Zwanger V, Endres D, Giese M A, 2011, "Hooligan detection: The effects of spatial and temporal expert knowledge" Perception 40 ECVP Abstract Supplement, page 207
Hooligan detection: The effects of spatial and temporal expert knowledge
V Zwanger, D Endres, M A Giese
Surveillance of large crowds is an important task for ensuring the security of visitors at mass events, like soccer matches. In previous work we have shown significant differences exist between visual search strategies adopted by security experts and naive observers during the observation of such scenes (Endres et al, 2010 Perception 39 ECVP Supplement, 193]. When global (spatial and temporal) context was removed in a well-controlled psychophysical detection experiment for security-relevant events the looking strategies of experts and naive observers were quite similar. To test the influence of global context on fixation strategies under more natural conditions we investigated the eye movements of two experts and 20 naïve observers for characteristic phases taken from real soccer matches. The gaze patterns from both groups, watching for security-relevant events, were compared to saliency maps derived from low-level features [Bruce and Tsotsos, 2009 Journal of Vision 9(3):5]. We found significant differences between experts and naive participants, indicating that experts use specific scene-specific priors, which depend on the spatial layout of the arena and different temporal phases during the game. Furthermore, spatial expert priors became effective only after a few seconds of watching a scene, while initial looking behavior was driven by low-level saliency.
[Supported by EU projects FP7-ICT-215866 SEARISE, TANGO and the DFG]
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