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Achieving a good image15
15.7 Calibrating the camera
15.7.1 General
Calibration of the camera is performed as a non-uniformity correction (NUC). An NUC is
an image correction carried out by the camera software to compensate for different sensi-
tivities of detector elements and other optical and geometrical disturbances
1
.
Calibration is needed whenever the output image becomes spatially noisy. The output can
become spatially noisy when the ambient temperature changes (such as from day to night
operation, and vice versa).
The calibration is carried out automatically when needed. It is also possible to perform a
calibration manually.
While the calibration is in progress, the text Calibrating... is displayed.
15.7.2 Manual calibration
You may, for example, want to perform a manual calibration just before you start recording
a video sequence.
15.7.2.1 Procedure
Follow this procedure:
1. To perform a manual calibration, push and hold down the Image archive button
for more than 2 seconds.
Note You can also assign the function Calibrate to one of the programmable buttons. Se-
lect
(Settings) > Programmable buttons .
15.8 Hiding all overlay
15.8.1 General
The camera overlay consists of overlay graphics and image overlay information. The over-
lay graphics include items such as measurement tool symbols, result tables, and status
icons. The image overlay information, which you activate on the Settings menu, provides
additional information such as the date, emissivity, and atmospheric temperature.
You can choose to hide all camera overlay by the press of a programmable button.
Image with camera overlay and image overlay
information.
Image with all overlay hidden.
#T559954; r. AL/37426/37426; en-US
58
1. Definition from the impending international adoption of DIN 54190-3 (Non-destructive testing Thermographic
testing Part 3: Terms and definitions).
72


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