Abstract
The purpose of this study was to determine the effects of horizontal resolution and shades of gray on target recognition. Phase I of the study determined target recognition time on a TV display when the subjects were permitted an external cockpit view of the targets on the terrain model. Phase II determined target recognition time and probability when the subjects were not permitted an external cockpit view of the terrain. A closed circuit television system was used in conjunction with a terrain model for static presentations to the subjects. The results from Phase I revealed reliable differences in target recognition time as a function of horizontal resolution; shades of gray; slant range; resolution and slant range interaction; shades of gray and slant range interaction; and resolution, shades of gray and slant range interactions. Phase II results showed reliable differences in target recognition time and probability as a function of resolution and slant range.
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