phantom markers
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- Posts: 6
- Joined: Thu May 27, 2010 1:13 pm
phantom markers
Hello,
I am a new user of tracking tools software. I work about walk analysis and I have some problem with phantom markers that display. Doest it exist a part for post-treatment and remove these phantom markers ? If no, is it planned to develop this in the next update ?
Thanks
Yoann
I am a new user of tracking tools software. I work about walk analysis and I have some problem with phantom markers that display. Doest it exist a part for post-treatment and remove these phantom markers ? If no, is it planned to develop this in the next update ?
Thanks
Yoann
Re: phantom markers
What type of phantom markers are you getting?
Have you tried recalibrating the software?
Can you determine where the extra markers are coming from?
Have you tried recalibrating the software?
Can you determine where the extra markers are coming from?
Re: phantom markers
Phantom markers can be caused by several things, reflections in the room, software settings, or calibration.
Are the markers appearing next to real markers, like they are splitting, or are they just random in a scene?
I would first check your calibration, look at the residual value, make sure it is less than 1mm or so.
Also try turning on display of "rays" and "untracked rays", it can help determine if there are particular cameras which might be poorly calibrated.
You can strip these out when you export the data, if you are not exporting all unlabeled markers.
Are the markers appearing next to real markers, like they are splitting, or are they just random in a scene?
I would first check your calibration, look at the residual value, make sure it is less than 1mm or so.
Also try turning on display of "rays" and "untracked rays", it can help determine if there are particular cameras which might be poorly calibrated.
You can strip these out when you export the data, if you are not exporting all unlabeled markers.
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- Posts: 6
- Joined: Thu May 27, 2010 1:13 pm
Re: phantom markers
The phantom markers are appearing next to real markers, like they are splitting. I watch the rays and it's often the 2 further cameras that don't find the same markers coordinate that the others cameras.
I calibrated several times and I have always the same problems in spite of low values of std errors 2D and mean errors 2D.
Yoann
I calibrated several times and I have always the same problems in spite of low values of std errors 2D and mean errors 2D.
Yoann
Re: phantom markers
What version of the Tracking Tools software are you using?
How do you have the cameras arranged, for the setup area?
How do you have the cameras arranged, for the setup area?
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- Posts: 6
- Joined: Thu May 27, 2010 1:13 pm
Re: phantom markers
I have the version 2.2 beta 1.
The camera were placed on a square of 20 feet around the walkway, almost like showed on the optitrack site : http://www.naturalpoint.com/optitrack/i ... 2truss.jpg.
Two cameras are in each corner and the last four cameras are on the sides of the walkway. Every cameras see the center of walkway the force plates are placed.
The camera were placed on a square of 20 feet around the walkway, almost like showed on the optitrack site : http://www.naturalpoint.com/optitrack/i ... 2truss.jpg.
Two cameras are in each corner and the last four cameras are on the sides of the walkway. Every cameras see the center of walkway the force plates are placed.
Re: phantom markers
Can you send in copies, of your calibration, capture, rigid bodies, etc. to support.
Re: phantom markers
Interesting. We've had lots of problems with phantom markers too, usually a third phantom appearing between the two foot markers. We'll see if the new wand sorts that problem out.
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- Posts: 6
- Joined: Thu May 27, 2010 1:13 pm
Re: phantom markers
I haven't the new wand so could you say me if the problem disappear with him ?
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- Posts: 10
- Joined: Fri Sep 14, 2007 7:33 am
- Location: Uppsala, Sweden
Re: phantom markers
Try using a carpet if you're on a hardwood or plastic floor. Reflections from other cameras' lights can be reflected by the floor and cause strange reflections by the feet.
Kahl
Kahl