How tech picks a face from crowd

FACIAL-recognition technology is now so accurate that a camera at a pop concert in China spotted a wanted man in a crowd of 60,000.

It works by CCTV cameras capturing the features of every person they see, then comparing them to images of known criminals or suspects stored on a ‘watchlist’.

If the system thinks anyone in the live footage matches a person on the list, it sends out an alert and officers can move in.