Abstract

This paper is concerned with the description and analysis of a series of automobile headlighting experiments, the primary objective of which, was the detection of dark obstacle targets simulating hazardous objects encountered during night driving. The influences of atmospheric luminance, dynamic vehicle pitch, target shadow enhancement, as well as observer characteristics relating to fixation duration and glare sensitivity are included in the analysis of field detection trials. Several different measures of target visibility have been employed. It is shown that a centroidal value of target luminance difference can be used as an index of the detection of hazard-like objects.

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