TARGET DETECTION USING BLACK-AND-WHITE TELEVISION. STUDY II: DEGRADED RESOLUTION AND TARGET-DETECTION PROBABILITY

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Abstract
The study used a black-and-white closed-circuit television (TV) system to investigate the effects of two levels of TV resolution (800 and 450 lines) on the probability that subjects would detect an M-48 tank. While a previous study used horizontal degradation only, this one degraded the TV image in both horizontal and vertical dimensions. The tank was shown in each of nine areas of the TV screen, under both levels of resolution. Thirty subjects observing the TV monitor were asked to indicate in which of the nine areas the tank appeared. With changes in the horizontal resolution only, in the previous study, changing resolution from 800 to 400 lines did not affect target-detection probabilities significantly. But with both horizontal and vertical changes, subjects performed significantly better at the 800 level of resolution than at the 450 level. The tank's location on the TV screen, although confounded with other variables, appeared to have an important effect on target-detection probability.

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