Vivotek SD8322E User Manual download pdf (Page 72)

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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.

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Vivotek SD8322E User Manual Page 72