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Love the idea for the professional.

Is there any way to measure less precisely using the iPhone's camera? Something about using the gyroscope to get a depth measurement?

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More likely you'd use algorithms based on structure from motion, like in the Kinect. But that's definitely not the target market for these guys.

ya of course. Do you have more details? I'm interested myself.

No, but you should be able to find academic papers in standard databases like EBSCOhost (most major public libraries I've seen have a subscription that you can access by just getting a library card with proof of residency).

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