I believe today I did my best test (cage mostly green), but still not good enough.
The cameras are always off (some go below ground).

Should the cameras be at the same height?
Can it be tilted backwards or upwards?
The full circle must be perfectly alligned?

Here are the links
.iPiMocap - https://www.dropbox.com/s/45jpagl4orh3f ... 2.iPiMocap
.avi - https://www.dropbox.com/s/0wn1umfoswyqp ... export.avi
.xml - https://www.dropbox.com/s/1m3bppdusoz65 ... .scene.xml

It would be better to have the source iPiVideo file than exported AVI, so we can do the calibration process ourselves. Anyway, we could not open this AVI file. It seems to be corrupted :(

For sharing very big files it is convenient to use some P2P client. For example:
http://www.utorrent.com/help/guides/send-files

Do you mind using dropbox?
I've uploaded both of the files to it already.
.iPIMocap https://www.dropbox.com/s/dnbehchcvsndx ... 8.iPiMocap
IpiVIdeo https://www.dropbox.com/s/ya204jztqnb60 ... 8.iPiVideo

Absolutely not. Just mentioned another way of sharing FYI.


OK, got them.
Another bad thing about lights off is that other cameras are not visible, so it is not easy to figure aout how they are located. But through the motions of light I've managed to get that it's somewhat like a full circle in clockwise direction.
I've processed the video with "Auto detect initial camera positions" off and "Full circle clockwise" as initial cameras placement. Got quite good results as I can see that red leds visible in some cameras matched with positions of the opposite cameras. The results are very close to what you've got in your project after I have slightly adjusted the ground points to be the lowest marker positions in each of approaches to the floor, and set the scale in both projects to have Camera 1 height equal to 1.800m.
I've attached both project files in ZIP archive. Yours 2013-04-11_10-26-38.iPiMocap with corrected ground points, and the one I've processed myself 2013-04-11_10-26-38.new.iPiMocap.

I can say that the quality of video itself is sufficient for performing the calibration. So, what you consider wrong with your calibration results? Camera heights differ considerably from the measured values after scaling? Is it fixed by the more accurate selection of ground points?

Firtly, thank you very much for taking your time to see what I'm doing wrong and process the video.
But the problem remais, The camera 1 is about 20 cm off. It should be 2m above the ground. I try to scale the scnene, but to no good.
If the camera is tilted towards the ground, could it affect the process in any manner? Should it be parallel to the ground?

Anyway, unfortunetely, I got the same problems with the corrected ground points. Here is a video of my friend doing some moves. I can't aliign him in with the 3d actor in all views, which I believe has something to do with wrong calibration. I know that the process wasn't supposed to be that hard, I must be doing someting very basic wrong...

Btw, how did you improve the ground points? Since in my next recording section I'll have to reposition the cameras, I'd really like to learn to do it right.

Here is the link:
https://www.dropbox.com/s/ad39td3l2vypk ... o.iPiVideo

I strongly recommend you to put all the cameras at the same height

Sorry, I might confused something in your previous comments. I was sure that Camera #1 should be at 1.80m, and set the scene scale accordingly.
Can you put here the measured heights for all 6 cameras?

As I wrote, I just selected the lowest marker point at each spike (where you touch the floor) - that should be the most close to the real ground.

Yes, that was the case in the first tests, but since I'm using my college's studio, I have to reset all the cameras in every new section.
Right now, I can't send you the measures, because I had to take them off, since antoher student had to use the studio today.
Yes, wicq, I'm considering setting all of them at the same height... it is the only thing I haven't tried yet.

In the actor video I've posted above, you can check my studio set up. Is it too small, perhaps?

I use my bedroom which is 2.73 m x 3.76m with a little entrance of 60 cm that you add to the 2.73m side and it`s 1. 80m from the 3.76 m side. My capture area is 2.73m x 1.96m. Not the biggest area , but it`s very usable. I have 2 cameras in front of the area that are placed in the 2.73m side wall, 2 other cameras that are placed in the 60cm entrance and 2 other camera that are placed behind me, in one corner that it`s just one corner of the recording area. I dont have a 360 degrees area, my recording area starts in one side of the room(the opposite 2.73m wall) 5 cameras are at about 2.20 m height. the 6th one is placed at ground height, and even with this strange configuration , I could be able to calibrate the cameras and track performances. watch the first minute of this video so you can see an animation made with ipi studio(made with ipi studio 1 by the way, the head movement was made with abonyface, plugin for facial animation for 3ds max): http://www.youtube.com/watch?v=Z-jQPBVgV0c