evaluates the biases introduced by the use of VR on the visual activity when walking among people, by comparing eye-gaze activity while walking in a real and virtual street. We then designed a second experiment where participants walked in a virtual street with different levels of pedestrian density. We demonstrate that gaze fixations are performed at the same frequency despite increases in pedestrian density, while the eyes scan a narrower portion of the street. These results suggest that in such situations walkers focus more on people in front and closer to them. These results provide valuable insights regarding eye-gaze activity during interactions between people in a crowd, and suggest new recommendations in designing more realistic crowd simulations.

关键词： Gaze Activity Locomotion Crowd Virtual Reality Eye-tracking Collision Avoidance Human-centered computing visualization visualization techniques Treemaps Human-centered computing visualization visualization design and evaluation methods

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Relative Room Size Judgments in Impossible Spaces

Relative Room Size Judgments in Impossible Spaces

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27th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR)

作者： Barwulor, Catherine Robb, Andrew Clemson Univ Clemson SC 29631 USA

ISBN: (数字)9781728165325

ISBN: (纸本)9781728165325

In VR, "impossible spaces" allow virtual rooms to occupy overlapping portions of physical space. We investigated how size judgments of impossible spaces are influenced by the ratio of the sizes of over-lapping rooms. Participants (n=36) were randomly assigned to one of three conditions and completed 13 trials. Participants' reports accurately reflected the true ratio of the rooms in all conditions;however, participants reported less extreme ratios as the ratio increased. The results suggest that important spatial relationships are preserved in impossible spaces, namely 1) judged sizes of individual rooms, and 2) judgments concerning the relative sizes of different rooms.

关键词： Human-centered computing visualization visualization techniques Treemaps Human-centered computing visualization visualization design and evaluation methods

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Beyond Trust Building - Calibrating Trust in Visual Analytics

Beyond Trust Building - Calibrating Trust in Visual Analytic...

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IEEE Workshop on TRust and EXpertise in Visual Analytics (TREX)

作者： Han, Wenkai Schulz, Hans-Jorg Aarhus Univ Aarhus Denmark

ISBN: (纸本)9781728185149

Trust is a fundamental factor in how users engage in interactions with Visual Analytics (VA) systems. While the importance of building trust to this end has been pointed out in research, the aspect that trust can also be misplaced is largely ignored in VA so far. This position paper addresses this aspect by putting trust calibration in focus - i.e., the process of aligning the user's trust with the actual trustworthiness of the VA system. To this end, we present the trust continuum in the context of VA, dissect important trust issues in both VA systems and users, as well as discuss possible approaches that can build and calibrate trust.

关键词： Human-centered computing visualization visualization theory, concepts and paradigms Human-centered computing HCI theory, concepts and models visualization design and evaluation methods

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ClaimViz: Visual Analytics for Identifying and Verifying Factual Claims

ClaimViz: Visual Analytics for Identifying and Verifying Fac...

引用

IEEE visualization Conference (VIS)

作者： Rony, Md Main Uddin Hoque, Enamul Hassan, Naeemul Univ Maryland College Pk MD 20742 USA York Univ N York ON Canada

ISBN: (纸本)9781728180144

Verifying a factual claim made by public figures, aka fact-checking, is a common task of the journalists in the newsrooms. One critical challenge that fact-checkers face is- they have to swift through a large amount of text to find claims that are check-worthy. While there exist some computational methods for automating the fact-checking process, little research has been done on how a system should combine such techniques with visualizations to assist fact-checkers. ClaimViz is a visual analytic system that integrates natural language processing and machine learning methods with interactive visualizations to facilitate the fact-checking process. The design of ClaimViz is based on analyzing the requirements of real fact-checkers and our case studies demonstrate how the system can help users to effectively spot and verify claims.

关键词： Human-centered computing visualization visualization design and evaluation methods

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Space-Reclaiming Icicle Plots 13

Space-Reclaiming Icicle Plots

引用

IEEE Pacific visualization Symposium (PacificVis)

作者： van de Wetering, Huub Klaassen, Nico Burch, Michael Tech Univ Eindhoven Eindhoven Netherlands

ISBN: (纸本)9781728156972

This paper describes the space-reclaiming icicle plots, hierarchy visualizations based on the visual metaphor of icicles. As a novelty, our approach tries to reclaim empty space in all hierarchy levels. This reclaiming results in an improved visibility of the hierarchy elements especially those in deeper levels. We implemented an algorithm that is capable of producing more space-reclaiming icicle plot variants. Several visual parameters can be tweaked to change the visual appearance and readability of the plots: among others, a space-reclaiming parameter, an empty space shrinking parameter, and a gap size. To illustrate the usefulness of the novel visualization technique we applied it, among others, to an NCBI taxonomy dataset consisting of more than 300,000 elements and with maximum depth 42. Moreover, we explore the parameter and design space by applying several values for the visual parameters. We also conducted a controlled user study with 17 participants and received qualitative feedback from 112 students from a visualization course.

关键词： Human-centered computing visualization visualization techniques- Human-centered computing visualization visualization design and evaluation methods

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Neurophysiological Effects of Presence in Calm Virtual Environments

Neurophysiological Effects of Presence in Calm Virtual Envir...

引用

27th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR)

作者： Dey, Arindam Phoon, Jane Saha, Shuvodeep Dobbins, Chelsea Billinghurst, Mark Univ Queensland Brisbane Qld Australia UQ Brisbane Qld Australia CSIR India Bengaluru India Univ South Australia Adelaide SA Australia

ISBN: (纸本)9781728165325

Presence, the feeling of being there, is an important factor that affects the overall experience of virtual reality. Presence is measured through post-experience subjective questionnaires. While questionnaires are a widely used method in human-based research, they suffer from participant biases, dishonest answers, and fatigue. In this paper, we measured the effects of different levels of presence (high and low) in virtual environments using physiological and neurological signals as an alternative method. Results indicated a significant effect of presence on both physiological and neurological signals.

关键词： Human-centered computing visualization visualization design and evaluation methods

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Ginput: a tool for fast hi-fi prototyping of gestural interactions in virtual reality

Ginput: a tool for fast hi-fi prototyping of gestural intera...

引用

19th IEEE International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Fonseca Jr, Jose Roberto Abreu, Jader Figueredo, Lucas Gomes Neto, Jose Teichrieb, Veronica Quintino, Jonysberg P. da Silva, Fabio Q. B. Santos, Andre L. M. Pinho, Helder Univ Fed Pernambuco Voxar Labs CIn Recife PE Brazil Univ Fed Pernambuco Projeto CIn Samsung Recife PE Brazil Univ Fed Pernambuco CIn Recife PE Brazil Samsung Inst Desenvolvimento Informat Brasilia DF Brazil

ISBN: (纸本)9781728176758

Gestural interfaces in virtual reality (VR) expand the design space for user interaction, allowing spatial metaphors with the environment and more natural and immersive experiences. Typically, machine learning approaches recognize gestures with models that rely on a large number of samples for the training phase, which is an obstacle for rapidly prototyping gestural interactions. In this paper, we propose a solution designed for hi-fi prototyping of gestures within a virtual reality environment through a high-level Domain-Specific Language (DSL), as a subset of the natural language. The proposed DSL allows non-programmer users to intuitively describe a broad domain of poses and connect them for compound gestures. Our DSL was designed to be general enough for multiple input classes, such as body tracking, hand tracking, head movement, motion controllers, and buttons. We tested our solution for wands with VR designers and developers. Results showed that the tool gives non-programmers the ability to prototype gestures with ease and refine its recognition within a few minutes.

关键词： Human-centered computing visualization visualization techniques Treemaps Human-centered computing visualization visualization design and evaluation methods

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DebateVis: Visualizing Political Debates for Non-Expert Users

DebateVis: Visualizing Political Debates for Non-Expert User...

引用

IEEE visualization Conference (VIS)

作者： South, Laura Schwab, Michail Beauchamp, Nick Wang, Lu Wihbey, John Borkin, Michelle A. Northeastern Univ Boston MA 02115 USA

ISBN: (纸本)9781728180144

Political debates provide an important opportunity for voters to observe candidate behavior, learn about issues, and make voting decisions. However, debates are generally broadcast late at night and last more than ninety minutes, so watching debates live can be inconvenient, if not impossible, for many potential viewers. Even voters who do watch debates may find themselves overwhelmed by a deluge of information in a substantive, issue-driven debate. Media outlets produce short summaries of debates, but these are not always effective as a method of deeply comprehending the policies candidates propose or the debate techniques they employ. In this paper we contribute reflections and results of an 18-month design study through an interdisciplinary collaboration with journalism and political science researchers. We characterize task and data abstractions for visualizing political debate transcripts for the casual user, and present a novel tool (DEBATEVis) to help non-expert users explore and analyze debate transcripts.

关键词： Human-centered computing visualization visualization design and evaluation methods

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