User`s manual
VIVOTEK
User's Manual - 47
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 compensation.
■ 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 and exposure time. When
selected, the exposure time will be forced to stay longer than 1/120 second. For cameras that
come with xed 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
: The Exposure time allows tuning for more or less light to enter the lens. The
congurable value ranges from 1/32000 to 1/5 of a second. An optimum shutter speed should be
maintained as long as the light level of the scene permits.
■
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 noise, and that the gain control, lighting levels,
and picture performance are closely related.
Note that 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. Firmware will then automatically tune the Gain, Exposure time, and Iris
opening within the ranges you specied.
BLC