Vivotek FE8172 User Manual page 54

VIVOTEK
The inclusive window refers to the "weighted window"; the exclusive window refers to "ignored window".
It adopts the weighted averages method to calculate the value. The inclusive windows have a higher
priority. You can overlap these windows, and, if you place a exclusive window within a larger inclusive
window, the exclusive part of the overlapped windows will be deducted from the inclusive window. An
exposure value will then calculated out of the remaining of the inclusive window.
Include
■ BLC (Back Light Compensation): This option will automatically add a "weighted region" in the middle of
the window and give the necessary light compensation.
Exposure control:
■ Exposure level: You can manually set the Exposure level, which ranges from -2.0 to +2.0 (dark to
bright).
Flickerless: Under some circumstances when there is a differnece between the video capture
frequency and local AC power frequency (NTSC or PAL), the mismatch causes color shifts or flickering
images. If the above mismatch occurs, select the Flickerless checkbox, and the range of Exposure
time (the shutter time) will be limited to a range in order to match the AC power frequency. See the
screen capture below.
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 automaticallly
tune to an optimal imaging result. For example, 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.
54 - User's Manual
Exclude
Include
Weighted region
Exclude
Ignored region