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Proceedings Paper

Latency meter: a device end-to-end latency of VE systems
Author(s): Dorian Miller; Gary Bishop
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Paper Abstract

The effectiveness of virtual environment systems depends critically on the end-to-end delay between the user's motion and the update of the display. When the user moves, the graphics system must update the images on the display to reflect the proper projection of the virtual world on their field of vision. Significant delay in this update is perceived as swimming of the virtual world; objects in the virtual wold appear to follow the user's motions. We are developing a standalone instrument that quickly estimates end-to-end latency without requiring electrical connections or changes to the VE software. We believe that a method for easily monitoring latency will change the way programmers and users work. Our latency meter works by observing the user's motion and the display's response using high-speed optical sensors. When the user rocks back and forth, the display exhibits a similar but delayed rocking of objects in the user's field of vision. We process the signals from the optical sensors to extract the times of very slow iamge change corresponding to the times when the user is nearly stopped (just before reversing direction). By correlating a sequence of these turn-around points in the two signals we can accurately estimate the end-to-end system delay.

Paper Details

Date Published: 23 May 2002
PDF: 7 pages
Proc. SPIE 4660, Stereoscopic Displays and Virtual Reality Systems IX, (23 May 2002); doi: 10.1117/12.468062
Show Author Affiliations
Dorian Miller, Univ. of North Carolina/Chapel Hill (United States)
Gary Bishop, Univ. of North Carolina/Chapel Hill (United States)

Published in SPIE Proceedings Vol. 4660:
Stereoscopic Displays and Virtual Reality Systems IX
Mark T. Bolas; Andrew J. Woods; John O. Merritt; Stephen A. Benton; Mark T. Bolas, Editor(s)

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