Flat-field correction

The brightness variation due to vignetting, as shown here, can be corrected by selectively brightening the perimeter of the image.

Not to be confused with Petzval field curvature, which refers to focus uniformity.

Flat-field correction is a technique used to improve quality in digital imaging. The goal is to remove artifacts from 2-D images that are caused by variations in the pixel-to-pixel sensitivity of the detector and/or by distortions in the optical path. It is a standard calibration procedure in everything from pocket digital cameras to giant telescopes.

单词	Field flatness
释义	Field flatness 英语百科 Flat-field correction Not to be confused with Petzval field curvature, which refers to focus uniformity. Flat-field correction is a technique used to improve quality in digital imaging. The goal is to remove artifacts from 2-D images that are caused by variations in the pixel-to-pixel sensitivity of the detector and/or by distortions in the optical path. It is a standard calibration procedure in everything from pocket digital cameras to giant telescopes.
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Field flatness

Flat-field correction