Computer Science

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Active Visual Search: Investigating human strategies and how they compare to computational models
(2024-03-16) Wu, Tiffany; Tsotsos, John K.
Real world visual search by fully active observers has not been sufficiently investigated. Whilst the visual search paradigm has been widely used, most studies use a 2D, passive observation task, where immobile subjects search through stimuli on a screen. Computational models have similarly been compared to human performance only to the degree of 2D image search. I conduct an active search experiment in a 3D environment, measuring eye and head movements of untethered subjects during search. Results show patterns forming strategies for search, such as repeated search paths within and across subjects. Learning trends were found, but only in target present trials. Foraging models encapsulate subject location-leaving actions, whilst robotics models captured viewpoint selection behaviours. Eye movement models were less applicable to 3D search. The richness of data collected from this experiment opens many avenues of exploration, and the possibility of modelling active visual search in a more human-informed manner.