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Better 3D Camera Tracking?

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Callum MorrisonBetter 3D Camera Tracking?
by on Mar 21, 2016 at 11:16:32 pm

I am using the 3D camera tracker in AE on a shot where a lot of snow is present. As a result there is often some 'slipping' of the camera when I try to track it.

Is there a good way around this error in tracking? I am using 3D stroke for my effect, which uses the default AE camera - simple position tracking is not an option.

Would it be worth looking into Mocha?

Example shot:




With track points:





The slip is pretty minimal, but noticeable. Look at the top right light streak around 6 seconds in.

Any help is appreciated, thanks!


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Dave LaRondeRe: Better 3D Camera Tracking?
by on Mar 22, 2016 at 4:39:57 pm

You might Apply 3D tracker to a nested comp of the footage. In the nested comp you can play with levels & contrast to give yourself a better chance at a good track. Then apply the track to the original footage.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Callum MorrisonRe: Better 3D Camera Tracking?
by on Mar 22, 2016 at 10:29:22 pm

Ok,

To get an idea I assume I just want to make the footage as detailed as possible? Add sharpness and contrast to make edges more defined?

Cheers


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Dave LaRondeRe: Better 3D Camera Tracking?
by on Mar 22, 2016 at 11:23:02 pm

Right. Anything to give you a fighting chance at tracking featureless snow. It might work, and then again it might not.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Kalle KannistoRe: Better 3D Camera Tracking?
by on Mar 23, 2016 at 2:45:07 pm

Another possible approach is to smooth the results.

Apply the smooth expression to camera position and/or point of interest.


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Callum MorrisonRe: Better 3D Camera Tracking?
by on Mar 26, 2016 at 12:04:54 pm

Messing with the original video didn't seem to work; it gave track solving errors.

I've ended up messing about with the smooth expression and I feel that what I have now - 'smooth(1,11)' on position and 'smooth(0.5,1) on orientation works pretty well. I might tweak it a bit more but it certainly seems to be the solution! Cheers!


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