Nano-5G Series GigE Vision Camera
Operational Reference
•
59
Auto-Brightness
Algorithm Source
autoBrightnessAlgoSource
Specifies the source location of the Auto-Brightness
algorithm.
1.00
Invisible
DFNC
Local
Local The auto-brightness algorithm runs in the camera.
Ethernet
Host The auto-brightness algorithm runs on a host
machine via the Ethernet connection.
Using Auto-Brightness
The Auto-Brightness features are designed to maintain consistent brightness (or image intensity) in
situations where lighting varies. These features benefit from being optimized for each applications
lighting. The information below describes making these adjustments and the feature
interdependencies. All feature example settings and acquisitions examples below are made using
the Sapera CamExpert tool.
Important:
Setup is critical. The Auto-Brightness algorithm cannot converge unless control
features are set properly (as required by the imaging situation). The following cases describe
simple setups and the control feature considerations required to make them work.
General Preparation
•
Before using any controls, a simple setup for experimentation is to have a reasonable free
running acquisition of n-frames per second (
AcquisitionFrameRate
) and an exposure time
(
ExposureTime
) that provides a viewable image.
•
Take note of the frame rate and exposure time. If the frame rate is very slow due to a long
exposure, add analog gain (
GainSelector
and
Gain
) and adjust the exposure time again.
•
Enable all Auto-Brightness features by setting
autoBrightnessMode
to active (live acquisition
must be off). This master feature only activates the auto-brightness, auto-exposure, and auto-
gain controls but doesn’t enable the processing.
•
The features
autoBrightnessSequence
,
autoBrightnessTargetSource
,
autoBrightnessTarget
,
autoBrightnessTargetRangeVariation,
and
autoBrightnessAlgorithm
can remain at their default
settings for this demo.
•
Note that the
Auto-Brightness
function is not available if
“
Cycling Mode
”
is active.
The Auto-Brightness examples below are summarized as follows:
•
Auto-Brightness by Frame Luminance Averaging
•
Auto-Brightness by Adjusting a Digital Gain
•
Auto-Brightness by Adjusting both Gain and Exposure
Auto-Brightness with Frame Luminance Averaging
After the preparations described above, the Auto-Exposure function is tested as follows. These
setup steps are made before doing a live acquisition.
•
Set the
autoBrightnessAlgoConvergenceTime
to a larger value than the default 2 seconds if
more time is required to ensure adequate time for convergence.
•
Set
ExposureAuto
to Continuous to activate all Auto-exposure features.
•
Referring to the
ExposureTime
value used to get a viewable image during the free-running
preparation stage, set
exposureAutoMaxValue
to a maximum exposure time longer than was
needed. This maximum exposure limit feature may be required in imaging situations where the
frame rate must not be forced below some minimum value. Also check that
exposureAutoMinValue
is low enough to allow the auto exposure a wide range to function in
(but not too low else the algorithm will undershoot).
•
Enable live acquisition (Grab button in CamExpert). The image exposure will adjust itself until
the
autoBrightnessTarget
value is achieved. During live acquisition, the
autoBrightnessTarget
value can be changed to observe the algorithm converge to the new luminance value.
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