Edge detection with Cellular Automata

[Allan]

Hi!

https://www.youtube.com/watch?v=btLgq2pt-gc

This video got me fasinated. But how does it work? I have implemented 1 dimentional
automata and game of life. But this one, i have no idea. If someone could explain how it
works or post a link to a tutorial or mention a book that deals with this, that would just be
super.


//Allan