Facial recognition is now being used in a variety of areas. Explain the concept with special reference to its history, inner workings, applications and controversies.
Please write a 1200 word paper on this topic of facial recognition. The main body of the paper must cover four parts:：history of facial recognition technology, internal operation mechanism of facial recognition technology, applications of facial recognition technology, controversies of facial recognition technology.
Also list the name, author, date and source of the reference at the end.