Print Email Facebook Twitter Human search with a limited field of view: Effects of scan speed, aperture size, and target conspicuity Title Human search with a limited field of view: Effects of scan speed, aperture size, and target conspicuity Author Hogervorst, M.A. Toet, A. Bijl, P. Publication year 2013 Abstract We investigate how human visual search performance with field of view (FOV) restrictions depends on scan speed, zoom factor, target location, and conspicuity. First, observers search a FOV that moves at a constant speed along a predefined path over a visual search scene (the field of regard, or FOR), and we measure the effects of scan speed, zoom factor, FOV size, target location, and conspicuity on search performance (detection time and probability). Then observers search either visual or thermal scenes by freely moving a joystick-controlled FOV over the FOR, while freely selecting the zoom factor in some conditions, and we measure the effects of the scan path characteristics and the use of different strategies on search performance. Search performance depends on the effective FOV size (the area where targets are expected to occur), but is largely independent of the display area. Both for visual and thermal imagery, various search performance measures correlate with target conspicuity. The results of both experiments suggest that observers can optimize their performance by adjusting their scanning behavior both to their visual limitations and to the expected target conspicuity. We present the outlines of a simple search model based on these current findings. Subject HumanPCS - Perceptual and Cognitive SystemsBSS - Behavioural and Societal SciencesDefence ResearchVisionDefence, Safety and SecurityTarget searchField of viewConscpicuityDetection probabilityField-of-viewSearch timeVisual search To reference this document use: http://resolver.tudelft.nl/uuid:6d5c5c06-a05b-4e99-ab07-202125d4a7da DOI https://doi.org/10.1117/1.oe.52.4.041106 TNO identifier 469883 Source Optical Engineering, 52 (4) Article number 041106 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.