Browsing by Author "Teo, Theophilus"

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    Evaluating Techniques to Share Hand Gestures for Remote Collaboration using Top-Down Projection in a Virtual Environment
    (The Eurographics Association, 2022) Teo, Theophilus; Sakurada, Kuniharu; Fukuoka, Masaaki; Sugimoto, Maki; Hideaki Uchiyama; Jean-Marie Normand
    Sharing hand gestures in a remote collaboration offers natural and expressive communication between collaborators. Proposed techniques allow sharing dependent (attached to something) or independent (no attachment) hand gestures in an immersive remote collaboration. However, there are research gaps for sharing hand gestures using different techniques and how it impacts user behaviour and performance. In this paper, we propose an evaluation study to compare sharing dependent and independent hand gestures. We developed a prototype, supporting three techniques of sharing hand gestures: Attached to Local, Attached to Object, and Independent Hands. Also, we use top-down projection, an easy-to-setup method to share a local user's environment with a remote user. We compared the three techniques and found that independent hands help a remote user guide a local user in an object interaction task quicker than hands attached to the local user. It also gives clearer instruction than dependent hands despite limited depth perception caused by top-down projection. A similar trend is also found in remote users' preferences.
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    An Integrated Ducted Fan-Based Multi-Directional Force Feedback with a Head Mounted Display
    (The Eurographics Association, 2022) Watanabe, Koki; Nakamura, Fumihiko; Sakurada, Kuniharu; Teo, Theophilus; Sugimoto, Maki; Hideaki Uchiyama; Jean-Marie Normand
    Adding force feedback to virtual reality applications enhances the immersive experience. We propose a prototype, featuring head-based multi-directional force feedback in a virtual environment. We designed the prototype by integrating four ducted fans into a head-mounted display. Our technical evaluation of the ducted fan revealed the force characteristics of the ducted fan, including presentable power, sound level, and latency. In the first part of our study, we investigated the minimum force that a user can perceive in different directions (forward/backward force; up/down/left/right rotational force). The result suggested the absolute detection threshold for each directional force. Following that, we evaluated the impact of using force feedback through an immersive flight simulation in the second part of our study. The result indicates that our technique significantly improved user enjoyment, comfort, and visual-and-tactile perception, and reduced simulator sickness in an immersive flight simulation.
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    Investigating Perception of Multiple Virtual Hands using Startle Response
    (The Eurographics Association, 2022) Mashiyama, Yuki; Fukuoka, Masaaki; Teo, Theophilus; Kondo, Ryota; Sugimoto, Maki; Theophilus Teo; Ryota Kondo
    Studies have been conducted to examine the human body perception of a whole body when having multiple bodies. In this paper, we investigate how does the sense of body ownership and the sense of agency change when a user synchronously moves multiple body parts in a virtual environment. Participants in a demonstration will perform a reaching task for 150 seconds by physically moving their right hands while visualised as one or nine hands in a virtual reality environment. At the end of the reaching task, a threat stimulus is triggered and participants' electromyography are measured as an objective index of the sense of body ownership. Finally, a short survey will be conducted to query the strength of the subjective sense of body ownership and agency.