Images from astronomical speckle data - Weighted shift-and-add analysis

Details Images from astronomical speckle data - Weighted shift-and-add analysis Images from astronomical speckle data - Weighted shift-and-add analysis

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986opten..25..724c&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 25, June 1986, p. 724-730.

Astronomy and Astrophysics

Astronomy

10

Astronomy, Image Analysis, Image Reconstruction, Interferometry, Speckle Patterns, Diffraction Limited Cameras, Matched Filters, Pixels, Signal To Noise Ratios, Supergiant Stars, Wiener Filtering

Scientific paper

A variant of the shift-and-add algorithm originally developed by Lynds, Worden, and Harvey (1976) to astronomical speckle interferometric data has been applied. A set of impulses corresponding in locations and magnitudes to the local maxima in each specklegram is generated and used to obtain an average speckle by means of a Wiener-type filter deconvolution procedure. This technique yields diffraction-limited images that appear to be self-calibrating for seeing effects. Realistic point spread functions have been obtained for a number of telescopes at different wavelengths, and results are also presented for the resolved red supergiant Alpha Orionis. The limiting signal-to-noise ratio of the technique as indicated by the results presented here suggests a dynamic range of about 6 stellar magnitudes, with no evidence of residual seeing effects. A matched filter technique is demonstrated for use in locating the speckles of complicated objects or for objects dominated by photon noise.

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