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Proceedings Paper

Motion parallax in immersive cylindrical display systems
Author(s): N. Filliard; G. Reymond; A. Kemeny; A. Berthoz
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Paper Abstract

Motion parallax is a crucial visual cue produced by translations of the observer for the perception of depth and selfmotion. Therefore, tracking the observer viewpoint has become inevitable in immersive virtual (VR) reality systems (cylindrical screens, CAVE, head mounted displays) used e.g. in automotive industry (style reviews, architecture design, ergonomics studies) or in scientific studies of visual perception. The perception of a stable and rigid world requires that this visual cue be coherent with other extra-retinal (e.g. vestibular, kinesthetic) cues signaling ego-motion. Although world stability is never questioned in real world, rendering head coupled viewpoint in VR can lead to the perception of an illusory perception of unstable environments, unless a non-unity scale factor is applied on recorded head movements. Besides, cylindrical screens are usually used with static observers due to image distortions when rendering image for viewpoints different from a sweet spot. We developed a technique to compensate in real-time these non-linear visual distortions, in an industrial VR setup, based on a cylindrical screen projection system. Additionally, to evaluate the amount of discrepancies tolerated without perceptual distortions between visual and extraretinal cues, a "motion parallax gain" between the velocity of the observer's head and that of the virtual camera was introduced in this system. The influence of this artificial gain was measured on the gait stability of free-standing participants. Results indicate that, below unity, gains significantly alter postural control. Conversely, the influence of higher gains remains limited, suggesting a certain tolerance of observers to these conditions. Parallax gain amplification is therefore proposed as a possible solution to provide a wider exploration of space to users of immersive virtual reality systems.

Paper Details

Date Published: 8 February 2012
PDF: 10 pages
Proc. SPIE 8289, The Engineering Reality of Virtual Reality 2012, 828904 (8 February 2012); doi: 10.1117/12.912477
Show Author Affiliations
N. Filliard, Lab. of Physiology of Perception and Action, CNRS, Collège de France (France)
Renault Technocentre (France)
G. Reymond, Renault Technocentre (France)
A. Kemeny, Renault Technocentre (France)
Arts et Métiers ParisTech, Lab. Electronique, Informatique et Image, CNRS (France)
A. Berthoz, Lab. of Physiology of Perception and Action, CNRS, Collège de France (France)

Published in SPIE Proceedings Vol. 8289:
The Engineering Reality of Virtual Reality 2012
Ian E. McDowall; Margaret Dolinsky, Editor(s)

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