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Proceedings Paper

Perception of terrain drop-offs as a function of L-R viewpoint separation in stereoscopic video
Author(s): John O. Merritt; V. Grayson CuQlock-Knopp; Mark Kregel; Jennifer Smoot; William Monaco
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Paper Abstract

Military missions often require drivers to maneuver across hazardous, off-road terrain using visual displays rather than direct vision. When soldiers use 2D displays, significantly more mobility errors occur than when soldiers use 3D displays that provide a stereoscopic view of the terrain. The purposes of the present experiment were to quantify the visual forewarning of a drop-off provided by a stereoscopic 3D display compared to a 2D display, and to measure the potential of increased camera separation (i.e., hyperstereo) for enhancing the benefit of 3D for the detection of terrain drop-offs. This experiment consisted of four viewing conditions: 0X (the 2D condition), 1X (stereo with the normal interpupillary distance [IPD] between the viewpoints provided to the two eyes), 2X (stereo with twice the normal IPD), and 3X (stereo with three times the normal IPD). Thirty-two participants viewed 80 video clips, each clip depicting an approach to a terrain drop-off as would be seen in a daytime driving situation. As soon as the drop-off became apparent, he or she pressed a brake pedal. As expected, the average detection time for drop-offs viewed with 1X (stereo display) was significantly better than when drop-offs were viewed with the 0X (2D) display. The failure to observe further improvements in task performance with 2X and 3X IPD suggests follow-on research to determine whether these unexpected hyperstereo results may be attributable to adverse side effects of hyperstereo: increased mismatch between accommodation and convergence, the minification effect, and increased stereoscopic “frame violation.”

Paper Details

Date Published: 19 May 2005
PDF: 8 pages
Proc. SPIE 5800, Helmet- and Head-Mounted Displays X: Technologies and Applications, (19 May 2005); doi: 10.1117/12.608151
Show Author Affiliations
John O. Merritt, The Merritt Group (United States)
V. Grayson CuQlock-Knopp, Army Research Lab. (United States)
Mark Kregel, KTS, Inc. (United States)
Jennifer Smoot, Army Research Lab. (United States)
William Monaco, Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 5800:
Helmet- and Head-Mounted Displays X: Technologies and Applications
Clarence E. Rash; Colin E. Reese, Editor(s)

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