Hyperstereopsis in helmet-mounted NVDs: slope perception

Geoffrey W. Stuart; Patrick Flanagan; Peter Gibbs

doi:10.1117/12.719116

1 May 2007 Hyperstereopsis in helmet-mounted NVDs: slope perception

Geoffrey W. Stuart, Patrick Flanagan, Peter Gibbs

Proceedings Volume 6557, Head- and Helmet-Mounted Displays XII: Design and Applications; 65570K (2007) https://doi.org/10.1117/12.719116
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

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.

Citation Download Citation

Geoffrey W. Stuart, Patrick Flanagan, and Peter Gibbs "Hyperstereopsis in helmet-mounted NVDs: slope perception", Proc. SPIE 6557, Head- and Helmet-Mounted Displays XII: Design and Applications, 65570K (1 May 2007); https://doi.org/10.1117/12.719116

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