How does your computer see you?

Well how do you look when you see a new math problem?  Facial recognition software uses a set of measurements (distance between eyes, width of nose, etc.) to create a numerical “faceprint” for a particular image, which can then be compared with a database. 

Mood Battle is an experiment to detect emotions by comparing measurements from a face.  If you have a webcam, try out some different emotions on it.  But if it mistakes your angry face for a happy one, remember: it’s only looking at numbers.