Xiaomi Mi 8 Review

12 June 2018, 16:35:13

Xiaomi Mi 8 Review
You can get a Xiaomi Mi 8 from Geekbuying with a $6 coupon based on the sale price, if you subscribe to their newsletter from the 6th Anniversary discounts page.

Sensors

Xiaomi Mi 8 packs an advanced bundle of sensors including an accelerometer, magnetic field, orientation, gyroscope, light, pressure, proximity, gravity, linear acceleration, rotation vector, uncalibrated magnetic field and gyroscope, game rotation vector, geomagnetic rotation vector, significant motion, step detector and step counter. The device is equipped with a rear-mounted fingerprint sensor from Fingerprint Cards - model FPC1291. Reaching the sensor is quite natural when you hold the device with one hand. It is incredibly fast in storing fingerprint IDs and unlocking the device without any errors. Fingerprint IDs can be used for authorizing purchases and accessing locked apps. In addition, even if you don't have any IDs stored, you can use the sensor as an alternative tool within certain apps such as a shutter in the Camera app. Only the Mi 8 Explorer Edition has an in-display fingerprint sensor (3rd generation Synaptics Clear ID FS9500), which is the first pressure-sensitive screen fingerprint solution on a smartphone. When it unlocks it give a haptic feedback. The Mi 8 Explorer Edition takes face unlocking a step further by employing a laser 3D structured light system composed of a series of elements such as a dot matrix projection.

How does the infrared face unlock work on Xiaomi Mi 8

Active infrared imaging technology is at the core of Xiaomi Mi 8's infrared face unlocking function. In terms of hardware, the technology uses two main parts - an infrared light emitter and an infrared camera with an OmniVision OV7251 sensor. The first actively emits infrared light with a wavelength of 940nm to the human face. After the face is lit up, the 3μm pixel sensor makes an image. The smartphone processes that image by first removing the noise and environmental information. Then it extracts 4096 facial points and checks them against the facial data you have already stored in the phone with your face ID. If there's a match, the device will unlock. This type of technology has several advantages compared to the use of the front camera's face unlocking technology. For starters, it does not depend on good lighting in order to recognize the face, so it is faster and more accurate. You can unlock the Mi 8, even if you're in a dark room at night. Secondly, infrared unlocking technology is more secure - due to its nature it cannot perceive photos, videos, or 3D-printed masks as live faces. Finally, this technology works even if you wear sunglasses because it penetrates the glass and can achieve a high percentage of matching facial points. The OV7251 used by the infrared camera is a black and white CMOS CameraChip sensor with OmniPixel3-GS technology. It is created especially for use cases of gesture detection, head and eye tracking, depth and motion detection. The sensor has a 1/7.5-inch size, uses a global shutter for removing unwanted image artefacts and can work in multiple low-power modes, including a light-sensing mode. In this mode, the OV7251 behaves like an ambient light sensor, which wakes the sensor up from "sleep mode" only when a change in light has been detected.

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