On this tab, you can set parameters for automatically adjusting the exposure time and sensor gain of your uEye camera (see also Automatic image control).
Fig. 124: uEye properties - AES/AGC
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Image contrast
Use the following settings to configure automatic brightness control:
•Exposure (AES)
Enables automatic adjustment of image brightness, i.e. the exposure time is automatically adjusted to achieve the preset brightness reference value.
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•Framerate (AFR)
Enables the framerate control. This option is only available when AES is active.
If the maximum exposure time is not sufficient for a brighter image, you can use AFR to reduce the frame rate and so extend the exposure time.
•Gain (AGC)
Enables the automatic gain, i.e. the control automatically adjusts the gain to achieve the set brightness reference value.
•Run once
The control is switched off automatically if the specified target value is reached or nearly reached, and the set value does not change after three measurements.
•Use sensor's auto features
This option enables on some sensors the internal brightness adjustment.
•Brightness reference
Defines the target value which should be set.
Under normal conditions, a reference value of 128 is sufficient.
•Exposure limit
Sets the upper limit for the exposure time. This upper limit is not exceeded if AES is enabled. If AES and AFR is enabled then the upper limit is ignored.
•Gain limit
Sets the maximum gain limit. This upper limit is not exceeded when AGC is enabled.
•Speed
Sets the adjustment speed. The higher the speed control is set, the faster the adjustment is. Setting the speed control to 0 disables the adjustment functionality. If the value is set to high the adjustment starts to oscillate. In this case you have to reduce the adjustment speed.
•Hysteresis
Defines the difference by which the actual value can differ from the target value. If the target value is set e.g. to 128 and the hysteresis is set to 2, so there will be no regulation as long as the actual value is between 126 and 130 (see also Automatic image control: Hysteresis).
If the value for hysteresis is too small, the adjustment starts to oscillate. It is recommended to keep the standard value of 2.
•Skip frames
Number of frames that will be skipped during automatic image control when freerun mode is active (see also Automatic image control: Control speed). The higher the frame rate, the higher the value should be. If the value is too small, the adjustment may starts to oscillate, or there is an overload of the system. In this case increase the value.
Histogram area
The histogram area specifies which area of the image will be used for calculating the average grayscale value of the image.
You can set the size of the histogram area by using the tools on the toolbar.
Default
Click this button to reset all parameters to the model-specific defaults.
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