Dalsa C1240, User Manual

Page: 136 / 327

126 • Operational Reference Nano Series GigE Vision Camera
Auto-Exposure Time Min
Value
exposureAutoMinValue Sets the minimum exposure time value allowed
by the user, in microseconds, for the Auto-
Exposure function.
1.04
Expert
DFNC
Auto-Exposure Time
Max Value
exposureAutoMaxValue Sets the maximum exposure time value allowed
by the user, in microseconds, for the Auto-
Exposure function.
1.04
Expert
DFNC
Automatic Gain Control GainAuto Controls the state of the automatic gain control. 1.04
Expert
Off Off Gain is manually controlled using the Gain
feature.
Continuous Continuous Gain is constantly adjusted by the camera to
meet the auto-brightness target pixel value. The
initial starting gain can be set by setting GainAuto
to Off, changing the gain value and then setting it
back to Continuous.
Auto-Gain Source gainAutoSource Selects the gain to control. 1.06
Expert
Digital DigitalAll Digital
Sensor SensorAll Sensor (available in some models)
Auto-Gain Max Value gainAutoMaxValue Sets the maximum gain multiplier value for the
automatic gain algorithm. The automatic gain
function is an amplification factor applied to the
video signal to obtain the auto-brightness target
value.
1.04
Expert
DFNC
Auto-Gain Min Value gainAutoMinValue Sets the minimum gain multiplier value for the
automatic gain algorithm. The automatic gain
function is an amplification factor applied to the
video signal to obtain the auto-brightness target
value.
1.04
Expert
DFNC
Auto-Brightness
Algorithm Source
autoBrightnessAlgoSource Specifies the source location of the Auto-
Brightness algorithm.
1.04
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.