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My understanding is it uses 2 cameras which are aimed perpendicular to each other and feeding data into a computer which tracks the ball via shape recognition software and records the 3 deminsional path (actually an approximated path derived from 20 or so points).
It is also my understanding that the inner and outer edges of the strike zone are fixed to the edges of the plate but the upper and lower extremities are adjusted for each batter according the the size of the batter. No adjustments are made regarding the batters position relative to standing in the front of the box vs. the back of the box.
It is also my understanding that the "digital strike zone" is a plane at the front of the plate rather than a theioretically correct pentagonal prism.
All this is based upon what I have read and not based on first-hand knowledge.
The bottom line is , in my opinion, this has forced umpire to call a more consistant, rule-correct strike zone and we don't have any Eric Greggs (RIP) with a 3 foot wide strike zone.
My 12 year old son commented Sunday night during the Reds/Giants game how good the HP umpire was at balls/strikes.
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