Biometric device: Technology that uses a person’s individual biochemical makeup to authenticate usage of computers, smartphones and other devices.

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Apple’s Face ID runs on the TrueDepth sensor that consists of an infrared camera, flood illuminator, proximity sensor, and dot projector.
The TrueDepth sensor detects infrared light to see the geometry of your encounter and sends it to the A11, A12, A13, A14, or A15 Bionic chip.
That chip results in a mathematical style of your face, which it stores for reference.
Pose, illumination, and expression are three factors that determine the precision of face recognition.
The dot projector generates over 30,000 spots of invisible infrared light to make a three-dimensional map of one’s facial landscape.

However, these methods have their limits as the skin does not create a high enough focus of volatile compounds for devices to detect.
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The iris may be the pigmented, annular muscular curtain near the front of the eye, which controls the dimensions and size of the pupil.

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“Flush with EU funds, Greek police to introduce live deal with recognition prior to the summer”.
“At least 11 police forces use face recognition in the EU, AlgorithmWatch reveals”.