Due to the limitations of device materials and manufacturing processes, there are some differences between the detection units on the same focal plane array, resulting in obvious non-uniformity in the infrared image.
In addition, the non-uniformity of the infrared image is greatly affected by the changes of the image scene. In the uncooled infrared imaging system, it is also affected by the temperature changes of the infrared focal plane array, which seriously reduces the imaging quality of the infrared system.
Non-uniformity correction (NUC) is to adjust for small detector drift that occurs when the scene and environment change. Under normal circumstances, the thermal camera’ s own heat will interfere with its temperature readings.
At the initial startup, the thermal camera will frequently execute NUC.
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