Article: Location-based Mixed Reality for Mobile Information Services

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An assisted GPS application has been proposed that features orientation assistance provided by computer-vision techniques — detecting features included in the navigation route. These could be either user-predefined fiducials or a careful selection of real-world features (i.e. parts of buildings or whole buildings).

With the combination of position and orientation it is possible to design “augmented reality” interfaces, which offer a richer cognitive experience, and which deliver orientation information infinitely and without the limitations of maps. However, to complement the environment in an AR setup, the continuous calculation of position and orientation information in real time is necessary. The key problem for vision-based AR is the difficulty obtaining sufficiently accurate position and orientation information in real time, which is crucial for stable registration between the real and virtual objects.

This could be cool for rating or tagging locations, and being able to view that information by simply being in the proximity.