Rotoscoping

Out of the Inkwell was a silent animated series  produced by Max Fleischer.  Max Fleischer came up with the rotoscope concept to simplify the process of animating each individual frame. Rotoscoping is a technique in which you trace over footage frame by frame for use in animated films.





The image below shows how rotoscoping began.

This is another video with some cool rotoscoping involved. It's awesome how you can use the same clip to rotoscope into several different videos Rotoscoping saves so much time and leaves you with a realistic looking clip.
There are also reasons to rotoscope. Some rotoscope to animate a scene completely using a live action reference; or to add animation to live action scene while tracking camera movement.