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Remove a static background using the differences in the shot

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Florian Schneider
Remove a static background using the differences in the shot
on Nov 9, 2018 at 10:06:26 pm
Last Edited By Florian Schneider on Nov 9, 2018 at 10:42:20 pm

Hello creative people,

I’ve been thinking of a way to remove a moving subject from his background without rotoscoping.
Knowing that in my case, there isn’t any greenscreen.
More important though, knowing that i’m talking about shots with a static camera.

Is there a way in Adobe After Effects to tell the software :
- This is the shot of the background with the subject
- This is the same shot with the background only. Without the subject
- Pease (yeah I know, I’m polite with my softwares), AE, could you put out the subject from the first shot using the differences between the two shots ?

It seems so easy said this way. So easy that I would be surprise that such a feature doesn’t exist, right ?


PS: When I was a kid, I remember using my webcam with a software that could remove the background from me using this technique
The method was simple : I had to push a button, get away from my background for 5 seconds and then the background was gone once I was back in front of my webcam ! As simply as this.


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Dave LaRonde
Re: Remove a static background using the differences in the shot
on Nov 9, 2018 at 10:46:35 pm

Yes, you can do this with a difference key... or is is difference matte? I forget. But for best results, the backgrounds have to be identical down to the last pixel. Because that's how it works -- it compares corresponding pixels in the two shots. If there's the least bit of difference, it's opaque.

So no moving the camera, and no auto irises!

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


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