Tiger CCD Cameras with Camera Link
– User Manual
November 27, 2017
Page
59
of
86
Rev 1.0
3.8 AEC/AGC Control
Automatic exposure control (AEC) and automatic gain control (AGC) is available only on
ruggedized versions of the Tiger camera. It enables the ruggedized Tiger camera to
maintain the same image brightness under variable lighting conditions. The automatic
exposure and gain control process drives the exposure and gain to achieve a target
luminance level (in counts) specified in the Limit settings.
In addition to providing control functions, the AEC/AGC Control screen also provides real-
t
ime statistics on the camera’s exposure time, gain, and luminance values.
When the
camera’s
exposure or gain limit is reached, an indicator light on the screen changes color
from green to red.
Figure 49: AEC/AGC Control screen.
To use AEC and AGC controls:
1.
Select the check boxes for AEC Enable or AGC Enable.
2.
Select the luminance level the camera is to maintain in the image. Options are
Average and Peak:
•
Average
–
the camera calculates the average value of the image luminance
within the image and compares that value to the value entered in the Limit
field to determine changes to the exposure/gain settings.
•
Peak
–
the camera calculates the peak luminance value (maximum
luminance level) within the image and compares that value to the value
entered in the Limit field to determine changes to exposure/gain settings.
3.
Enter minimum and maximum Exposure Limits. For example, if motion capture is
important, you can specify a short maximum exposure to avoid motion blur.
Exposure Limits range from 10 microseconds to a maximum limit determined by
operation mode. Generally, the minimum exposure limit should be set to a
minimum of 30 microseconds to avoid control loop oscillations when the scene
illumination changes suddenly.
4.
Enter minimum and maximum Gain Limits. Gain Limits range from Min: 0 dB to
Max: 30 dB.
