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VIVOTEK
74 - User's Manual
The inclusive window refers to the “weighted window“; the exclusive window refers to the “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.
Include
Exclude
Weighted region
Ignored region
Include
Exclude
■
Flickerless: Under some circumstances when there is a difference between the video capture
frequency and local AC power frequency (NTSC or PAL), the mismatch causes color shifts or ickering
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. 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 long exposure time is
satisfactory.
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.
Exposure control:
■
Exposure level: You can manually set the Exposure level, which ranges from -2.0 to +2.0 (dark to
bright).
■
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.
■ BLC (Back Light Compensation): This option will automatically add a “weighted region“ in the
middle of the window and give the necessary light compensation.
Metering mode:
■ Auto: Firmware automatically determines an optimal exposure level.
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