Effect of Contrast on Target Detection in PBB (Passive Broadband) Displays

摘要

If the number of luminance levels in the PBB display is increased, target detectability is enhanced. One possible explanation of this enhancement is that the target's contrast ratio is increased as the number of luminance levels in the display is increased. In order to test this directly, the number of luminance levels in a PBB display was held constant and the target's contrast ratio was increased by increasing the range of the luminance levels. Under these conditions, there was no enhancement of target detectability, i.e., observers performed equally well on high and low contrast displays. Thus, the improvement in performance obtained when the number of luminance levels is increased must be attributed to other perceptual factors. (Author)