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Tracking the circle of a circled object

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Annika Kumbier
Tracking the circle of a circled object
on Apr 10, 2015 at 2:17:59 pm

I want to place a red circle around someone and track the person's movement, so the circle follows the movement.

Of course I can just pick an ellipse from the effects window and track a person with keyframes. But I was wondering if there is some kind of automated way without using AE. I mean, it works great with blurred faces etc, but what if you want to circle a moving object? Someone got an idea?


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Richard Herd
Re: Tracking the circle of a circled object
on Apr 13, 2015 at 6:37:50 pm

For me, the issue is how "sticky" does your motion track need to be. For example, a shooter delivered to me hand held footage of a room full of people watching a giant television screen. My job was to replace the TV screen with custom content. So the motion tracking had to be very sticky. For that, I used Mocha, which is very easy to use plug in inside of After Effects. Seriously it is very easy. On another job I had to censor the picture with pixelation (much like you mention with faces), and for that I just keyframed quickly.

So yes the automated way is called Animation > track in mocha AE. There are many tutorials on how to use Mocha and it is so easy you can be up and running in a few minutes.



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Ann Bens
Re: Tracking the circle of a circled object
on Apr 14, 2015 at 10:53:06 pm

It is possible in Premiere.
Duplicate clip in V2 and draw mask with opacity and track the motion.
Now add ramp effect.
Copy path from opacity into ramp.
Mask expansion set to a negative value (width of the stroke) and invert.
Ramp colors both e.g. red.

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Ann Bens
Re: Tracking the circle of a circled object
on Apr 16, 2015 at 12:04:32 pm







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