Calibration not occuring in short clips

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David Menard

Nov 30, 2012, 11:28:14 AM11/30/12
I have a series of very short recordings that I want to use to precisely measure the accuracy of 1-2-3 Kinect devices with OpenNI (the recordings are done simultaneously with a FlockOfBirds system).
When recording, I noticed that the subject had to move forward and back before the calibration happens. I then started recording the clip when the calibration was done. 

The problem is that whenever I play back, the user is not recognized and a calibration never occurs! Is there a way to force the calibartion to occur? I'm guessing that the user needs to move so that OpenNI can guess its depth, but since I know the depth of the user, maybe I could manually feed this info to the calibration process?

Thanks for your help! 

David Menard

Nov 30, 2012, 11:31:53 AM11/30/12
I wasn't able to attach sample clips in my post, I get a "An error (#340) occurred while communicating with the server."  so please email me if you want a few sample clips!


Dec 5, 2012, 2:33:07 AM12/5/12

the problem you mentioned, that people had to move back and forth to calibrate is already the key point of your problem.
This is due to the fact that to be able to recognize people in a scene, openNI needs some initial movement of the subjects.
As soon as point clouds are classified as persons, the calibration can start.

since you only started the recording AFTER the people were recognized, (I assume) they don't move, so are not recognized...
if you had started recording from the beginning, this would have worked from the recorded files the same way as from the live video feed.

i'm sorry i have no idea of how to help you with your problem except that you need to recapture those videos...

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