Quantification of Interference and Detectability Properties of Visual Stimuli for Optimal Display Design.
Annual scientific rept. 1 Apr 82-31 Mar 83,
HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES
Pagination or Media Count:
The authors objective is the quantitative characterization of visual spatio-temporal chaneling of information. The immediate approach of this study is to measure the detectability of a visual test stimulus which is a moving sinusoidalgrating pattern, in the presence of a masking visual stimulus, which can be represented in spatio-temporal frequency space as band-limited two-dimensional dynamic visual noise. He has performed coherent masking studies in which the mask is a high-contrast traveling wave grating and have discovered that the masking function is very asymmetrical in spatial frequency when the mask and test gratings are matched in velocity. It was also discovered that band limited two-dimensional visual noise can be simulated by discrete punctate spectral components lying within the desired band and that as few as six components can give a representation indistinguishable from continuous-spectrum noise. To perform these band-limited visual noise studies the author created a unique computer-controlled system for image generation.