Face tracking with Arduino, Processing and OpenCV
How this actually works is described about below but also in the video. I suggest you watch the video as my writing is terrible.
Video : http://www.youtube.com/watch?v=1cEp7duDbNU&feature=plcp
The Processing code : https://www.dropbox.com/sh/v9hkdxuoazoyb0d/fCGQzEfBAK The OpenCV and Arduino libraries are needed. OpenCV also needs to be installed onto the computer.
The Arduino code : https://www.dropbox.com/sh/ujjlahx83ilv1j2/QB0bu8E-EJ
[original story: Let's Make Robots]