Super-imposing A still face on a moving image

kraz wrote on 5/5/2011, 7:23 AM
I have a video - that pans etc and in it is a person who is sitting fairly still -
I would like to superimpose a different still image of a face onto that person but have it stay/track will them for the whole clip.

Besides adding a keyframe (and moving the still face) each frame is there some other way to do this?

It will not look real - that I know - but so far I just have the face chasing the body during the video

Thanks
Allen

Comments

Chienworks wrote on 5/5/2011, 8:41 AM
Since Vegas doesn't have motion tracking, keyframes are the best way to do this in Vegas. You may not need to add one every frame though. I'll start out just adding one every time the motion changes. Then i'll put the cursor between a pair of keyframes and see how far off the positioning is and add another keyframe if necessary. Continue subdividing until the motion is smooth enough. Sometimes i've been able to get away with a keyframe every 10th frame or so on average. Of course, the more the movement changes the more keyframes you'll need.
Sidecar2 wrote on 5/5/2011, 9:15 AM
The Boris Continuum Complete 7 plugin suite for Vegas 10c can do this. But it will cost you several hundred dollars.
kraz wrote on 5/6/2011, 4:32 AM
I am playing with a trial of Boris - and with YouTube trying to understand how I can take an effect and have it move with the Motion Tracker ...

Assuming I do get that far - what effect can I use to have the track object be an image

thanks

farss wrote on 5/6/2011, 6:33 AM
"Assuming I do get that far - what effect can I use to have the track object be an image"

It's not an effect as such. Excuse my use of After Effects terms but the concept is the same in any application. You use a tool to track one or more points on the item of interest. That tool creates a set of co-ordinates for each specified time interval then that set of co-ordinates is used to move the new object so that it tracks the one you wish to replace.

Say you wished to replace a poster on the back of a bus as it drove psst. You may track each corner of the poster and then use that data to map a new image onto the original poster on the bus. Having the four corners allows for skew to be taken into account.

On the other hand if you just wanted to have some text follow along above the bus tracking one point may be adequate. To get a very realistic face replacement you would need many points as a face is a complex 3D shape. That also depends on if the face itself moves, once it gets that complex you need more than After Effects or Vegas if you really want to fool audiences today. If it's just for fun then a single point track might be good enough

Bob.
kraz wrote on 5/6/2011, 6:51 AM
Thanks - I actually found what I was looking for -

It is a composite mode in Boris called BBC Match Move

John Rofrano has a great YouTube movie of how to use it


and I has to watch it quite a few times and work step by step with him
- and WOW it is amazing - now just have to rationalize the price ...
Laurence wrote on 5/6/2011, 8:07 AM
I bought BCC7 back when it was at the low introductory price, not knowing exactly what it was or how I'd use it. Boy am I glad I did!
LReavis wrote on 5/6/2011, 1:36 PM
I agree the BCC7 has save me enough time to be worth the $600 that I recently paid. I highly recommend it to anyone who considers their time to be valuable (the motion tracker was the one that sold me), and to those who want excellent results (the chroma-key is significantly better the New Blue and others that I've tried).