HIKVISION TurboHD User Manual page 10

AGC: It's a form of amplification where the camera will
automatically boost the image output signal to optimize
the clarity of image in poor light conditions. You can set
the AGC value from 0 to 15. The AGC is disabled if the
value is set to 0.
Note:
The noise will be amplified if the AGC is on.
SENS-UP: Sense up increases the exposure on a signal
frame, which makes a camera more sensitive to light so
it can produce images even in low lux conditions. You
can set the SENS-UP as OFF or AUTO according to
different light conditions.
OFF: SENS-UP function is disabled.
AUTO: The SENS-UP function will atomically adjust itself
to x2, x4, x6, x8, x10, x15, x20, x25, and x30 according
to the different light conditions.
Note:
If you select shutter as AUTO or 1/25, the SENS-UP is
adjustable (OFF/AUTO), and the SENS-UP is disabled if
any other shutter speed is selected.
BRIGHTNESS: Brightness refers to the brightness of the
image. You can set the brightness value from 1 to 100
to darken or brighten the image. The higher the value,
the brighter the image is.
D-WDR: The digital wide dynamic range helps the
camera provide clear images even under backlight
circumstances. When there are both very bright and
very dark areas simultaneously in the field of view,
D-WDR balances the brightness level of the whole
image and provide clear images with details.
Set the D-WDR as ON to improve the image quality
under the backlight environment.
Set the D-WDR as OFF to disable the function.
3.4.5 BACKLIGHT
Backlight is applicable for the backlight or the high
luminance environment. You can set the Backlight to
BLC, HSBLC, and WDR.
BLC: (Backlight Compensation): If there's a strong
backlight, the object in front of the backlight will appear
silhouetted or dark. Based on the back area, BLC
enhances the brightness of the whole image, which
makes it possible to see the area in the strong backlight
clearly, but the backlight area will be over-exposed.
GAIN: The gain of BLC can be set as High, Middle, or
Low, the higher the gain, and the clearer the image is.
Follow the steps below to set a BLC area.
AREA: Click the up/down/left/right button to define the
BLC position and size. Select RET to go back to the BLC
menu or re-define the BLC area.
Default: Restore the BLC settings to the default.