Has Apple's facial recognition been revealed?

Apple's iPhone 8 is, according to the latest rumours at least, set to rely on facial scanning rather than a fingerprint. However, details on exactly how this could work have been scarce - until now. A recent patent application reveals how such a system could work on Apple's Mac desktop and notebook computers. The patent shows how a camera can remain in low power mode, but'fire up' when a face is spotted, allowing a facial recognition system to operate without impacting heavily on battery life It explains the system can remain in a low power mode until sensors spot a face, and can then'wake' the computer to analyse the face. The patent describes a number of variations on the theme.