Assisting iPi's tracking
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Author:  Michael Nikonov [ Wed Sep 02, 2009 3:43 pm ]
Post subject:  Re: Assisting iPi's tracking

In current version of our software, tools for manually fixing tracking errors are very limited.

It is possible to fix tracking errors related to a small number of problematic frames. For instance, actor may do some very fast arm motion and arm can be barely visible in 3-4 frames due to motion blur. In that case, you can manually adjust arm position in frames where motion blur is present, then continue completely automatic tracking from last problematic frame.

If you see tracking errors in large number of frames, it probably indicates a problem with calibration, or problem with background clutter, or incorrect world or actor scale. In that case, it is probably easier to re-shoot the motion then to try manually correcting the captured animation.

The system is not completely reliable and may have problems tracking some motions. To give you an idea on what motions can be tracked successfully, here is a link to a video gallery by Light Dog Films:


In upcoming versions of our software, we plan additional tools for manually correcting tracking errors.

To facilitate debugging, you can send me your video so that we can look at it and fix bugs or make suggestions on how to improve your capture. We can sign an NDA to make sure that your video will not be used for anything else but debugging purposes.

Author:  Greenlaw [ Wed Sep 02, 2009 4:23 pm ]
Post subject:  Re: Assisting iPi's tracking

Thanks for the information, Michael. I was wondering if I wasn't wasting my time trying to get supervised tracking to work, so I'm actually glad that I can stop obsessing over this now. But, of course now I'm eagerly looking forward to a future version of iPi Studio that does support supervised tracking. :)

By the way, I think the camera setup I used was not optimal for the small-ish space I was shooting in (my living room.) I believe two of my cameras were set too high up for this test, and I need to reconsider their placement. In an earlier test, I arranged them in a similar setup as in your tutorial video, and I think I need to go back to that setup. I'll see what happens with the new video, and send you a clip if I still have problems tracking it. (No NDA required; this is just personal R&D at this stage.)

After I work things out with my home sessions, I'll be getting a fourth camera and will shoot a session in a much larger space at work. I imagine I'll be able to do more complicated motions then.


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