Leica Q3 Instruction Manual page 188

PERSON DETECTION (FACE DETECTION)
Person detection is an expansion of the face detection feature. In
addition to biometric patterns of faces, the camera also detects
body patterns and uses them for focusing. Tracking will therefore
continue, once a person is detected and measured, even if the face
may not be in view at some point. This feature prevents inadvertent
"jumps" to other faces if several persons are in the frame.
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RECORDING VIDEO ▸ FOCUSING
When face detection detects an eye, the focus will be on that eye.
Should more than one eye be detected, then the user can choose
the eye to focus on. The currently selected eye will be highlighted.
Additionally, the desired face can be easily selected if there are
several faces in the frame.
Toggling between faces and/or eyes
▸ Press the directional pad in the relevant direction
EYE/FACE/BODY + ANIMAL DETECTION
This version of Eye/Face/Body Detection also includes the recogni-
tion of some typical pet types.