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What units is the 'distance' measured in? (in the matches of a SURF)

I have been looking at feature detection and matching using the SURF and BFMatcher methods. In order to draw these matches, the maximum and minimum distances are calculated to help find 'good matches'

My question is, what unit is the distance calculated in? (cm, mm, inches).

This distance is the distance between two matched points. Is my understanding correct?

Thank you.