Night Vision Performance in Detection and Identification of Moving Targets after Glare
Final rept. 1 Oct 1977-31 Jan 1979
OPTICAL SCIENCES GROUP INC SAN RAFAEL CA
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The purpose of this work is to evaluate night vision performance after photo-stress to allow development of optimum strategies for detection and resolution of moving targets under these environmental conditions. Contrast thresholds for detection and resolution were determined at scotopic light levels for static and moving targets of different sizes. The sensitivity for detection is highest for moving targets while the sensitivity for resolution is highest for static targets. Glare recovery measurements for detection and resolution were also performed at scotopic background levels for the same target parameters used in the thresholds measures without glare. Glare recovery is linearly related to target contrast for both resolution and detection over the range of contrasts used. The results indicate that performance on the glare recovery task cannot be predicted on the basis of contrast threshold alone. The results also show that one can predict glare recovery for either detection or resolution of different size targets, moving at different velocities on the basis of a single glare recovery measurement for a specific size and velocity using either detection or resolution as the criterion.