JVRC 13: Joint Virtual Reality Conference of EGVE - EuroVR

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https://diglib.eg.org/handle/10.2312/2146

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Browsing JVRC 13: Joint Virtual Reality Conference of EGVE - EuroVR by Subject "Artificial"

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    Background Motion, Clutter, and the Impact on Virtual Object Motion Perception in Augmented Reality
    (The Eurographics Association, 2013) Ferrer, Vicente; Yang, Yifan; Perdomo, Alex; Quarles, John; Betty Mohler and Bruno Raffin and Hideo Saito and Oliver Staadt
    Background motion and visual clutter are present in almost all augmented reality applications. However, there is minimal prior work that has investigated the effects that background motion and clutter (e.g., a busy city street) can have on the perception of virtual object motion in augmented reality. To investigate these issues, we conducted an experiment in which participants' perceptions of changes in overlaid virtual object velocity were tested with several levels of background motion, background clutter, virtual object motion, and virtual object clutter. Our experiment offers a novel approach to assessing virtual object motion perception and gives new insights into the impact that background clutter and motion has on perception in augmented reality.
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    Exploring Distant Objects with Augmented Reality
    (The Eurographics Association, 2013) Tatzgern, Markus; Grasset, Raphael; Veas, Eduardo; Kalkofen, Denis; Seichter, Hartmut; Schmalstieg, Dieter; Betty Mohler and Bruno Raffin and Hideo Saito and Oliver Staadt
    Augmented reality (AR) enables users to retrieve additional information about the real world objects and locations. Exploring such location-based information in AR requires physical movement to different viewpoints, which may be tiring and even infeasible when viewpoints are out of reach. In this paper, we present object-centric exploration techniques for handheld AR that allow users to access information freely using a virtual copy metaphor to explore large real world objects. We evaluated our interfaces in controlled conditions and collected first experiences in a real world pilot study. Based on our findings, we put forward design recommendations that should be considered by future generations of location-based AR browsers, 3D tourist guides, or in situated urban planning.
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    Personalized Animatable Avatars from Depth Data
    (The Eurographics Association, 2013) Mashalkar, Jai; Bagwe, Niket; Chaudhuri, Parag; Betty Mohler and Bruno Raffin and Hideo Saito and Oliver Staadt
    Abstract We present a method to create virtual character models of real users from noisy depth data. We use a combination of four depth sensors to capture a point cloud model of the person. Direct meshing of this data often creates meshes with topology that is unsuitable for proper character animation. We develop our mesh model by fitting a single template mesh to the point cloud in a two-stage process. The first stage fitting involves piecewise smooth deformation of the mesh, whereas the second stage does a finer fit using an iterative Laplacian framework. We complete the model by adding properly aligned and blended textures to the final mesh and show that it can be easily animated using motion data from a single depth camera. Our process maintains the topology of the original mesh and the proportions of the final mesh match the proportions of the actual user, thus validating the accuracy of the process. Other than the depth sensor, the process does not require any specialized hardware for creating the mesh. It is efficient, robust and is mostly automatic.
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    Semantic Modelling of Interactive 3D Content
    (The Eurographics Association, 2013) Flotynski, Jakub; Walczak, Krzysztof; Betty Mohler and Bruno Raffin and Hideo Saito and Oliver Staadt
    Interactive three-dimensional content is the primary element of virtual reality (VR) and augmented reality (AR) systems. The increasing complexity and the use of VR/AR systems in various application domains requires efficient methods of creating, searching and combining interactive 3D content, which could be used by people with different specialities, who are not required to be IT-experts. The Semantic Web approach enables description of web resources with common semantic concepts. However, the use of semantic concepts may also facilitate creation of 3D content. The main contribution of this paper is a method of semantic modelling of interactive 3D content. The method leverages semantic constraints between different components of 3D content as well as representations of 3D content at different levels of abstraction. It can be used with a multitude of domain-specific ontologies and knowledge bases to simplify creating and searching of reusable semantic 3D content components and assembling complex 3D scenes from independent distributed elements.
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    Visual Attention to Wayfinding Aids in Virtual Environments
    (The Eurographics Association, 2013) Bertrand, Jeffrey; Ebrahimi, Elham; Wachter, Aliceann; Luo, Jun; Babu, Sabarish V.; Duchowski, Andrew T.; Meehan, Nancy; Gramopadhye, Anand K.; Betty Mohler and Bruno Raffin and Hideo Saito and Oliver Staadt
    In an empirical evaluation, we examined participants' visual attention allocation to a dynamic wayfinding map in a complex simulation meant to educate medical practitioners in a hand hygiene protocol. Complex virtual environments (VEs) are novel types of virtual worlds that embody large spaces, interactive virtual humans, static and dynamic virtual entities, and intricate tasks that simulate real-world settings. Previous investigations of wayfinding aids have focused on the evaluation of spatial orientation, knowledge acquisition, and usage. We employed an eye tracker and created visualization tools to quantitatively and qualitatively analyze participants' visual attention to the wayfinding aid in our simulation. Results suggest that the proportion of time of gaze, total gaze count, and gaze transitions between various elements of the VE are altered with the use of the wayfinding aid. Participants also tend to employ innovative visual strategies in order to efficiently plan routes and accomplish tasks in the VE.