Improved convergence for CCD gain calibration using simultaneous-overrelaxation techniques

R. M. Toussaint, J. W. Harvey, William D Toussaint

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Simple modifications to the analysis used in the Kuhn, Lin, & Loranz flat-field CCD calibration method yield significant improvements in both speed and accuracy. In this method, multiple exposures are taken of a time-independent signal at different spatial positions. The flat field is then expressed in the form of a Jacobi relaxation solution to Poisson's equation. By applying the technique of simultaneous overrelaxation, we have improved the convergence rate to require approximately the square root of the number of iterations (√r) needed by the Jacobi method. For large arrays, where r is correspondingly large, this improvement is significant. Furthermore, we have improved the accuracy by extending the method to account for fractional pixel shifts.

Original languageEnglish (US)
Pages (from-to)1112-1118
Number of pages7
JournalAstronomical Journal
Volume126
Issue number2 1772
DOIs
StatePublished - Aug 2003

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charge coupled devices
calibration
Poisson equation
iteration
pixels
shift
pixel
method

Keywords

  • Techniques: image processing

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Improved convergence for CCD gain calibration using simultaneous-overrelaxation techniques. / Toussaint, R. M.; Harvey, J. W.; Toussaint, William D.

In: Astronomical Journal, Vol. 126, No. 2 1772, 08.2003, p. 1112-1118.

Research output: Contribution to journalArticle

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