Workshopbeitrag
Stereoscopic Depth and Object Size Effects on Fixations and Subjective Saliency in Autostereoscopic Displays
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2024
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Gesellschaft für Informatik e.V.
Zusammenfassung
For the purpose of effectively directing visual attention in monitoring or teleoperation tasks, such as highly visualized control rooms or assistance systems in vehicles, it is crucial to understand which attributes contribute to salient perception, since the use of attention-directing designs can ultimately affect response times. To date, research literature (e.g., on displays) and norms have focused on directing attention through 2D attributes such as color. With the increasing relevance of three-dimensional environments (VR, AR, 3D displays), this paper investigates stereoscopic depth and object size as saliency-guiding attributes to direct attention. To control for the effects of the perspective, object size is divided into the viewing angle and the actual size. To estimate which variations of depth and object size attract more attention in a pairwise comparison we conducted a within-subjects design with subjective saliency selection. The study involved N = 15 participants using an autostereoscopic 3D display. Measurements included recordings of the initial fixation with eye-tracking, the selection of the subjectively more salient item, and the reaction time. The results show that both the visual angle and the stereoscopic depth have independent effects on subjective saliency perception. In addition the effect of visual angle is stronger when the item is farther away. A clear distinction between object size and visual angle is therefore suggested for future studies.