VIVOTEK
User's Manual - 73
■ Iris Adjustment (this option is available when the Manual mode is selected):
The camera comes with a P-iris lens, which controls the iris opening with extreme precision by
its built-in stepping motor. Via software controls, the lens maintains the iris opening at an optimal
level at all times, resulting in superior sharpness and depth of field as well as image quality.
Once set, the iris will stay at current position as long as the lighting condition allows. When
external lighting conditions exceed an acceptable range, the P-iris mechanism adjusts itself.
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 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.
■
Exposure mode
:
In the LPC mode the exposure setting is defaulted to the
Manual
mode. The
LPC mode comes with a default exposure time (1/800 sec.) and gain control (40%) values. The
Iris size is tuned to the largest aperture.
Manual
: Select
Manual
to set a fixed exposure time and gain. Then, tune the slide bar 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.
