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VIVOTEK
72 - User's Manual
Before you start tuning the exposure related settings, please note that each Exposure mode contains
different congurable features. The options are shown below:
Exposure modes Configurable features
Auto > Back light compensation
Shutter Priority > Exposure time
Iris Priority > Iris adjustment
Manual > Exposure time
> Iris adjustment
> Gain control
Exposure control:
Exposure level: You can manually set the Exposure level, which ranges from -2.0 to +2.0 (dark to
bright)�
Automatic gain control: Selects the reasonable gain value to maintain a good picture. Note that the gain
level, lighting levels and picture performance are closely related�
Exposure mode: Select Auto, Shutter Priority, Iris Priority, or Manual mode according to your needs�
For example, if the camera aims to monitor fast moving objects such as trafc control, you might utilize
the Shutter Priority mode� Then, tune the slide bar to set the Exposure time and Gain Control to the
best image quality
Auto Mode:
- Back Light Compensation (only available with the Auto mode): This option will automatically adjust the
display of images according to the brightness of an object which is at the center of a camera’s focus�
If you select the Auto mode, the Exposure time and Iris adjustment will be not congurable since the
sensor library will automatically adjust the value according to the ambient light�
Shutter Priority:
- Exposure time: The Exposure time setting allows tuning for more or less light into the lens. The
congurable value ranges from 1/10000 to the longest 1/1 second. An optimum shutter speed should
be maintained as long as the light level of the scene permits�
Iris Priority:
- Iris adjustment: The value is measured in the F-number as the ratio of the focal length to the lens
diameter� Iris size is inversely proportional to the F-number; therefore, the smaller the F-number, the
greater is the exposure ratio� Smaller F-number (larger exposure ratio, largest size of lens aperture
opening) is shown on the right of the slide bar
Manual: (the Manual mode enables access to the congurable features above)
- Exposure time: see above for description.
- Iris Adjustment: see above for description.
72


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Vivotek SD8322E Dome Quick start guide - English - 9 pages

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