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Proceedings Paper

HMD distortion characterization and alignment toolset for precision-critical applications
Author(s): Mitchell Bauer; Logan Williams; Georges Nehmetallah; Alexander Van Atta; James Gaska; Marc Winterbottom; Steven Hadley
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Paper Abstract

Head-mounted displays (HMDs) generally exhibit significant image distortion, which must be reduced/eliminated prior to effective use. Additionally, biocular or binocular near-eye displays must be carefully aligned to enable overlapping two- or three-dimensional image synthesis without causing eye strain, fatigue, or performance loss. Typically, HMDs include distortion correction maps supplied by the manufacturer that are often generated by theoretical calculations that do not precisely match the as-built optical system or account for manufacturing variance. However, HMD users often assert that manufacturer-supplied distortion maps are not accurate enough for some alignment-critical applications. In this work we present the design and validation of a relatively low cost alignment and distortion characterization toolset (hardware and software) for characterization of biocular HMDs. This toolset is able to replicate the ocular alignment of most human observers by emulating a user’s ocular position to examine both on- and off-axis distortion and alignment over a wide range of viewing angles and eye positions. This enables accurate characterization of distortion changes experienced as a user’s eyes move to view different regions of the display (e.g., viewing off-boresight symbols in a well-aligned HMD or viewing a new alignment after an HMD has “slipped” to a slightly different position). The toolset characterizes distortion through image registration of distorted patterns displayed in the HMD to undistorted reference patterns. This work is intended to be of interest to HMD manufacturers, vision scientists, and operators of biocular HMDs for use in precision-critical applications.

Paper Details

Date Published: 5 May 2017
PDF: 19 pages
Proc. SPIE 10197, Degraded Environments: Sensing, Processing, and Display 2017, 101970S (5 May 2017); doi: 10.1117/12.2260089
Show Author Affiliations
Mitchell Bauer, USAF School of Aerospace Medicine (United States)
Logan Williams, USAF School of Aerospace Medicine (United States)
Georges Nehmetallah, The Catholic Univ. of America (United States)
Alexander Van Atta, USAF School of Aerospace Medicine (United States)
James Gaska, USAF School of Aerospace Medicine (United States)
Marc Winterbottom, USAF School of Aerospace Medicine (United States)
Steven Hadley, USAF School of Aerospace Medicine (United States)

Published in SPIE Proceedings Vol. 10197:
Degraded Environments: Sensing, Processing, and Display 2017
John (Jack) N. Sanders-Reed; Jarvis (Trey) J. Arthur III, Editor(s)

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