This is a pretty neat article describing post-production image processing to do "motion interpolation" and "image synthesis." Basically, automated removal of the camera rig from the frames and in-painting to fill in a crowd.
The algorithms described in this paper have been implemented as plug-ins by the authors and are now in widespread use within the post production community. Film credits include The Matrix films, the Harry Potters, Lord of the Rings, and many others, although part of the success of these techniques is that the average viewer is unaware of their use in a film.
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