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Optics Letters

Optics Letters


  • Vol. 23, Iss. 4 — Feb. 15, 1998
  • pp: 235–237

Gram-Charlier matched filter for Shack-Hartmann sensing at low light levels

J.-M. Ruggiu, C. J. Solomon, and G. Loos  »View Author Affiliations

Optics Letters, Vol. 23, Issue 4, pp. 235-237 (1998)

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A study has been made of a Gram-Charlier matched filter for Shack-Hartmann sensing of wave-front slopes. The method is based on modeling the point-spread function by an expansion in terms of Gauss-Hermite polynomials. We present results for several subapertureycoherence area sizes both with and without CCD read noise. A more accurate estimation of the local slopes can be achieved at low light levels in this way than with the standard first-moment estimator.

© 1998 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(040.3780) Detectors : Low light level
(010.1030) Atmospheric and oceanic optics : Absorption

J.-M. Ruggiu, C. J. Solomon, and G. Loos, "Gram-Charlier matched filter for Shack-Hartmann sensing at low light levels," Opt. Lett. 23, 235-237 (1998)

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