For a deeper walkthrough on how this one works, check out the Hackaday post. I received a lot of fantastic in the comments, including some great tips to research papers doing the exact same thing!

Here were a couple links where others have dug even deeper:

• http://www.ccrc.wustl.edu/~roger/papers/cg09.pdf
• http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.83.5786&rep=rep1&type=pdf

(A special thanks to the commenters on Hackaday and Hackernews for finding these!)