VIVOTEK
User's Manual - 49
Measurement Window: This function allows user to set measurement window(s) for low light
compesation�
■ Full view: Calculate the full range of view and offer appropriate
light compesation�
■ BLC (Back Light Compensation): This option allows you to use the center of the current view
as the measuring area� The measuring window refers to “weighted window“ where the lighting
condition within the particular area is taken into account� Camera firmware then adopts the
weighted averages method to calculate the value and provides necessary light compensation�
Exposure control:
■
Exposure level: You can manually set the Exposure level, which ranges from -2.0 to +2.0 (dark to
bright)�
■
Exposure mode: (Available for IP8152 using a DC-iris lens) - Select Auto or Fixed mode
according to your needs�
Auto: If you set Exposure mode as Auto, the Exposure time and Gain control will not be
congurable since the sensor library will automatically adjust the value according to the ambient
light. Then you can congure iris mode as “indoor” or “outdoor” to reach the best image quality.
Fixed: Select Fixed mode to set a fixed exposure time and gain� Then, tune the slide bar
pointers to set the Exposure time and Gain Control to the best image quality� A shorter exposure
time allows less amount of light to enter the sensor; while a higher gain control value generates
certain amount of noises�
■ Flickerless
: (for IP8152 using a xed lens) This function helps avoid the ickering on images
because of the fast shutter movement� When selected, the exposure time will be forced to stay
longer than 1/120 second�
■
Exposure time: you can split the round pointers on the Exposure time and Gain control slide
bars into two halves and drag them on the bars to designate a range of values in which rmware
can automatically adapt to� Note that Firmware will then automatically tune the Gain, Exposure
time, and Iris opening within the ranges you specied. For example, in low-light condition, you
may prefer a longer exposure time and more electronic gains� However, the noises in the image
will also increase�
■
Gain control: Tune the slider bar to set the Gain Control to the best image quality. Higher gain
control value will generate a certain amount of noises, and that the gain control, lighting levels,
and picture performance are closely related�
Click the Save button to preserve your conguration.
BLC