Helicopter Electro-Optical System Display Requirements. 1. The Effects of CRT Display Size, System Gamma Function, and Terrain Type on Pilots' Required Display Luminance
ARMY RESEARCH INST FOR THE BEHAVIORAL AND SOCIAL SCIENCES ALEXANDRIA VA
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Twenty-four Army helicopter pilots viewed videotaped segments of low- level and nap-of-the-earth NOE helicopter flights as presented on television monitors designed to simulate an airborne low-light-level television cockpit display system. While viewing these displays in an environment having no additional ambient illumination, these pilots were asked to set cockpit monitor luminance at the lowest level that they judged would permit successful flight control over the terrain being overflown. Each pilot adjusted luminance levels for eight different display conditions formed by the factorial combination of display size, type of terrain, and object-luminance to display-luminance transfer function system gamma function. Results show that pilots used lower luminance settings when viewing the larger of the two display sizes presented. They also used significantly lower luminance settings when viewing wooded terrain, with the system gamma function modified to provide enhanced contrast in the luminance range of interest, as against an unmodified system gamma function. The pilots subjective impressions agreed with their measured settings. This report discusses the impact of these results on the specifications of display requirements for a low-light-level television system for aiding night NOE flight.
- Anatomy and Physiology
- Human Factors Engineering and Man Machine Systems