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There are various techniques, mostly based on two main themes.
1. use a few frames where the character is in different parts of the shot, to paint up one master still that is clear of the character. Might have to do a bit of cloning to fill in areas that remain hidden right through the shot. Once created, you can pop this into the shot, and if it is a locked off (camera not moving) shot, all is sweet (add grain to suit and track in new head). If the shot is moving, you'll need to track this clean painted plate element into the shot (using 2d corner pinning or even as a 3d card if you use matchmoving software such as Boujou, Syntheyes, Matchmover, PFTrack, etc). This will work for shots that keep a similar framing.
2. a bit of good old fashioned clone work, ...this is sometimes the only way if you have a wild camera move that you can't make a plate up for using the above technique (a bit of motion blur added to such work will hide a few jitter sins, ...but still not fun).
Other options include high end solutions such as Mokey (which uses optical flow to extract a designated foreground object from a background, and tries its best to paint in the missing background detail).
Goodluck!
andrew
:-)
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