Hyperstereopsis in helmet-mounted NVDs: absolute distance perception

Patrick Flanagan; Geoffrey W. Stuart; Peter Gibbs

doi:10.1117/12.729603

2 May 2007 Hyperstereopsis in helmet-mounted NVDs: absolute distance perception

Patrick Flanagan, Geoffrey W. Stuart, Peter Gibbs

Proceedings Volume 6557, Head- and Helmet-Mounted Displays XII: Design and Applications; 65570J (2007) https://doi.org/10.1117/12.729603
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 side of the helmet onto the helmet faceplate. The increased separation of the cameras induces hyperstereopsis - the exaggeration of the stereoscopic disparities that support the perception of relative depth around the point of fixation. Increased camera separation may also affect absolute depth perception, because it increases the amount of vergence (crossing) of the eyes required for binocular fusion, and because the differential perspective from the viewpoints of the two eyes is increased. The effect of hyperstereopsis on the perception of absolute distance was investigated using a large-scale stereoscopic display system. A fronto-parallel textured surface was projected at a distance of 6 metres. Three stereoscopic viewing conditions were simulated - hyperstereopsis (four times magnification), normal stereopsis, and hypostereopsis (one quarter magnification). The apparent distance of the surface was measured relative to a grid placed in a virtual "leaf room" that provided rich monocular cues, such as texture gradients and linear perspective, to absolute distance as well as veridical sterescopic disparity cues. The different stereoscopic viewing conditions had no differential effect on the apparent distance of the textured surface at this viewing distance.

Citation Download Citation

Patrick Flanagan, Geoffrey W. Stuart, and Peter Gibbs "Hyperstereopsis in helmet-mounted NVDs: absolute distance perception", Proc. SPIE 6557, Head- and Helmet-Mounted Displays XII: Design and Applications, 65570J (2 May 2007); https://doi.org/10.1117/12.729603

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available