Measure distances w 1mm precision

Hi all!

I'd like to measure the distance between two objects (one meter sized
thin edge and one centermeter sized roundish object). The objects are
normally about 0 to 20 mm away from each other. I could place a camera
two meters away. I would like to measure the distance with a precision
of 1 mm or so. Light conditions are okey, always same angle, b/w should
do fine.

Do you think it would be feasible to use digital image processing for
this purpose? What makes me uncertain is the precision. What kind of
camera would I need to measure 1 mm difference on 2 meters distance?
What precision would be reasonable?

Anyone with experiences or ideas is most welcome to comment!

.

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