Here's a simple example using the same colour tracking as the Sticky Striker post-it tracker. Keep in mind that this is not a finished technology and can be optimised and fine tuned.

If you don't have a webcam, this is what it looks like:

Or if you have one and want to try it:

If you want to know more about this, feel free to email me us at andre@lemondigital.com or rodrigo@lemondigital.com