Mobile Augmented Reality Augmented reality (AR) at first branched from virtual reality by overlaying a virtual computer image on top of the real-world image [1]. In its early days, augmented reality used head-mounted display (HMD) or hardware devices attached with various sensors. As mobile devices have evolved quickly in recent years, augmented reality has been adopted in the mobile environment. Unlike the previous generation of AR of which the focus was primarily rendering three-dimensional graphic objects on real-time videos, AR in the mobile environment seeks to provide enhanced user experience by combining location data from the sensors along with regional data retrieved from the Internet [8, 16]. Fig. 1 is a screenshot of a popular mobile AR service app, Layer. Users can retrieve information on shops, tourist attractions, movie theaters, etc. via this mobile AR service app.