What does faceid mean?

faceid refers to face ID, which is a face recognition system designed and released by Apple. It was first used in iPhone X; it allows users to unlock Apple devices, purchase in various Apple digital media stores, and as Authentication method for Apple Pay or in-app payments.

#This article covers the environment: iPhone X mobile phone, iOS 11.x system.

Face ID (English: Face ID) is a face recognition system designed and released by Apple, and was first used in iPhone X. This feature was first announced on September 12, 2017, and is intended to replace Touch ID rather than add a new security mechanism. It allows users to unlock Apple devices, make purchases in various Apple digital media stores (iTunes Store, App Store, and iBooks Store), and as an authentication method for Apple Pay or in-app payments.

Apple says the chance of unlocking the phone by someone other than yourself is one in a million. Apple also stated that facial recognition information is stored locally in the secure area of ​​Apple A11 Bionic and next-generation chips and will not be stored in the cloud.

The devices that can be used are:

• iPhone (X, Xʀ, Xs/Max, 11, 11 Pro/Max, 12/Mini , 12 Pro/Pro Max)

• ##iPad Pro (3rd, 4th generation)

##Principle

Face ID will first use a flood sensor component to illuminate the user's face to obtain a 2D infrared photo, then use an infrared camera to identify it, and then use a dot matrix projector to project more than 30,000 specific codes onto the surface of the object. The infrared points are reflected back to the infrared camera receiver. Using the offset between the infrared photos and the reflected infrared points, the object can obtain the depth information of the face surface, thereby constructing a 3D accurate model, and then the The infrared image and 3D precise model are sent to the processor and converted into a mathematical expression. After comparing the previously registered facial data, a conclusion will be drawn. The "Gaze Unlock" function is implemented by using an infrared camera to capture eyeballs and identify pupil characteristics. The technology providers are: SensoMotoric Instruments, PrimeSense, which provides structured light technology, and FaceShift, which provides facial capture technology.

Features

Flood Illuminator
Uses invisible infrared lighting to help identify faces , still available in dim light, enables infrared cameras to determine whether eyes are looking directly at the screen to ensure only the user can unlock it, and uses artificial intelligence to learn to remember continuous changes in appearance.

Dot matrix projector
projects more than 30,000 invisible positioning points onto the face to create a unique facial three-dimensional feature. In addition The arrangement and combination of each light spot on the emitter is also unique.

Infrared camera
Infrared camera is used to capture flat infrared images and read three-dimensional dot patterns at the same time. After the above two neural network analysis information is digitized, the data will be sent to the secure area in the A11 Bionic chip to confirm the match.

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