FaceID allows a user to unlock their own iPhone, or make Apple Pay transactions, merely by looking at the phone's front-facing TrueDepth camera. It replaces TouchID, which identifies an iPhone user by reading a fingerprint.
The iPhone X's TrueDepth camera uses three new components to accomplish face recognition:
- The Flood Illuminator uses infrared light to invisibly illuminate the user's face, even in low-light situations.
- The Dot Projector projects over 30,000 individual dots of focused infrared light onto the user's face.
- The Infrared Camera reads the combined data of the Flood Illuminator and Dot Projector.
Information supplied by: