Vivotek FD9165-HT, User Manual

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VIVOTEK
User's Manual - 75
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:
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. You can also configure the iris size to control
the amount of light. 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.
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 an 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 be calculated out of the remaining of the
inclusive window.
■ BLC (Back Light Compensation): This option will automatically add a “weighted region“ in the
middle of the window and give the necessary light compensation.
Include
Exclude
Weighted region
Ignored region
Include
Exclude
Auto : If you set Exposure mode as Auto , the Exposure time and Gain control will not be
configurable since the sensor library will automatically adjust the value according to the ambient
light. Then you can configure iris mode as “indoor” or “outdoor” to reach the best image quality.
■ Iris mode : Select Indoor or Outdoor iris mode to adapt to the installation. The preset iris aperture
setting will apply.
■ HLC : (Highlight Compensation). Firmware detects strong light sources and compensates on
affected spots to enhance the overall image quality. For example, the HLC helps reduce the
glares produced by spotlights or headlights.