Hyperstereopsis in helmet-mounted NVDs : slope perception

Stuart, Geoffrey W., Flanagan, Patrick and Gibbs, Peter 2007, Hyperstereopsis in helmet-mounted NVDs : slope perception, in SPIE 2007 : Head- and helmet-mounted displays XII : design and applications : 10-11 April, 2007, Orlando, Florida, USA, SPIE, Washington, D.C., doi: 10.1117/12.719116.

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Title Hyperstereopsis in helmet-mounted NVDs : slope perception
Author(s) Stuart, Geoffrey W.
Flanagan, Patrick
Gibbs, Peter
Conference name Society of Photo-optical Instrumentation Engineers (2007 : Orlando, Florida)
Conference location Orlando, Florida
Conference dates 10-11 April 2007
Title of proceedings SPIE 2007 : Head- and helmet-mounted displays XII : design and applications : 10-11 April, 2007, Orlando, Florida, USA
Editor(s) Brown, Randall W.
Publication date 2007
Series Proceedings of SPIE--the International Society for Optical Engineering ; v. 6557
Publisher SPIE
Place of publication Washington, D.C.
Keyword(s) night vision devices
slope perception
Summary Modern helmet-mounted night vision devices, such as the Thales TopOwl helmet, project imagery from intensifiers mounted on the sides of the helmet onto the helmet faceplate. This produces a situation of hyperstereopsis in which binocular disparities are magnified. This has the potential to distort the perception of slope in depth (an important cue to landing), because the slope cue provided by binocular disparity conflicts with veridical cues to slope, such as texture gradients and motion parallax. In the experiments, eight observers viewed sparse and dense textured surfaces tilted in depth under three viewing conditions: normal stereo hyper-stereo (4 times magnification), and hypostereo (1 / 4 magnification). The surfaces were either stationary, or rotated slowly around a central vertical axis. Stimuli were projected at 6 metres to minimise conflict between accommodation and convergence, and stereo viewing was provided by a Z-screen and passive polarised glasses. Observers matched perceived visual slope using a small tilt table set by hand. We found that slope estimates were distorted by hyperstereopsis, but to a much lesser degree than predicted by disparity magnification. The distortion was almost completely eliminated when motion parallax was present.
ISBN 9780819466792
Language eng
DOI 10.1117/12.719116
Field of Research 170112 Sensory Processes, Perception and Performance
HERDC Research category E2 Full written paper - non-refereed / Abstract reviewed
Copyright notice ©2007, SPIE
Persistent URL http://hdl.handle.net/10536/DRO/DU:30014848

Document type: Conference Paper
Collections: Faculty of Health
School of Psychology
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