APS Excellence in Physics Education Award
November 2019

Education Prize Logo
Science SPORE Prize
November 2011

NSF Logo
The Open Source Physics Project is supported by NSF DUE-0442581.

Autotrack points for multiple evaluations post and replies

Return to the Autotrack points for multiple evaluations thread
Login to post to this thread

Autotrack points for multiple evaluations - April 1 at 4:58:AM
Jo Mayer
8 Posts

Is there any possibility to use the same Auto-Track Points for multiple Evaluations like Perpective filter, mass points and calibration stick? Thanks for any advice.


I am using Tracker 5.1.5


Replies to Autotrack points for multiple evaluations

Re: Autotrack points for multiple evaluations - April 01 9:11:AM
Jens Biele
5 Posts

good point!
I have no idea. Trying to figure it out myself..



Re: Autotrack points for multiple evaluations - April 01 12:10:PM
Douglas Brown Avatar
Douglas Brown
310 Posts

Can you give us more information and context? Do you have an example case you can describe? I'm not sure I understand what you mean.


> Re: Autotrack points for multiple evaluations
>
> Is there any possibility to use the same Auto-Track
> Points for multiple Evaluations like Perpective filter,
> mass points and calibration stick? Thanks for any advice
>
>
>
> I am using Tracker 5.1.5



Re: Autotrack points for multiple evaluations - April 02 2:09:AM
Jo Mayer
8 Posts

Sure, I have this plate mounted on a vehicle I want to track. Now I want to track these 4 marker points as point masses and apply a perspective filter to them. To do this, I would have to carry out autotrack for the filter as well as for the 4 marker points. My question is if I can track this 4 points with autotrack and decide afterwards wich evaluation I want to on them, like Point Mass, perpective filter, calibration Stick,...

Attached File: Kalibrierrahmen.png



Re: Autotrack points for multiple evaluations - April 02 9:03:PM
Douglas Brown Avatar
Douglas Brown
310 Posts

Hi Jo, unfortunately the short answer is no, at least for the perspective filter. However, if you track the marker points as 4 point masses, then you can attach the ends of a calibration stick to any pair of them so that's a partial yes ;-)

It's a slightly unusual request because normally if a video needs perspective correction then you have to apply that BEFORE you track any point masses.

Doug


> I have this plate mounted on a vehicle I want
> to track. Now I want to track these 4 marker points
> as point masses and apply a perspective filter to
> them. To do this, I would have to carry out autotrack
> for the filter as well as for the 4 marker points.
> My question is if I can track this 4 points with autotrack
> and decide afterwards which evaluation I want to on
> them, like Point Mass, perspective filter, calibration
> Stick,...



OSP Projects:
Open Source Physics - EJS Modeling
Tracker
Physlet Physics
Physlet Quantum Physics
STP Book