Abstract
A prediction of human visual target detection performance is important for many military and civilian applications. A previous paper by the authors in this journal develops an extensive numerical hyperbolic curve fitting routine for the Blackwell-McCready (BM) laboratory contrast threshold data set. The BM data set is extended to real world scenes by developing a new operational definition of ambient luminance. The pro- cess involves an empirically derived formula for computing the diurnal ambient luminance as a function of solar position, time of day and ob- server location on the earth. An analytical methodology predicts prob- ability of detection Pd for various target areas, contrast levels and back- ground ambient luminance. A subsequent analysis shows that Pd is a very sensitive function of target parameters during the twilight region before dawn and after dusk. Several numerical examples illustrate the utility of this formalism to various target detection applications involving aided and unaided optics. © 1998 Society of Photo-Optical Instrumentation Engi- neers. (S0091-3286(98)01607-9)
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