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Replace moving object

Posted: Thu, 22nd May 2008, 1:15am

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Force: 0 | Joined: 22nd May 2008 | Posts: 2


Evaluating CL for a project and am wondering if I can use it to "replace" a moving object? A man running with an object under his arm - want to replace it with another object - (I can take still photos of the new object on green screen from various viewpoints to match change in position of the moving object) Is that possible with CL or is it going to be a frame by frame edit with photoshop?

Posted: Thu, 22nd May 2008, 1:57am

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Force: 1537 | Joined: 27th Dec 2006 | Posts: 767

VisionLab User FXpreset Maker Windows User

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Hi there Barna8us, welcome to the forums,

What you are asking is completely doable in CLab. There will be frame-by-frame work (especially animation) and you will probably have to use masks to take out parts of the object at some points, but yes, it is possible. Of course, this really depends on the objects you are using, and the shot itself, but the simple answer is yes.

First, you'll need to take out the original object (except if the object you'll be replacing the first one with is bigger, in which case that would just be an unnecessary headache). Then, put the object you want to add to your video on the timeline, animate it to be the right size, then frame-by-frame, make it follow the running man. You might want to add some blur with the "blur: angle" filter, making it stronger on some frames, weeker on other (you can do that with keyframes!) to match your original footage.

Anyway, once you've finished animating the object frame-by-frame, you'll probably need to mask out some parts of it where the man's arm is in the way (if that's the case). Again, frame-by-frame work will be necessary (CLab doesn't have any tracking abilities, you see).

If you're not familiar with animation, I recommend watching this video tutorial.

Also, this text tutorial might help you with incorporating the different angles of the object together (skip to the part where Tarn talks about animating the flying girl). You're only gonna need that if your camera moves in 3D space, not just following the man in a more-or-less straight line, in which case only 1 picture of the object will do the job.

I hope this answers your question! razz

Posted: Thu, 22nd May 2008, 3:46am

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Force: 0 | Joined: 22nd May 2008 | Posts: 2


Thank you so much for such a thorough answer!! I will begin my project using CLab following your advice!

Posted: Fri, 23rd May 2008, 11:30am

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Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

While this is indeed theoretically possible, it's worth pointing out that it will be extremely difficult to get it to look good (depending on the specifics of the shot, at least).

Good luck, though! smile