User`s manual
VIVOTEK
User's Manual - 53
Exposure control:
■
Exposure level: You can manually congure the Exposure level, which ranges from -2.0 to +2.0
(dark to bright). You can click and drag the pointers on the Exposure time and Gain control
slide bars to specify a range of shutter time and Gain control values within which the camera can
automatically tune to an optimal imaging result. You may prefer a shorter shutter time to better
capture moving objects, while a faster shutter reduces light and needs to be compensated by
electrical brightness gains.
■ Custom: This option allows you to manually add a specific window as a measuring area. The
measuring window refers to “weighed window“ where the lighting condition within the particular
area is taken into account. The Exclude window tells the rmware to ignore the lighting condition
of a specic area. Camera rmware then adopts the weighted averages method to calculate the
value. You can create up to 10 inclusive and exclusive windows.
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Include
Exclude
Include
Weighed region
Ignored region
■ BLC: When selected, a BLC window will appear on screen meaning that the center of the scene
will be taken as a weighed area. This option enables light compensation for images that are too
dark or too bright to recognize; for example, for the dark side of objects that is posed against
bright sunlight.
■
Exposure Time: The congurable max. exposure time is tunable according to lighting conditions
with values ranging from 1/32000 to 1/5 of a second.
■
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.
Measurement Window: This function allows user to set measurement window(s) for low light
compensation.
■ Full view: Calculate the full range of view and offer appropriate
light compensation.
■ Flickerless
: This function helps avoid the flickering on images because of the fast shutter
movement. When selected, the exposure time will be forced to stay longer than 1/120 second.
■
AE speed adjustement:
AE (Automatic Exposure)
AE automatically controls iris opening size for the varying levels of brightness. The conversion
speed, if this function is enabled, is configurable for varying lighting conditions. This makes the
camera well-adapted to fast changes in lighting conditions, such as entering or leaving a tunnel.
The Sensitivity option determines how fast the AE speed adjustment adapts to the changes in the
environment.