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Comparison of three night vision intensification tube technologies on resolution acuity: results from grating and Hoffman ANV-126 tasks

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1117/12.602598
AuteurRechercher : 1; Rechercher : 2; Rechercher : 3; Rechercher : 4; Rechercher : 4; Rechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut de recherche aérospatiale du CNRC
  2. York University
  3. Topaz Technologies
  4. DND
FormatTexte, Article
ConférenceThe International Society for Optical Engineering (SPIE): Helmet-and Head-Mounted Displays X: Technologies and Applications, March 28-April 1, 2005, Orlando, FL USA
Sujetnight vision goggles; visual perception; resolution; visual acuity; grating
Résumé
Several methodologies have been used to determine resolution acuity through Night Vision Goggles. The present study compared NVG acuity estimates derived from the Hoffman ANV-126 and a standard psychophysical grating acuity task. For the grating acuity task, observers were required to discriminate between horizontal and vertical gratings according to a method of constant stimuli. Psychometric functions were generated from the performance data, and acuity thresholds were interpolated at a performance level of 70% correct. Acuity estimates were established at three different illumination levels (0.06-5X10⁻⁴ lux) for both procedures. These estimates were then converted to an equivalent Snellen value. The data indicate that grating acuity estimates were consistently better (i.e. lower scores) than acuity measures obtained from the Hoffman ANV-126. Furthermore significant differences in estimated acuity were observed using different tube technologies. In keeping with previous acuity investigations, although the Hoffman ANV-126 provides a rapid operational assessment of tube acuity, it is suggested that more rigorous psychophysical procedures such as the grating task described here be used to assess the real behavioural resolution of tube technologies.
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Publications évaluées par des pairsOui
Numéro du CNRCFRL-2005-0011
Numéro NPARC8928766
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Identificateur de l’enregistrement60be30eb-dc7b-40da-a268-8dc0122862ee
Enregistrement créé2009-04-23
Enregistrement modifié2020-04-16
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