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Old 03-20-2012, 05:00 PM   #31
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
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Default For stroke analysis 200 fps or more.

Quote:
Originally Posted by 5263 View Post
What would you consider a min frame rate for video?
200 fps or more is a good rate for stroke analysis. The shutter speed should be fast to minimize motion blur so that the racket and ball can be located better.

60 fps with fast shutter speed can be a very useful compromise to video both the whole match and some stroke mechanics. (60p progressive and not 60i interlaced.)

At 240 fps, internal shoulder rotation - a very fast motion of the serve that occurs over about 0.03 seconds - takes just 7 frames. With 60fps you do not get enough frames to understand this motion.

(If you want to calculate the motion between frames and motion blur -
http://www.kinovea.org/en/forum/viewtopic.php?id=435 Reply #1. Also has information on the Jello Effect.)

Last edited by Chas Tennis : 03-20-2012 at 05:07 PM.
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