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"in a store through a phone's camera."

If it was for the store then you'd do one or more stationary mounts of something better and more purpose-built than a camera phone. Or something even simpler like counting bodies in and out at the door with the door dinger thing.

So I assume it's for surveilling the store surreptitiously, right?

I suppose it's an interesting problem for the machine vision people. But how do you deal with people down the aisles that you can't see? How do you avoid looking like you're collecting upskirts or kiddie porn? How do you avoid just plain getting your face punched in?

Is there a way to count cell phone signals, from your own phone or from special equipment? There were stories a year or so ago about some mall that was going to track individual phones through the mall, to discern shopping patterns and such. I imagine it's not impossible to create something that you could use surreptitiously (again, I'm assuming).



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