View Full Version : Motion Analysis at night - CLARIFICATION

01-30-2009, 02:43 AM
Thank you for the responses received already. Some clarification:
* We already have a good motion capture system (Motion Analysis Corp)
that we use successfully in our lab, as well as our own software for
analyzing throwing. Thus, we are not looking for different technology
* We want to compare the biomechanics of throwing various distances (for
example, 20m, 50m, 75m). Thus, we can stage a small testing area for
the thrower, but need a large area for the ball to travel. (We are not
interested in tracking the ball's flight.)
* We will use the infrared ringlights from the motion analysis system
for data collection. The stadium lights are for the athletes throwing,
athletes catching, and the biomechanist to see what they are doing.

-----Original Message-----
From: * Biomechanics and Movement Science listserver
[mailto:BIOMCH-L@NIC.SURFNET.NL] On Behalf Of Glenn Fleisig
Sent: Friday, January 30, 2009 8:25 AM
Subject: [BIOMCH-L] Motion Analysis at night

We want to capture automatic motion data on a real sports field or
court, but want to avoid the problem of infrared light from the sun. So
I'm thinking of something like this:

1. Reserve some outdoor ball field or court that has lights for
night games

2. Set up motion analysis cameras on tripods around a "test area"

3. When the sun sets, turn the stadium lights on

4. Attach reflective markers on each subject and test them.

Is this a crazy idea, or good idea? Does anyone have any experience or
insight about collecting motion data with reflective markers at night,
under artificial lighting?

Thank you, in advance. I will post a compilation of any responses I

- Glenn S. Fleisig, Ph.D.

Glenn S. Fleisig, Ph.D., Director of Research
American Sports Medicine Institute
833 St. Vincent's Drive, Suite 100
Birmingham, AL 35205
(email) glennf@asmi.org
(tel) 205-918-2139