Dahua IR High Speed Dome Camera User Manual page 13

of time is configured for auto-focus resuming, once there is no controlling
order received, after the period of time, the IR High-speed Dome Camera will
resume auto-focus.
Under the following circumstances, the camera module can not carry
out auto-focus:
● When the object is not in the center of the view.
● When simultaneously observe a far object and a near one, clarity for both of
the images can not be guaranteed at the same time.
● When observing objects with extreme brightness, such as neon lights,
spotlight, etc
● When the object is behind the glass with water drops or dust
● When the object moves very fast
● When the object is large-sized and drab, such as wall
● When the object is too dark or fuzzy
Iris Control
● The system takes automatic-iris as the default. The iris can automatically
sense the change of the environmental light and make quick adjustment, so
that the brightness of the image is stable.
● The user can manually adjust the iris through controlling the keyboard to
obtain desired brightness for the image.
Automatic Back Light Compensation (BLC)
Automatic Back Light Compensation can be realized via district dividing.
In extremely bright background, the camera module can compensate the
brightness of the relatively dark objects, while adjust the light of the bright
background, avoiding that the whole image is too bright to watch due to the
too high brightness of the background while the object is too dark to be
distinguished, so that clear image can be got.
Automatic White Balance
According to the ambient brightness, the camera module can
automatically adjust the White Balance to re-display the real colors.
- 12 -