A study has been made of a Gram–Charlier
matched filter for Shack–Hartmann sensing
of wavefront 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 subaperture/coherence 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
Equations on this page are rendered with MathJax. Learn more.