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检索条件"任意字段=Proceedings of the 22nd Annual ACM Conference on Computer Graphics and Interactive Techniques"

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Scalable Metadata In- and Output for Multi-platform Data Annotation Applications

Scalable Metadata In- and Output for Multi-platform Data Ann...

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22nd IEEE Virtual Reality conference (VR)

作者： Pick, Sebastian Gebhardt, Sascha Hentschel, Bernd Kuhlen, Torsten W. Rhein Westfal TH Aachen Virtual Real Grp Aachen Germany JARA High Performance Comp Aachen Germany Julich Supercomp Ctr Julich Germany

ISBN: (纸本)9781479917273

Metadata in- and output are important steps within the data annotation process. However, selecting techniques that effectively facilitate these steps is non-trivial, especially for applications that have to run on multiple virtual reality platforms. Not all techniques are applicable to or available on every system, requiring to adapt workflows on a per-system basis. Here, we describe a metadata handling system based on Android's Intent system that automatically adapts workflows and thereby makes manual adaption needless.

关键词： 1.3.7 [computer graphics]: Three-Dimensional graphics and Realism Virtual reality H.5.2 [Information Interfaces and Presentation]: User Interfaces Graphical user interfaces

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3D Node Localization from Node-to-Node Distance Information using Cross-Entropy Method

3D Node Localization from Node-to-Node Distance Information ...

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22nd IEEE Virtual Reality conference (VR)

作者： Ukawa, Shohei Shinada, Tatsuya Hashimoto, Masanori Itoh, Yuichi Onoye, Takao Osaka Univ Dept Informat Syst Engn Suita Osaka 565 Japan

ISBN: (纸本)9781479917273

This paper proposes a 3D node localization method that uses cross-entropy method for the 3D modeling system. The proposed localization method statistically estimates the most probable positions overcoming measurement errors through iterative sample generation and evaluation. The generated samples are evaluated in parallel, and then a significant speedup can be obtained. We also demonstrate that the iterative sample generation and evaluation performed in parallel are highly compatible with interactive node movement.

关键词： 1.3.5 [computer graphics]: Computational Geometry and Object Modeling-Physically based modeling H.5.2 [Information Interfaces and Presentation]: User Interfaces-Input Devices and Strategies

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HorizontalDragger: a Freehand Remote Selector for Object Acquisition

HorizontalDragger: a Freehand Remote Selector for Object Acq...

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22nd IEEE Virtual Reality conference (VR)

作者： Wu, Siju Chellali, Amine Otmane, Samir Moreau, Guillaume Evry Univ IBISC Evry France Ecole Cent Nantes CERMA Nantes France

ISBN: (纸本)9781479917273

Interaction with computers using freehand gestures becomes more and more popular. However, it is hard to make precise inputs by making gestures in air without a physical support. In this paper, we present HorizontalDragger, a new selection technique aimed to improve the selection precision by converting the 2D selection problem into a 1D selection problem. After setting a region of interest in the display, all the objects inside the region are considered as potential targets. The user can drag the index finger horizontally to choose the desired target.

关键词： I.3.6 [computer graphics]: Methodology and techniques-Interaction techniques

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Touch Sensing on Non-Parametric Rear-Projection Surfaces: A Physical-Virtual Head for Hands-On Healthcare Training

Touch Sensing on Non-Parametric Rear-Projection Surfaces: A ...

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22nd IEEE Virtual Reality conference (VR)

作者： Hochreiter, Jason Daher, Salam Nagendran, Arjun Gonzalez, Laura Welch, Greg Univ Cent Florida Orlando FL 32816 USA

ISBN: (纸本)9781479917273

We demonstrate a generalizable method for unified multitouch detection and response on a human head-shaped surface with a rear projection animated 3D face. The method helps achieve hands-on touch-sensitive training with dynamic physical-virtual patient behavior. The method, which is generalizable to other non-parametric rear-projection surfaces, requires one or more infrared (IR) cameras, one or more projectors, IR light sources, and a rear-projection surface. IR light reflected off of human fingers is captured by cameras with matched IR pass filters, allowing for the localization of multiple finger touch events. These events are tightly coupled with the rendering system to produce auditory and visual responses on the animated face displayed using the projector(s), resulting in a responsive, interactive experience. We illustrate the applicability of our physical prototype in a medical training scenario.

关键词： H.5.1 [Information Interfaces and Presentation]: Multimedia Information Systems Animations, Artificial, Augmented Virtual Realities: I.3.7 [computer graphics]: ThreeDimensional graphics and Realism Virtual Reality I. 3.8 [computer graphics]: Applications

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Coupled-Clay: Physical-Virtual 3D Collaborative Interaction Environment

Coupled-Clay: Physical-Virtual 3D Collaborative Interaction ...

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22nd IEEE Virtual Reality conference (VR)

作者： Oezacar, Kasen Hagiwara, Takuma Huang, Jiawei Takashiina, Kazuki Kitamura, Yoshifumi Tohoku Univ Elect Commun Res Inst Sendai Miyagi 980 Japan

ISBN: (纸本)9781479917273

We propose Coupled-clay, a bi-directional 3D collaborative interactive environment that supports the 3D modeling work between groups of users at remote locations. Coupled-clay consists of two network-connected workspaces, the Physical Interaction Space and the Virtual Interaction Space. The physical interaction space allows a user to directly manipulate a physical object whose shape and position are precisely tracked. This tracked 3D information is transferred to the virtual interaction space in real time. The virtual interaction space is made of an interactive multi-user stereoscopic 3D tabletop, or other 3D displays with adequate interaction device. The users at the virtual interaction space observe the virtual 3D object which corresponds to the physical object and manipulate its geometrical attributes (e.g., translation, rotation and scaling). Additionally, they can control the graphical attributes of the virtual object such as color and texture. Information about changes in geometrical and graphical attributes are sent back to the physical interaction space in real time and reflected to the object in the physical interaction space by a robotic arm and a top-mounted projector. Coupled-clay can be used to remotely collaborate on 3D modeling tasks such as between a skilled designer and novice learners. This paper details our Coupled-clay implementation and presents its interaction capabilities.

关键词： H.5.3 [INFORMATION INTERFACES And PRESENTATION]: Group and Organization Interfaces Collaborative computing 1.3.7 [Computing Methodologies]: computer graphics Three-Dimensional graphics and Realism

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Does Virtual Reality Affect Visual Perception Of Egocentric Distance?

Does Virtual Reality Affect Visual Perception Of Egocentric ...

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22nd IEEE Virtual Reality conference (VR)

作者： Rousset, Thomas Bourdin, Christophe Goulon, Cedric Monnoyer, Jocelyn Vercher, Jean-Louis Aix Marseille Univ CNRS ISM UMR 7287 F-13288 Marseille France Velizy Villacoublay PSA Peugeot Citroen Velizy Villacoublay France

ISBN: (纸本)9781479917273

Virtual reality (driving simulators) tends to generalize for the study of human behavior in mobility. It is thus crucial to ensure that perception of space and motion is little or not affected by the virtual environment (VE). The aim of this study was to determine a metrics of distance perception in VEs and whether this metrics depends on interactive factors: stereoscopy and motion parallax. After a training session, participants were asked, while driving, to estimate the relative location (5 to 80 m) of a car on the same road. The overall results suggest that distance perception in this range does not depend on interactive factors. In average, as generally reported, subjects underestimated the distances whatever the vision conditions. However, the study revealed a large interpersonal variability: two profiles of participants were defined, those who quite accurately perceived distances in VR and those who underestimated distances as usually reported. Overall, this classification was correlated to the level of performance of participants during the training phase. Furthermore, learning performance is predictive of the behavior of participants.

关键词： Driving simulation distance perception stereoscopy parallax variability J.4 [computer Applications]: SOCIAL And BEHAVIORAL SCIENCES-Psychology I.3.7 [3D graphics and Realism]: Virtual Reality

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The Effect of Visual Display Properties and Gain Presentation Mode on the Perceived Naturalness of Virtual Walking Speeds

The Effect of Visual Display Properties and Gain Presentatio...

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22nd IEEE Virtual Reality conference (VR)

作者： Nilsson, Niels Christian Serafin, Stefania Nordahl, Rolf Aalborg Univ Aalborg Denmark

ISBN: (纸本)9781479917273

Individuals tend to find realistic walking speeds too slow when relying on treadmill walking or Walking-In-Place (WIP) techniques for virtual travel. This paper details three studies investigating the effects of visual display properties and gain presentation mode on the perceived naturalness of virtual walking speeds: The first study compared three different degrees of peripheral occlusion;the second study compared three different degrees of perceptual distortion produced by varying the geometric field of view (GFOV);and the third study compared three different ways of presenting visual gains. All three studies compared treadmill walking and WIP locomotion. The first study revealed no significant main effects of peripheral occlusion. The second study revealed a significant main effect of GFOV, suggesting that the GFOV size may be inversely proportional to the degree of underestimation of the visual speed. The third study found a significant main effect of gain presentation mode. Allowing participants to interactively adjust the gain led to a smaller range of perceptually natural gains and this approach was significantly faster. However, the efficiency may come at the expense of confidence. Generally the lower and upper bounds of the perceptually natural speeds were higher for treadmill walking than WIP. However, not all differences were statistically significant.

关键词： H.1.2 [Information Systems]: User/Machine Systems Human factors I.3.7 [computer graphics]: Three-Dimenshional graphics and Realism Virtual Reality

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A parallel query engine for interactive spatiotemporal analysis 14

A parallel query engine for interactive spatiotemporal analy...

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22nd acm SIGSPATIAL International conference on Advances in Geographic Information Systems, acm SIGSPATIAL GIS 2014

作者： Sathe, Mihir Knoblock, Craig A. Chiang, Yao-Yi Harris, Aaron Dept. of Computer Science Univ. of Southern California United States Information Sciences Institute Univ. of Southern California United States Spatial Sciences Institute Univ. of Southern California United States Dept. of Mech. Engineering Univ. of Southern California United States

ISBN: (纸本)9781450331319

Given the increasing popularity and availability of location tracking devices, large quantities of spatiotemporal data are available from many different sources. Quick interactive analysis of such data is important in order to understand the data, identify patterns, and eventually make a marketable product. Since the data do not necessarily follow the relational model and may require flexible processing possibly using advanced machine learning techniques, spatial databases or similar query tools do not make the best means for such analysis. Moreover, the high complexity of geometric operations makes the quick interactive analysis very difficult. In this paper, we present a highly flexible functional query engine that 1) works with multiple schema types, 2) provides fast response times by spatiotemporal indexing and parallelization, 3) helps understand the data using visualizations and 4) is highly extensible to easily add complex functionality. To demonstrate its usefulness, we use our tool to solve a real world problem of crime pattern analysis in Los Angeles County and compare the process with other well known tools. Copyright 2014 acm.

关键词： Visualization

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Taghreed: A system for querying, analyzing, and visualizing geotagged microblogs 14

Taghreed: A system for querying, analyzing, and visualizing ...

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22nd acm SIGSPATIAL International conference on Advances in Geographic Information Systems, acm SIGSPATIAL GIS 2014

作者： Magdy, Amr Alarabi, Louai Al-Harthi, Saif Musleh, Mashaal Ghanem, Thanaa M. Ghani, Sohaib Mokbel, Mohamed F. KACST GIS Technology Innovation Center Umm Al-Qura University Makkah Saudi Arabia Department of Computer Science and Engineering University of Minnesota MinneapolisMN United States Department of Information and Computer Sciences Metropolitan State University Saint PaulMN United States

ISBN: (纸本)9781450331319

This paper presents Taghreed;a full-fledged system for efficient and scalable querying, analyzing, and visualizing geo- tagged microblogs, e.g., tweets. Taghreed supports arbitrary queries on a large number (Billions) of microblogs that go up to several months in the past. Taghreed consists of four main components: (1) Indexer, (2) query engine, (3) recovery manager, and (4) visualizer. Taghreed indexer efficiently digests incoming microblogs with high arrival rates in light memory-resident indexes. When the memory be- comes full, a flushing policy manager transfers the mem- ory contents to disk indexes which are managing Billions of microblogs for several months. On memory failure, the recovery manager restores the system status from replicated copies for the main-memory content. Taghreed query engine consists of two modules: a query optimizer and a query processor. The query optimizer generates an optimal query plan to be executed by the query processor through efficient retrieval techniques to provide low query response, i.e., order of milliseconds. Taghreed visualizer allows end users to issue a wide variety of spatiotemporal queries. Then, it graphically presents the answers and allows interactive exploration through them. Taghreed is the first system that addresses all these challenges collectively for microblogs data. In the paper, each system component is described in detail. Copyright 2014 acm.

关键词： Managers

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Interactions in the Air: Adding Further Depth to interactive Tabletops 09

Interactions in the Air: Adding Further Depth to Interactive...

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22nd annual acm Symposium on User Interface Software and Technology

作者： Hilliges, Otmar Izadi, Shahram Wilson, Andrew D. Hodges, Steve Garcia-Mendoza, Armando Butz, Andreas Microsoft Res Cambridge Cambridge CB3 0FB England

ISBN: (纸本)9781605587455

Although interactive surfaces have many unique and compelling qualities, the interactions they support are by their very nature bound to the display surface. In this paper we present a technique for users to seamlessly switch between interacting on the tabletop surface to above it. Our aim is to leverage the space above the surface in combination with the regular tabletop display to allow more intuitive manipulation of digital content in three-dimensions. Our goal is to design a technique that closely resembles the ways we manipulate physical objects in the real-world;conceptually, allowing virtual objects to be 'picked up' off the tabletop surface in order to manipulate their three dimensional position or orientation. We chart the evolution of this technique, implemented on two rear projection-vision tabletops. Both use special projection screen materials to allow sensing at significant depths beyond the display. Existing and new computer vision techniques are used to sense hand gestures and postures above the tabletop, which can be used alongside more familiar multi-touch interactions. Interacting above the surface in this way opens up many interesting challenges. In particular it breaks the direct interaction metaphor that most tabletops afford. We present a novel shadow-based technique to help alleviate this issue. We discuss the strengths and limitations of our technique based on our own observations and initial user feedback, and provide various insights from comparing, and contrasting, our tabletop implementations.

关键词： Surfaces switchable diffusers holoscreen depth-sensing cameras 3D graphics computer vision

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