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Here is the situation, im practicing a bit using footage from http://www.hollywoodcamerawork.com/trackingplates.html

The problem is that even it has an error of 1.4 after solving the movement its okish however its facing in the other direction, as you can se the tracking its on the girls face but in the camera its like it was looking from behind, so the Z of the protection its in the other direction, is there a way to flip the result without duplicating cameras or a weird hack?

enter image description here

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2 Answers 2

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Try to get a Solve Error of 0.6 or lower

They don't provide any camera information and especially the Focal Length is missing, so you'll need trying out what works.

1. Find as much points as possible in the face to track

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2. Tracking Settings

Have a look in the Tracking Settings to figure out what works best. In this case the Fast Motion preset works really fine:

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You can also change the Tracking Speed in the Extra Settings to switch from Fastest to Realtime:

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This helps during the tracking process to see when a tracker looses the point.

3. Refine and Cleap up

I figuered out that refining leads to an incorrect lens distortion in this case. Also there is no need to refine K1 and K2.

Find Tracks with a high Average Error and remove bad tracks for a solid solution:

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At the end this should lead in a robust solution. I was able to get a Solve Error of 0.57 and all the tracker are well positioned in 3D space:

Result:

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Good read: How can I get better results when doing camera motion tracking?

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  • $\begingroup$ in your file, you are camera tracking the scene, i did that to get camera info from the survey shot, In this case im doing object tracking(not camera tracking) using the info of the camera that i get from the survey shot $\endgroup$
    – Nahuel Belich
    Commented Feb 17, 2016 at 16:57
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    $\begingroup$ It depends on what do you want to achieve, but in genral it doesnt matter wether the camera or the object moves. $\endgroup$
    – Dan
    Commented Feb 17, 2016 at 17:09
  • $\begingroup$ the objective was to practice basically object tracking, i did plenty camera tracking but never tried to track objects. $\endgroup$
    – Nahuel Belich
    Commented Feb 17, 2016 at 17:21
  • $\begingroup$ edited the answer. Again as you can see it doesn't matter. $\endgroup$
    – Dan
    Commented Feb 17, 2016 at 18:11
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    $\begingroup$ Add an object. Copy paste the trackers to it. $\endgroup$
    – Dan
    Commented Feb 17, 2016 at 21:57
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The answer for the camera inverted solver is to set the scale with -1 value of 2 trackers...enter image description here

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