You can set the exposure time as well as brightness, gain and black level either automatically or manually for the USB 3 uEye XC.

•Open the "Brightness and contrast" dialog via "Camera > Brightness and contrast" or click on in the toolbar.

Fig. 145: Brightness and contrast

Automatic control

1.Enable the "Automatic" option to activate the auto control for exposure time and gain.

2.Via the "Automatic mode" drop-down list you define whether both exposure and gain or only exposure or gain should be controlled automatically.

3.Set the value for the maximum exposure time via the "Exposure limit" slider. This upper limit is not exceeded in automatic mode.

4.Via the "Auto contrast correction" slider you can set if the image should be underexposed or overexposed. For this purpose, you pass a correction value in the unit EV (exposure value) to the camera. A positive EV makes the images brighter, a negative EV makes them darker. An EV of 1.0 or -1.0 means that image brightness is doubled or halved.
The auto contrast correction can have an effect on the exposure time, gain, or both.

Manual control

1.Enable the "Manual" option to set the exposure time and gain manually.

2.Set the exposure time via the "Exposure time" slider. The available exposure time range depends on the pixel clock setting and the frame rate. A low frame rate setting allows long exposure times. A high frame rate setting reduces the maximum possible exposure time.

3.Set the gain value for overall image brightness via the "Gain" slider. Master gain = 100 % means maximum gain. The maximum possible gain factor depends on the sensor model you are using, see Camera and sensor data.

Black level

Via the "Offset" slider you set the black level of the sensor signal. Only an additive offset is possible (increase of the black level).

The sensor adjusts the black level of the pixels automatically by default. If the environment is very bright, it can be necessary to adjust the black level manually. High gain may offset the black level.

Resetting the parameters

Click on the "Default" button to reset all parameters to the model-specific defaults.