Image Interpreter Screening Performance as Affected by Resolution, Presentation Rate, and Scale
Technical paper Jul 1968-Jun 1969
SYSTEM DEVELOPMENT CORP MCLEAN VA
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This study measured performance levels of image interpreters, using both direct viewing and viewing with magnification, to screen 70mm photographic imagery moving at six different rates and varying in scale and resolution. The resolution of the imagery was varied to simulate imagery obtained with different transmission bandwidths. The results were as follows. 1 There is little loss in screening accuracy at any level of resolution andor magnification for frame presentation rates of 6.0 to 1.5 secframe with the 12,000 scale imagery and 6. 0 to 2.0 secframe for the 14,000 scale imagery. 2 In general, the poorer the image resolution, the lower the screening accuracy. 3 For constant display format and image resolution, screening accuracy is significantly greater for the larger scale display. 4 Two-power optical magnification of the photographic imagery resulted in a decrease in screening accuracy. Increasing viewing time for magnified imagery by a factor of four so that the incremental area viewed per second was equated for direct and magnified viewing resulted in no significant difference between the two viewing conditions. Tradeoffs are possible between and among the factors of scale, presentation rate, and resolution.
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