[parsec-users] Understanding Frames Orfder in Bodytrack

Christian Bienia cbienia at CS.Princeton.EDU
Tue Sep 9 13:26:56 EDT 2008


Hi Nikolay,

No, the frames are not independent! The body tracker uses the results from
the previous frame for its estimate for the subsequent frame.

If you run the video in reverse order you will get meaningful results
because a video played back in reverse order still is a coherent video, but
the results will be different.

- Chris


-----Original Message-----
From: parsec-users-bounces at lists.cs.princeton.edu
[mailto:parsec-users-bounces at lists.cs.princeton.edu] On Behalf Of Nikolay
Kurtov
Sent: Tuesday, September 09, 2008 5:03 AM
To: parsec-users at lists.cs.princeton.edu
Subject: [parsec-users] Understanding Frames Orfder in Bodytrack

Hello again,

there is a loop in Bodytrack that does all the job and looks like:

for(int i = 0; i < frames; i++)
     pf.Update((float)i);
     pf.Estimate(estimate);
     WritePose(outputFileAvg, estimate);
}

I tried run this cycle in the reverse order from frames-1 to 0.
The poses are similar but not the same.
Is this serial order important? Is it OK to use any other order?
Does Update() use any data from the previous step?

-- 
Regards,
Nikolay

mailto: nkurtov at gmail.com
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