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Old 11-13-2012, 06:39 AM   #20
Mister drool
Join Date: Dec 2011
Posts: 181

why by image and not by sound?

The thumb of a raquet hitting a serve is pretty loud, and if you put a phone (or something similar near the service box you are aiming, it could pick up the sound of when the ball hits the gound... from both noises it could calculate the amount of time the ball traveled the air up until it hit the ground. you type in the measurements of a tennis court, from the baseline to the service box, count the height of the net, and then do the part where im bad at - the maths.

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