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Why do you need absolute positions? Just see if the finger tapping the table is extended up/forward relative to other finger(s).

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how would the computer know which key your finger was on to figure out what keys are relative to that finger?

You could assume that the non-thumb fingers of a hand span at most two rows and that one of these is the "home" row.

When you detect a tap visually, you could then infer which row that finger tapped by looking at where the other non-thumb fingers are.

i dont understand , are we still talking about a qwerty keyboard? or a special kind with just two rows, one of which is a "home" row that is placed wherever certain fingers are?

This would work with three rows, with the home row being the middle one.

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