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viii
Note for Face Detection
To use the camera’s built-in face detection feature (see 3.5.1.7 Face Detection), which is
only supported by certain models, it is recommended to install the camera according to the
criteria listed below:
Surveillance Condition
• The camera shall be installed at a site with uniform, sufficient lighting, where the
face(s) to be detected are fully illuminated.
Example of Recommended Scene
Example of Non-recommended Scene
Camera Position
• The camera shall be mounted at a recommended height of 2.5 ~ 3 m (8.2 ~ 9.84 ft).
• The camera shall be mounted with a recommended depression angle of around 10°.
• The camera shall be positioned so that the face(s) to be detected are directly aligned
with the lens of the camera, with a horizontal deviation of no greater than 30°, a
vertical deviation of no greater than 15° and a face size of at least 120 pixels.
Surveillance
area width
Horizontal line
Depression angle
α
Optical axis of
the camera
Pedestrian walking direction
(straight along the center of
the ground)
Horizontal surveillance distance
Device mounting height
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