Session No. 7 Pattern Recognition I General Papers 333 VISUAL DETECTION OF NOISY PATTERNS

Experiments are reported in which the quantum noise limitation of visual thresholds is explored further by the addition of noise to test patterns presented to the observers. The results show the characteristics predicted by a statistical theory of vision developed to account for the influence of the added noise, which was reported earlier. In particular, these measurements make it possible to calculate independent values for quantum efficiency and for Rose's factor of certainty. List of Symbols the area of summation of the eye the effective area of the stimulus (se