Astronomical imaging by filtered weighted-shift-and-add technique

Details Astronomical imaging by filtered weighted-shift-and-add technique Astronomical imaging by filtered weighted-shift-and-add technique

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986josaa...3.2069r&link_type=abstract

Optical Society of America, Journal, A: Optics and Image Science (ISSN 0740-3232), vol. 3, Dec. 1986, p. 2069-2076.

Physics

Optics

17

Astronomical Photometry, Imaging Techniques, Matched Filters, Speckle Interferometry, Astronomical Maps, Binary Stars, Point Spread Functions, Wiener Filtering

Scientific paper

The weighted-shift-and-add speckle imaging technique is analyzed using simple assumptions. The end product is shown to be a convolution of the object with a typical point-spread function (psf) that is similar in shape to the telescope psf and depends marginally on the speckle psf. A filter can be applied to each data frame before locating the maxima, either to identify the speckle locations (matched filter) or to estimate the instantaneous atmospheric psf (Wiener filter). Preliminary results show the power of the technique when applied to photon-limited data and to extended objects.

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