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How to stabilize a DSLR material without getting a wooble vision?

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Manuel BauerHow to stabilize a DSLR material without getting a wooble vision?
by on Aug 26, 2012 at 2:30:33 pm

Hello,

I´m having a problem stabilizing some shots of a documentary that were recorded with a Canon 5d Mark II. The original images have already some wooble vision itself, I assume it is a problem with the rolling shutter. Here you can see an example of the raw material

http://vimeo.com/48204584

As you can see the handheld camera is quite shaky and when I try to stabilize them as a result the warpness gets worse (kind of LSD psychodelic effect). Here you can see the result

http://vimeo.com/48204585

I tried with the traditional motion tracking on After Effects, also parenting the shots to a null object and a camera and smoothing the analysis of the anchor points, and finally with the warp stabilizer of the CS 5.5. using the enhanced option in the rolling shutter menu, but the result is the same, the warp gets worse even though the shot is stabilized. Since it is a documentary the director doesn´t want the warpness within the stabilized images, and he really needs to use these shots.

If someone knows a way to reduce the rolling shutter wooble vision and then stabilize the shot without it looking weird, will be the best news I will receive lately.

Thanks

Manuel Bauer


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Tudor "Ted" JelescuRe: How to stabilize a DSLR material without getting a wooble vision?
by on Aug 26, 2012 at 5:30:38 pm

My approach (if I did not have CS6, where there's a quick way to fix rolling shutter) would be to try to eliminate that before trying to stabilize the footage.
Here's some good links:
http://blogs.creativecow.net/blog/4628/image-stabilization--rolling-shutter...

http://lesterbanks.com/2010/03/rolling-shutter-fix-in-after-effects-with-no...

http://filmmakeriq.com/2011/05/after-effects-tutorial-rolling-shutter-fix/

Tudor "Ted" Jelescu
Senior VFX Artist


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Jon BaggeRe: How to stabilize a DSLR material without getting a wooble vision?
by on Aug 29, 2012 at 8:43:03 pm

There are two problems here. One is rolling shutter which you can see in the original clip. As Ted suggested it might be worth trying to get rid of it first if Warp Stabilizer can't fix it.

The other problem is that camera moving around will introduce perspective changes. When you stabilize you remove the movement, but the perspective changes remain. This is the extreme weirdness you see in your stabilized clip. The warp stabilizer is meant to fix this using either subpixel warp or perspective warp.

However in my experience it doesn't always work that well. In your footage because you are moving close to a wall it makes it worse.

Two things I've used when I had similar problems:

- Turn the smoothness in Warp Stabilizer way down. Try 15% and see how it looks.

- Mask out the man character in the frame. As he's moving, you'll need to keyframe the mask. It can be very rough. Pre-compose, and Warp Stabilize the precomp. When the calculation is done, remove the mask.
The idea is not to confuse Warp Stabilizer with the moving character and hope it will focus on the back wall instead.

--------------
http://www.jonbagge.net
Jon Bagge - Editor - London, UK
Avid - FCP - After Effects


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Manuel BauerRe: How to stabilize a DSLR material without getting a wooble vision?
by on Sep 5, 2012 at 6:06:20 pm

Hello Jon
Thanks for your responde. I did what you said about masking out the character, first I filter the shot with the rolling shutter from the foundry, then mask it up and then apply the warp stabilization to it.
It looks better, I´m still getting some warpiness on it, but not as bad as it looked when I applied it to the whole shot. Seems I won´t be able to leave it as neat as I wish. Let´s see what the director thinks about it. I heard about a good rolling shutter reducer from VirtualDub, but it runs just over windows. Thanks for your help.
Regards

Manuel


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Manuel BauerRe: How to stabilize a DSLR material without getting a wooble vision?
by on Sep 5, 2012 at 5:55:59 pm

Thanks Ted for your help. I tried what you mentioned, eventhough the rolling shutter for the foundry works somehow, doesn´t corrected it quite well, or as well as I could wish. I tried the other way too, but as Jon said I have the characters to close to the wall and it makes things more difficult. Anyway, thanks for your tips.
Regards

Manuel


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