Thread: Tennis Elbow
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Old 09-19-2013, 03:08 AM   #63
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
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Default High Speed Video vs Slowed Playback ?

Does 'ubersense' just slow down the playback by repeating frames or does it create false frames as some recent post-processing applications do?

You need to record high speed video at higher rates than 30 or 60 fps to properly see what is going on in the serve and other faster motions. If an application creates false frames in order to slow down the playback it would be misleading for analysis as to what is really happening.

This forward racket motion of the serve occurs over about 20 milliseconds.
https://vimeo.com/65434652

At 30 fps a video camera takes one frame every 33 milliseconds, at 60 fps every 17 milliseconds. 30 and 60 fps are not adequate frame rates to fully show the racket & arm motion as they move forward over just 20 milliseconds to hit the ball.

Last edited by Chas Tennis : 09-19-2013 at 03:10 AM.
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