Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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I've done it with openCV, it works nicely. BUT, I cannot stress this enough, do not buy crappy cameras. Get legit machine vision cameras.
[...] But I need it to have as much precision as possible(0.03% error) (translates to roughly 3000 pixels lengthwise)