Unlocking a phone with a face? Why doesn't the phone need thousands of example pictures before it works? Dr Mike Pound explains how it might work...
Face Detection: https://youtu.be/uEJ71VlUmMQ
This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: https://bit.ly/nottscomputer
Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com