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face detection

In digital camera terminology face detection, also called face-priority AF (auto focus), is a function of the camera that detects human faces so that the camera can set the focus and appropriate exposure for the shot automatically. When using a flash, face detection will also usually and automatically correct or remove the unwanted red-eye effect that can often occur when photographing people using a flash.

See in-camera red-eye fix.
See also "Digital Cameras" in the  Quick Reference section of Webopedia.

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