Film
   - All processing is not done with single pictures.  
 
   - You often want to look at a moving picture to see how
       things change.
 
   - As you probably know, you can do this with 30 frames per 
       second.
 
   - It's like flipping through a stack of pictures; they look like
       they're moving.
 
   - What's usually important is what changes from picture to picture.
       (Neuromorphic cameras and prallel processing.)
 
   - To manage this, you need to match items in the two (or more 
       pictures).
 
   - You then need to see how they are changing.
 
   - This matching process usually starts with line and edge detection,
     but then correlating lines from one picture with lines from the other.