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Yep, I'm sure he isn't. I don't doubt that you could optimize this algorithm to run on a phone but that takes an insane amount of effort and expertise and is a feat in and of itself. The word lens guys, for example, spent about a year porting from an optimized C implementation on i386 to ARM for the iPhone - they even initially used the GPU but decided that the overhead of shuffling data between buffers wasn't worth the advantage gained by the iPhone's measly GPU (which only had 2 fragment shaders at the time I think).

Also, completely agree on how camera blur would worsen the accuracy of said algorithm, I was trying to point out that it would run faster on a lower quality camera (with the caveat that it might not work nearly as well).

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