ASSESSMENT OF DEFOCUSED WORDS AND PHYSICAL CORRELATIONS

The investigation deals with the correlation between the perceived edg e definition of defocused photographs and the corresponding physical p arameters associated with defocus. The maximum photographic profile sl ope was found to be a significant parameter. The sensitivity to defocu s for a group of observers was obtained. We fit a suprathreshold senso rial compression equation to the experimental data. This curve describ es the compression behavior of the biological mechanism involved in th e interaction between physical stimuli and visual sensation. It can be shown as a region surrounded by two regions with low sensitivity.