emotion recognition technology

This year Facebook filed two very interesting patents in the US. One was a patent for emotion recognition technology; which recognises human emotions through facial expressions and so can therefore assess what mood we are in at any given time-happy or anxious for example. This can be done either by a webcam or through a phone cam. The technology is relatively straight forward. Artificially intelligent driven algorithms analyses and then deciphers facial expressions, it then matches the duration and intensity of the expression with a corresponding emotion. Take contempt for example.