Hi,
It is amazing how today films merge computer generated graphics with real world images. Many techniques and software are used to achieve this integration. One of the most important techniques is Match Moving (en.wikipedia.org/wiki/Camera_tracking), which consists on the extraction of motion information from a motion picture, particularly the camera movement, and its application to a computer generated graphic to be completely integrated into a footage. It is very impressive the results this technique can achieve.
Here you can see a simple example:
Match Moving can be done with many different software. Maybe the most widespread among the non professional community is the Adobe After Effects, although it is not very powerful. The most commonly used in the industry are Boujou, PFTrack, and Matchmoving, wich can be extremely accurate.
In this video you can see an example of use of Boujou software:
Best,
Julio
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