Dahua NVR21-4KS3 Series, User Manual

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User's Manual
178
Parameter Description
Mirror
Switch the left and right sides of the video image. It is disabled by
default.
This function is available on select models.
Flip Set video display direction. It includes normal, 180°, 90°, and 270°.
AI SSA
After you enable AI SSA (AI Scene Self-adaptation), the camera can
detect environmental conditions, such as rain, fog, backlight, low light
and flicker, to adjust the parameters of the image to suit the
conditions, ensuring that clear images are always produced.
When AI SSA is enabled, some image parameters such as exposure
and backlight mode will become unavailable.
Exposure
Auto Iris
●
This function is available when the camera is
equipped with the auto iris lens.
●
After you enable auto iris function, the iris can
automatically zoom in and zoom out according
to the brightness of the environment and the
image brightness changes accordingly.
●
If you disable the auto iris function, the iris is at
the biggest value. The iris does not
automatically zoom in or zoom out according
to the brightness of the environment.
3D NR
This function specially applies to the image whose
frame rate is configured as 2 at least. It reduces the
noise by using the information between two
frames. The bigger the value is, the better the
effect.