Short paper: User study for mobile mixed reality devices

In this paper we present a user study comparing four different mobile Augemented Reality (AR) interfaces. The focus of the study was on the usability of the devices, with respect to the unique nature of AR experiences, especially in the context of MR games, namely: the user usually needs at least one free hand; the interface might be used outside, the users will move around and they have to carry the equipment with them. The study found that Ultra Mobile PCs (UMPC) are preferred to Head Mounted Displays (HMD) and presents a number of concepts to the design of such systems