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VIVOTEK
User's Manual - 51
Exposure control:
■
Exposure level: You can manually set the Exposure level, which ranges from -2.0 to +2.0 (dark
to bright). You can click and drag the semi-circular 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.
■ 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
q long exposure time is satisfactory.
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: 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 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.