Uncover ' Liu ' veil, explore face recognition Sitri Latest analytics iphone x and Vivo X20 with the release of iphone x, 3D face recognition has become a new technology in people's mouths, meanwhile, the release of domestic vivo X20 also mentions its features of face recognition, Let Sitri's professional team lead us to uncover the mystery of face recognition. Start with Apple's iphone x and let's take a look at what sensors are in this lovely ' Liu '. Do you know the sensors in ' Liu ' that have a lot of new nouns? For example, ' dot-matrix projector ' and ' pan-optical sensor ', as well as an infrared camera that has never been seen in iphone smartphone products. These new devices appear because iphone x introduces the face recognition system. Before introducing specific sensor information, let's start with a brief introduction to the starting step of face recognition. Step 1: When an object approaches the cell phone, the distance sensor (ToF) is first activated. Step 2: The start of the distance sensor (ToF) will inspire the pan-optical sensing elements and infrared cameras, the VCSEL chip in the pan-optical sensor will emit several infrared light, infrared light reflected back by the infrared camera to capture, to determine whether the face information. Step 3: If a person faces information through judgment, will start the lattice projector, the lattice projector will emit about 30,000 infrared structural light points, and by infrared camera to capture 3D face information, the image of human face information extraction, through A11 bionic processor comparison, to obtain face recognition information. The following is the point, bringing the iphone x 3D face recognition sensor disclosure. Start with the whole structure and the main parts of the iphone x. iphone x machine structure diagram iphone x main parts bitmap projector lattice projector and two camera heads (IR camera and front camera) are integrated on a module. The module scanning module-The lattice projector and obtains a separate lattice projector module. Lattice Projector module photo-lattice projector module-in the lattice projector there is a Vcsel chip, when the lattice projector is started, the infrared light emitted by the Vcsel chip is projected through a collimated lens on the top of the chip, through two specular mirrors, and finally through an optical diffractive element (DOE) The formation of about 30,000 more than one infrared structure light is projected. Lattice projector (before opening) lattice projector (after opening) to the above collimation lens and optical diffractive element module to uncover, you can clearly see the following Vcsel chip. Vcsel Chip Optical microscope Light sensing element, the sensor and a control chip are encapsulated together, the following diagram is the entire package of microscopic photo. The whole module optical microscope, as shown in Fig.-, Vcsel chip plays the role of Pan-optical sensing (emitting infrared light). Distance sensors as described above, the entire module within the range sensing chip from the Stmicroelectrics TOF chip, this chip in the iphone7+ has been used. Distance sensing TOF chip-optical microscope ambient light sensor iphone x's ambient light sensor, unlike the previous ambient light sensor, becomes oblate and long, which may be due to insufficient space and the chip is also fitted with a diffusion film. Ambient light sensor package scanning environment light sensor package-take off the diffuser above, you can see the entire ambient light sensor chip and the glass translucent film above. Front camera Front camera scan front camera-front camera optical microscope-lens Infrared Camera infrared camera scanner infrared camera-infrared camera optical microscope-lens In addition to these sensors, the IPhone X's face recognition also has a huge contribution from its powerful bionic processor A11. A11 Processor A11 Optical microscope The Apple iphone x's ' Liu ' also has a microphone sensor from the building. Microphone Sensor Microphone Optical microscope after taking care of the "Liu" of the iphone x, we'll look at what sensors are on vivo X20 's face recognition function. As shown above, the Vivo X20 face recognition sensor contains a front-facing camera and a distance sensor, two of which are the same type of chip, all from AMS products. In particular, we found an LED light on the edge of a distance sensor in vivo X20, and wondered if it was related to the Vivo X20 ' backlighting. Vivo X20 machine structure Figure Vivo X20 main parts figure LED light LED light microscope LED light-distance sensor distance sensor optical microscope distance sensor-camera Front camera module scan front camera-photo Front camera optical microscope-lens watched the iphone x and Vivo X20 sensors, do not know you for 3D face recognition there is no further understanding? Subsequent Sitri will further analyze the other sensors and chips in these two handsets.
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