Vivotek FD8154 User Manual download pdf (Page 51)

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User's Manual - 51

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.

■Flickerless

: This function helps avoid the flickering on images because of the fast shutter

movement and the inconsistency between power line frequency (50 or 60Hz) and exposure time.

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

a long exposure time is satisfactory.

Measurement Window: This function allows user to set measurement window(s) for low light

compesation.

■ Full view: Calculate the full range of view and offer appropriate

light compesation.

■ 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.

■ Custom: This option allows you to manually add a specific window as a measuring area. The

measuring window refers to “weighted window“ where the lighting condition within the particular

area is taken into account. The Exclude window tells the rmware to ignore the lighting condition

of a specic area. Camera rmware then adopts the weighted averages method to calculate the

value. You can create up to 10 inclusive windows.

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Vivotek FD8154 User Manual Page 51