Deep learning is used for everything these days, but this face detection algorithm is so neat its still in use today. Dr Mike Pound on the Viola/Jones algorithm.
Viola/Jones Paper: http://bit.ly/C_RapidObjectDetectPaper
After detection you may want to ID the face: https://youtu.be/mwTaISbA87A
Hardware Hacking: https://youtu.be/eOPLQxGNmHA
EXTRA BITS: https://youtu.be/s2ciAt7KtZc
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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