No abstract

Today, head-up displays (HUDs) are commonly used in cars to show basic driving information in the visual field of the viewer. This allows information to be perceived in a quick and easy to understand manner. With advances in technology, HUDs will allow richer information to be conveyed to the driver by exploiting the third dimension. We envision a stereoscopic HUD for displaying content in 3D space. This requires an understanding of how parallaxes impact the user's performance and comfort, which is the focus of this work. In two user studies, involving 49 participants, we (a) gather insights into how projection distances and stereoscopic visualizations influence the comfort zone and (b) the depth judgment of the user. The results show that with larger projection distances both the comfort zone and the minimum comfortable viewing distance increase. Higher distances between the viewer and a real world object to be judged decrease the judgment accuracy.

Abstract. Mobile devices have conquered our daily life. They are carried and used at almost all times and in any situation sometimes even against legal restriction -e.g. in the car. Services running on these devices (e.g. email, text messages, etc.) include graphical (GUI) and voice interface (VUI) causing visual distraction for the driver although they could solely be operated by speech in-and output. As a result services should adapt their interfaces due to the specific usage scenario. The aim of this work is therefore to develop design recommendations based on a cognitive model for the voice user interface taking the particularities of the specific scenario (e.g. reduction of off-road eye gazes) into account. We assume that distraction is mainly due to an increased effort and a decreased expectancy of the VUI compared to the GUI. Design recommendations derived from these considerations will be described by means of a concrete example.