From “Hands Off with Google Goggles“:
Basically, think of Goggles as object recognition, but with your phone’s camera serving as your eye. How might you identify an unfamiliar object? Perhaps by shape or by context. Does it have text printed on it? That’s also helpful. And it might also help if you had millions of photographs in your memory to compare objects to, as Goggles does.
How is this useful? Well, for shopping, perhaps. Identifying an object that isn’t properly labeled is certainly useful, especially if you’re overseas. There’s tourism, too: Goggles was smart enough to identify a painting in a demonstration, which linked, of course, to a variety of supplemental information. And some noteworthy objects can be found outside of a museum: the Transamerica Pyramid, for example, or the Golden Gate Bridge. Even home repair might be assisted by a computer-generated search for an otherwise unidentifiable widget.
Goggles can perform facial recognition, but it hasn’t yet found a business case that would justify it, according to a product demonstrator who didn’t identify himself. Although an obvious solution would be tagging, Google is still wrestling with how permissions would work and who would be allowed to tag photos, he said.
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