User guide

Page 22 Document No: 11294 LBA-USB User Guide
2.1.7 Generate Gain
Generate Gain initiates an automatic Gain Correction calculation cycle. The
cycle generates results stored in a gain correction table that will then be used to
preprocess all data frames newly acquired from the camera.
The gain correction enunciator
is located at the bottom of the LBA-USB’s
main display screen. If the color of the gain correction enunciator is:
GRAY The gain correction processing is turned OFF.
GREEN The gain correction calculation succeeded and is operating.
RED The gain correction processing has been disabled due to a change in
the camera settings (brightness, gain, shutter, frame size/ROI, or bits
per pixel) since the gain frame was first captured.
How to Generate Gain
Before selecting Generate Gain perform the following:
 Allow the camera to warm up to a normal operating temperature.
 Align the laser beam with the camera and set the correct settings for Zoom, Pan
Camera type, resolution, etc.
 Block all light from the detector and perform an Ultracal!.
 Uniformly illuminate the camera detector to an intensity level that is between
60% and 90% of saturation.
Next, select Generate Gain from the File menu:
 After a few seconds, observe that the Gain Correction enunciator turns green.
 Remove the uniform illumination and re-apply the laser beam to the camera.
Note: Perform a Save Config... and a Save Gain As... operation in conjunction with
each Generate Gain... operation. This will ensure that when configuration
settings are restored, the configuration will allow the gain correction to operate
correctly.
What is Gain Correction?
The gain correction algorithm computes a mean pixel intensity value, and then
supplies a correction factor for each pixel that will adjust it to the computed
mean. If your camera has dead or seriously defective elements, do not attempt
to use or operate the camera with Gain Correction.