This paper presents three computational visual distinctness measures, compu
ted from image representational models based on selective filtering, statis
tical features, and visual patterns, respectively. They are applied to quan
tify the visual distinctness of targets in complex natural scenes. The meas
ure that applies a simple decision rule to the distances between segregated
visual patterns is shown (1) to predict human observer performance in sear
ch and detection tasks on complex natural imagery, and (2) to correlate str
ongly with visual target distinctness estimated by human observers. (C) 200
0 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)03101-
9].