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How does facial recognition work?
Quick answer
Facial recognition works by mapping the unique geometry of a face — distances between features, shapes, contours — into a numerical 'faceprint', then comparing it against stored faceprints to find a match. Modern systems use neural networks trained on many faces.
Step by step
- A camera detects a face and locates key landmarks (eyes, nose, jaw).
- The system converts the face's geometry into a numeric signature.
- It compares that signature to a database to identify or verify.
- Accuracy varies and can carry bias from its training data.
People also ask
How does a phone recognize your face to unlock?
It builds a numeric map of your face and checks if a new scan matches the stored one closely enough.
Is facial recognition accurate?
Often very accurate in good conditions, but it can err and shows bias across some groups depending on training data.
What are the privacy concerns with facial recognition?
It can identify people without consent and enable tracking, raising surveillance and consent issues.
Part of the guide: How AI Works →