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Experimental studies of the use of phase lead filters to compensate lags in head-coupled visual displays

Experimental studies of the use of phase lead filters to compensate lags in head-coupled visual displays
Experimental studies of the use of phase lead filters to compensate lags in head-coupled visual displays

Display lags degrade performance when using the head to track a target presented on a helmet-mounted display. These lags originate from delays in measuring the position of the head and the time required to generate the image of the target. This paper presents two laboratory studies on the use of phase lead filters to improve head tracking performance in the presence of display lags. In the preliminary study, the benefits of lag compensation by a phase lead filter were impeded by associated changes in filter gain. The frequency responses of two phase lead filters were then optimized to have near unity gain at frequencies below 0.7 Hz where there was most head motion. The main study showed that these optimized filters significantly improved head tracking performance with a system having a total lag of 140 ms. At frequencies above about 0.7 Hz, a greater than unity filter gain caused jittery image movement. Although this jittering degraded head tracking performance it was removed by an alternative lag compensation technique involving 'image deflection'. This deflection shifted the displayed image to its correct horizontal and vertical position relative to the head. Image deflection, combined with the phase lead filters, produced a tracking performance unaffected by lag.

1083-4427
445-454
So, Richard H.Y.
c0504602-a431-4e04-99b3-c5224ad51722
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
So, Richard H.Y.
c0504602-a431-4e04-99b3-c5224ad51722
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

So, Richard H.Y. and Griffin, Michael J. (1996) Experimental studies of the use of phase lead filters to compensate lags in head-coupled visual displays. IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans, 26 (4), 445-454. (doi:10.1109/3468.508823).

Record type: Article

Abstract

Display lags degrade performance when using the head to track a target presented on a helmet-mounted display. These lags originate from delays in measuring the position of the head and the time required to generate the image of the target. This paper presents two laboratory studies on the use of phase lead filters to improve head tracking performance in the presence of display lags. In the preliminary study, the benefits of lag compensation by a phase lead filter were impeded by associated changes in filter gain. The frequency responses of two phase lead filters were then optimized to have near unity gain at frequencies below 0.7 Hz where there was most head motion. The main study showed that these optimized filters significantly improved head tracking performance with a system having a total lag of 140 ms. At frequencies above about 0.7 Hz, a greater than unity filter gain caused jittery image movement. Although this jittering degraded head tracking performance it was removed by an alternative lag compensation technique involving 'image deflection'. This deflection shifted the displayed image to its correct horizontal and vertical position relative to the head. Image deflection, combined with the phase lead filters, produced a tracking performance unaffected by lag.

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Published date: 1 July 1996

Identifiers

Local EPrints ID: 429452
URI: https://eprints.soton.ac.uk/id/eprint/429452
ISSN: 1083-4427
PURE UUID: a94ab2ae-b5ba-4dbd-9006-67d78197d2e0
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 27 Mar 2019 17:30
Last modified: 05 Nov 2019 02:08

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