Excerpt from an augmented reality snapshot
Computer vision describes a device’s ability to see, meaning it can recognize an object, extract information from that object and do something with that information.
AR apps that rely mostly on GPS do more guesswork than object recognition. Google Goggles, for example, takes advantage of GPS for local search when someone uses an Android phone to pan around and see points of interest identified on the screen, like businesses. An app called Layar uses GPS and helps people with things like finding the closest drugstore or getting extra points in a game by walking to a certain place.