Sigma LBA-700, LBA-710, LBA-714PC Generate Gain, How to generate gain, What is Gain Correction?

3.1.7Generate Gain

Clicking this item will cause the LBA-PC to execute an automatic Gain Correction calculation cycle. The results of this operation will store a gain correction table that will be used to preprocess all data frames newly acquired from the Frame Grabber card.

The status of the Gain Correction condition is visible in the Gain correction Enunciator shown here and at the bottom of the LBA-PC’s main display screen.

If the color of the Gain Correction Enunciator is: GRAY Gain Correction processing is turned OFF.

GREENThe Gain Correction calculation was successful and is OPERATING.

RED Gain Correction processing has been disabled because something caused the usage of it to become invalid.

3.1.7.1How to generate gain

Before clicking on the Generate Gain... item you must:

•Allow the camera to warm up to a normal operating temperature.

•Align your laser beam with the camera and set the correct Zoom, Pan Camera type and resolution, etc. settings.

•Block all light from the detector and perform an Ultracal!.

•Uniformly illuminate the camera detector to an intensity level that is about 60% to 90% of saturation.

Now click File, Generate Gain.

•After a few seconds.. observe that the Gain Correction enunciator turns Green.

•Remove the uniform illumination and re-apply your laser beam to the camera.

Note: It is highly recommended that you perform a Save Config... and a Save Gain As... operation in conjunction with each Generate Gain... operation. This will insure that you can restore the settings to the configuration that will allow the Gain Correction to operate correctly.

3.1.7.2What is Gain Correction?

The gain correction algorithm will compute a mean pixel intensity value, and then supply a correction factor for each pixel that will correct it to the computed mean. If your camera has dead or seriously defective elements you should not attempt to use or operate with Gain Correction.

3.1.7.3What Disables Gain Correction?

Gain Correction will become DISABLED if certain data collection conditions, that were in effect when the Generate Gain operation was executed, are no longer in effect. In all cases, these conditions are the result of an operators change to the spatial acquisition settings. The DISABLED condition will occur if you make changes to:

Operator’s Manual 38 LBA-PC