Research Proposal Augmented Reality Visualization of Outdoor Environmental Corrosion
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- Applications of AR
Classification of ARThe methods used in the implementation of AR can be separated into three areas; head-mounted display (HMD), handheld and projection based AR (Zhou et al., 2008, Azuma et al., 2001). Jun (1995) describes a method of AR system where the world is augmented when looking through a specific device’s view port onto the world. Handheld AR systems apply this ‘magic glass’ technique, acting as a window to the augmented world. Unlike handheld AR, where users only experience AR in the limited areas that involve the magic lens’ viewport, mobile AR is fully immersive, with users wearing a head mounted display, or similar device to interact with the augmented world (Milgram et al., 1995). Applications of ARMany areas have been identified as being able to benefit from AR (Azuma, 1997). Given the nature of mobile AR’s ability to allow a user’s movement over large geographical areas, one application is the use of AR in large scale, outdoor navigation. Previous work has been carried out to examine the effectiveness and technological considerations of outdoor AR navigation (Feiner et al., 1997, Thomas et al., 1998, Gerhard et al., 2004). The Touring Machine (Feiner et al., 1997) provided point of interest guidance for exploration of outdoor environments. By augmenting the user’s view with labelling for buildings and important structures, the system served as a virtual tour guide for those unfamiliar with the environment. Similarly, the Tinmith mobile AR system (Piekarski and Thomas, 2003), originally developed for outdoor architectural design, could be used as a virtual compass (Thomas et al., 1998). By using a floating diamond to indicate the destination’s direction and distance, the system could guide users to their destination. There have been a number of extensions to Tinmith; including a ‘first person shooter’ game, ARQuake (Thomas et al., 2000), an outdoor weather simulator, ARWeather (Heinrich et al., 2008), x-ray vision (Piekarski, 2009) and terrain visualization for viticulture, ARVino (Piekarski et al., 2005). ARVino supported the visualization of geographical information system (GIS) data in mobile AR, enabling users to view geographic areas through the HMD, with additional information inferred from the overlaid colour scheme on top of the terrain (Figure 2). 
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