Vivotek SF8174 User Manual download pdf (Page 68)

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68 - User's Manual

The inclusive window refers to the “weighed window“; the exclusive window refers to “ignored window“.

It adopts the weighed 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.

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 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. 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.

Include

Exclude

Include

Exclude

Weighted region

Ignored region

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Vivotek SF8174 User Manual Page 68