VIVOTEK
50 - User's Manual
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 0 to 8 (dark to
bright)�
■ Flickerless
: This function helps avoid the flickering on images because of the fast shutter
movement and the inconsistency between power line frequency (50 or 60Hz) and exposure time�
When selected, the exposure time will be forced to stay longer than 1/120 second. For cameras
that come with fixed iris lens, setting the exposure time to longer than 1/120 second may
introduce too much lights to the lens� Users can use this option to observe whether the result of
long exposure time is satisfactory�
■
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