The face detection in the iPhone 8 will be triggered “for a few hundred milliseconds”. It will be more reliable and faster than existing Touch ID, and be able to work in the dark. It is reported by Cult of Mac.
In addition to the usual sensors of the iPhone, it is expected that the upcoming phone will have a new “structured light” sensor that uses a curved infrared light to determine the depth of different points on the face. This means that you can trick the scanner by using a photo will not work.
Advanced features of the iPhone 8 at the face detection will allow Apple to abandon the physical Home button and Touch ID. That means the iPhone 8 will not need to use your fingerprint to unlock their devices or transaction Apple Pay.