How come face unlock is so fast , such as OnePlus5/6, Huawei mate 10?

HelloAndoridWorld

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Aug 23, 2018
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When I tested, it almost unlocks instantly, it is very like less than 0.4 second.
Then how do they by pass the hardware limitation? Is better hardware applied or there are some tricks which users are not aware of.

Unlock time = (1) time to wake up camera from sleep mode and send image to unlock algorithm + (2) unlock algorithm running time

For mid-tier phone camera per my test time, the (1) part only will take more than 0.5 second, let alone plus unlock algorithm running time.

Do anyone have insights or details about their opening camera time and algorithm running time, how could these phones can do this so fast? Thanks in advance.
 

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