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Reference.org
Flat-field correction
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<p>Flat-field correction (FFC) is a <a href="/facts/Digital_imaging/nTNga50f">digital imaging</a> technique to mitigate pixel-to-pixel differences in the <a href="/facts/Photodetector/7cSkXS6s">photodetector</a> sensitivity and distortions in the <a href="/facts/Optical_path/tXu2qmnN">optical path</a>. It is a standard calibration procedure in everything from personal <a href="/facts/Digital_camera/LSGTserm">digital cameras</a> to large telescopes. </p>