What is the function of a Flat Field Correction (FFC)?

• A. Corrects minor detector drift that occurs as scene and environment change.
• B. Adjusts color balance across the image
• C. Removes noise by averaging frames
• D. Synchronizes frame rate with the processor

Answer: (A)

Flat Field Correction is about keeping the image uniformly bright and free of detector-induced shading by correcting for pixel-to-pixel differences in the detector’s response. Each pixel in an infrared detector can respond a bit differently, and those responses drift as temperature and scene conditions change. FFC uses a reference, typically a near-uniform input, to adjust the gain and offset of each detector element so that a uniform scene looks uniform in the output. This keeps the image consistent as the scene or environment shifts, preventing false temperature differences from being introduced by the detector itself. It’s not about color balance, frame averaging to reduce noise, or matching frame rates—those are separate functions.