Dynamic range, light scatter in the eye and perceived image quality

TitleDynamic range, light scatter in the eye and perceived image quality
Publication TypeChart
Year of Publication2015
AuthorsKane D, Bertalmío M
Image Source ProgramEuropean Conference on Visual Perception
Abstract

Light scatter in the eye can substantially reduce the dynamic range (DR) of the retinal signal. We quantify this effect by convolving high DR images with a point spread function that models eye scattering. We find that the resulting retinal DR can be described as the original DR raised to a power p. For images viewed in a dark background the exponent p is 0.68, while for image viewed with a dim background p is 0.45; this implies that a high DR image spanning seven orders of magnitude will span five in dark background conditions, but only three in dim background conditions. We also investigate the perceived quality of high DR images presented on an OLED monitor. We find that the highest quality is perceived when a dark background is used, but also note that the difference is most apparent when low key images are used. We investigate whether this effect can be explained by current image quality models.