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Changing background scenery in a video footage?
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sweeto10
Junior Member
_ 		18. October 2008 @ 12:34 _ Link to this message    Send private message to this user   
Hi folks,

Firstly I apologise if this is in wrong section.... secondly Ive got some video footage with poor background scenery, i want to get rid of it and put a deferent scene behind. How would I do that? Is it possible to do to video? If u dont understand me, then check out mortal kombat movie, or 300 movie with different computerised background. But obviosly I only want to use static images as my background.

Its like in photoshop, you can select the background and delete it, can u do the same for video???

Please help!!!
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This message has been edited since posting. Last time this message was edited on 18. October 2008 @ 12:37
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Peshtigo
Senior Member
_ 		18. October 2008 @ 13:43 _ Link to this message    Send private message to this user   
"Its like in photoshop, you can select the background and delete it, can u do the same for video???"

Is it possible? Sure, you see it all the time in commercial movies and TV. Can it be done on a home computer? I'll guess "no", but I can't wait to hear some other answers.
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ugc
Senior Member

11 product reviews
_ 		20. October 2008 @ 15:03 _ Link to this message    Send private message to this user   
Originally posted by Peshtigo:
 "Its like in photoshop, you can select the background and delete it, can u do the same for video???"

Is it possible? Sure, you see it all the time in commercial movies and TV. Can it be done on a home computer? I'll guess "no", but I can't wait to hear some other answers.
I am going to 2nd that too.

I don't believe it is possible without spending a lot of money on commercial equipment to do this, or, spending way too much time editing it on your own frame by frame.
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varnull
Suspended permanently
_ 		20. October 2008 @ 18:17 _ Link to this message    Send private message to this user   
http://www.videoforums.co.uk/general-sof...e-backdrop.html

You aren't going to achieve it with a ready made movie... unless you want to do every frame by hand.. 1500-1800 frames a minute.

http://store02.prostores.com/servlet/tub...hromakey/Detail

will do it.. I tried an experimental open source version of the same over the weekend (I have a supercomputer upstairs) and results were poor.. even after defining and edge detecting the moving foreground scene it was very obviously overlaid and patchy.

5 minutes took 7 hours of processing time.. on a cluster which is about the same as 4x2.6ghz quad cores with 26 gigs of ram. I tried optimising the software and streams, but tining errors were cumulative because of the different chroma and luma values for each frame made each frame a different time to process.

Give me a Cray and maybe I can get somewhere.. otherwise it was an interesting experiment in pointless.

This is much easier to achieve if you set it all up properly in the first place.. say by filming your foreground action against a chroma-neutral background and then going filming your location.. remembering carefully the movements of your foreground action.. and making sure it has a lower chroma/luma value than your foreground action (err.. what?? hehehe).. then simple chroma key overlay with an analog video desk is easy.
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Peshtigo
Senior Member
_ 		20. October 2008 @ 19:21 _ Link to this message    Send private message to this user   
In other words, no, not on your home computer.
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