VIVOTEK
User's Manual - 51
Measurement Window: This function allows users to configure measurement window(s) for low
light compesation. For example, where low-light objects are posed against an extremely bright
background, you may want to exclude the bright sunlight shining through a building's corridor.
■ Full view: Calculate the full range of view and offer appropriate
light compesation.
■ Custom: This option allows you to manually add specific windows as measuring areas. The
measuring window refers to “weighed window“ where the lighting condition within the particular
area is taken into account. Camera firmware then adopts the weighed averages method to
calculate the value.
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.
■
Exposure mode: (Note that the Exporsure mode settings for IP8172P is different)
Select Auto or Manual mode according to your needs.
Manual: Select Manual to set a xed 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.
Include
Include
Exclude x
Exclude
x
x
x
A total of 9 inclusive and exclusive
windows can be created for a view. You
can create Exclude windows for the
camera to ignore the lighting condition
of certain areas.
Note that the title pane of the Include/
Exclude windows is not included into
the calculation. The inclusive and
exclusive windows can be placed
one on top of another. The inclusive
windows have a higher priority. You
can overlap these windows, and, if you
place an exclusive window within a
larger inclusive window, the exclusive
part of the overlapped windows will be
deducted from the inclusive window.
■ 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.
Screen for IP8172