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1 January 1981 Subtleties In The Flat-Fielding Of Charge-Coupled Device (CCD) Images
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Astronomical photometry with CCDs will often involve relatively low signal levels--less than 1000 charge carriers per pixel--at which non-linear effects sometimes become significant. These effects, which have already been troublesome to us in attempting accurate photometry of faint objects with ground-based telescopes, will doubtless play a role in the processing of Space Telescope data. The problem evidently arises because signal charges are not read out equally completely from all columns and all pixels. Although a first-order correction can be made by subtracting a low-level flat field from all frames before conventional processing, higher accuracy can be achieved by modeling the response with a non-linear function.
© (1981) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William A. Baum, Bjarne Thomsen, and Tobias J. Kreidl "Subtleties In The Flat-Fielding Of Charge-Coupled Device (CCD) Images", Proc. SPIE 0290, Solid-State Imagers for Astronomy, (1 January 1981);

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