SPEED OF IDENTIFICATION OF TELEVISED SYMBOLS AS A FUNCTION OF VERTICAL RESOLUTION.
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y
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An experiment was performed to determine the effect of vertical symbol resolution on speed of identification of televised letters and numbers. Subjects viewed 36 alphanumeric symbols, 10 times under 7 conditions of symbol resolution 5 to 11 scan lines, and under a solid-symbol nontelevised control condition. Performance showed a progressive improvement from 5 to 11 lines, but did not reach a level obtained with solid symbols. It was concluded that 11 lines approaches an optimal level of resolution, and that reduction in symbol resolution much below 11 lines should be approached with caution. Author