OPERATING AND USER MANUAL OPAL FAMILY
70
OPTION: AEC/VEM
The detection value of the AEC mechanisms is the weighted average within a defined window of the
grey value (monochrome cameras, default the weighing factor is 1) or the weighted average of the red,
green and blue information (red + green + blue = 1).
AIC acts at sensor level. Ton and Toff in figure 1 are internal timing signals which determine the
integration period of the sensor. This timing is the result of the algorithm using the Frame Period (FP),
the measured average video level from sensor (AEC_mean) and the Auto Exposure Setpoint.
AGC will act if the Auto Exposure Setpoint cannot be matched by the AIC due to low light conditions.
In this case, the integration time is at maximum with regards to AICmax and FP.
This figure indicates the operation of the AEC control loop
Figure 10.2:
The speed factor of both AIC and AGC controls can be set by user command.
VEM
10.2.2.
This function optimizes contrast for the whole image based on real-time measurements made on
a predefined part of the image, referred to as detector window or Area Of Interest (AOI). Contrast
optimization is done by applying gain and offset in order to have pre-defined maximum and minimum
video levels in the AOI. The part of the image that is outside the AOI will also be optimized but will not
contribute to the real time measurements. These parts may therefore remain over- or underexposed.
This figure indicates the operation of the VEM control loop
Figure 10.3:
VEM allows for contrast enhancement by video level measurements within a defined window. The
operation and its limits can be configured by commands.
Scene light level
AIC control
AGC control
Maximum IT
Minimum GA
Maximum GA
Minimum IT
Auto Exposure SetPoint
GA acts as fine adjust
AEC status: IT = maximum, GA >minimum
Summary of Contents for Camera Link OPAL Series
Page 1: ...Operating and user manual OPAL FAMILY CAMERA LINK MODELS ...
Page 2: ...OPERATING AND USER MANUAL OPAL FAMILY 2 ...
Page 9: ...OPERATING AND USER MANUAL OPAL FAMILY 9 ...
Page 10: ...OPERATING AND USER MANUAL OPAL FAMILY 10 ...
Page 14: ...OPERATING AND USER MANUAL OPAL FAMILY 14 SAFETY INFORMATION ...
Page 22: ...OPERATING AND USER MANUAL OPAL FAMILY 22 ...
Page 30: ...OPERATING AND USER MANUAL OPAL FAMILY 30 ...
Page 34: ...OPERATING AND USER MANUAL OPAL FAMILY 34 ...
Page 86: ...OPERATING AND USER MANUAL OPAL FAMILY 86 REVISION HISTORY ...