Example 2; Performing A Non-Uniformity Correction (Nuc); Changing The Temperature Scale Level - FLIR Exx Series User Manual

13 Working with images

13.3.3 Example 2

This figure shows two infrared images of an isolator in a power line.
In the left image, the cold sky and the power line structure are recorded at a minimum
temperature of –26.0°C (–14.8°F). In the right image, the maximum and minimum tem-
perature levels have been changed to temperature levels near the isolator. This makes it
easier to analyze the temperature variations in the isolator.

13.3.4 Performing a non-uniformity correction (NUC)

13.3.4.1 What is a non-uniformity correction?
A non-uniformity correction is an image correction carried out by the camera software to
compensate for different sensitivities of detector elements and other optical and geomet-
rical disturbances 1 .
13.3.4.2 When to perform a non-uniformity correction?
The non-uniformity correction process should be carried out whenever the output image
becomes spatially noisy. The output can become spatially noisy when the ambient tem-
perature changes (such as from day to night operation, and vice versa).
13.3.4.3 Procedure
To perform a non-uniformity correction, push and hold the Image archive button for
more than 2 seconds.

13.3.5 Changing the temperature scale level

Follow this procedure:
1. Push the navigation pad to display the menu system.
2. Use the navigation pad to go to Temperature scale.
3. Push the navigation pad.
4. Select Manual and push the navigation pad.
5. Push the navigation pad left/right to select Max + Min.
1. Definition from the impending international adoption of DIN 54190-3 (Non-destructive testing – Thermographic
testing – Part 3: Terms and definitions).
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