Xerox Invents blood pressure check with standard webcam

If it had not already been done but opensource groups and MIT over a year ago.

http://news.yahoo.com/blogs/this-could-be-big-abc-news/camera-measures-pulse-afar-164307817.html

Difference for Xerox is using colortones to do the trick.

http://triblive.com/business/headlines/3656658-74/technology-xerox-webcam#axzz2Ps2T0Nz1