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...They would rather require larger resolutions and so much larger capacities - How to use them? ...
Modern smartphones have optical autofocus and flash. The lens is very small so the depth of field is relatively large - I don't think it is a problem to get a really sharp picture of a flat surface(?)
Eventual errors, deformations, should be correctable by built in error correction, which is rather required.
You are saying that they cannot be very small and I completely agree with that - here is an article suggesting to use at least 0.4mm per data dot.