What Face ID really sees every time it unlocks your phone 2026

David Hansen
What Face ID really sees every time it unlocks your phone
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"The serial number of a human specimen is the face, that random and unrepeatable combination of characteristics," writes Milan Kundera in the book Immortality in 1988. He kept the adjectives random and unrepeatable.

The human face is perhaps the most powerful communication tool we have. Before we speak, before we touch, before we introduce ourselves, we look. Within fractions of a second we can recognize the age, gender, emotion, and even the intentions of the person in front of us.

Even newborns do it, since their gaze is magnetized by the faces that are often above them and looking at them.


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The recognition of faces is so fundamental to our social life that it is not surprising that a large part of the brain, specifically the cortex of the area with the most complex folds, is dedicated to a process of processing faces and their identity. We recognize whether someone is looking at us or not. We distinguish expressions of emotions, joy, fear or anger. Functional brain imaging has identified a group of adjacent areas, called the fusiform face area (FFA), located on the left and right sides of the brain, at the base of the cerebral cortex. The FFA increases its activity when people look at portraits or close-ups of faces, or even when they just think about those images. Faces, however, are not only carriers of identity and emotions. They also act as a "key" or rather a digital fingerprint that can unlock from one device and one account to our entire daily life. Yes, you guessed right. We are referring to Face ID. When Face ID unlocks our mobile, it doesn't look at the face as the human eye sees it, but we could say that it translates it. How does it do this? By projecting around 30,000 tiny infrared dots onto the user's face, which create a detailed 3D map, allowing the system to recognize facial structure rather than just a flat image. That is why the technology works in different lighting conditions, even in total darkness.

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David Hansen

Author

David Hansen

An engineer, author and high-tech enthusiast whose passion has been evolving for 12 years. After contributing to numerous online publications, David shares his experiences and discoveries on Grand Goldman. He focuses on Smart Homes, Connected Devices, and how they will improve our lives and society in the future.


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