View Single Post
Old 10-03-2012, 04:24 AM   #9
Chas Tennis
Hall Of Fame
 
Join Date: Feb 2011
Location: Baltimore, MD
Posts: 3,258
Default

Quote:
Originally Posted by janm View Post
I thought I could measure racket head speed upto contact.
.................................................. ............
http://blog.tennisspeed.com/2011/05/...nd-part-1.html

I like these displays of racket head speed and orientation. With Kinovea you can go frame by frame and add the racket face lines manually. Lead tape on the edges would change the tilt after off-center impacts. How much?

Off center impacts causing racket face rotation -
http://www.youtube.com/user/misutaroboto/videos?view=0

A single camera cannot do 3D measurements. From a distance and for object motions parallel to the sensor plane it can measure X & Y pretty well. The component of the object's velocity that is toward or away from the camera, call it Z, cannot be measured. With some judgement you can often get some measurements and make the errors small.

Last edited by Chas Tennis : 10-03-2012 at 04:29 AM.
Chas Tennis is offline   Reply With Quote