Modified shift-and-add speckle imaging algorithm

Details Modified shift-and-add speckle imaging algorithm Modified shift-and-add speckle imaging algorithm

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990optl...15.1380g&link_type=abstract

Optics Letters (ISSN 0146-9592), vol. 15, Dec. 1, 1990, p. 1380-1382.

Mathematics

4

Algorithms, Astronomical Photometry, Computerized Simulation, Imaging Techniques, Speckle Patterns, Fourier Transformation, Ghosts, Image Processing, Refractivity, Robustness (Mathematics)

Scientific paper

A simple but powerful improvement of the shift-and-add method for the restoration of astronomical images is presented. In this modified algorithm, the shift vector and weight of a specklegram are estimated by computing the cross correlation between the specklegram and the current average before shifting the specklegram and updating the average. In this sense, all the information contained in the specklegram is used for maximizing the coherence during the averaging process. Numerical simulations indicate that the suggested modification widens the applicability of the shift-and-add method to extended objects without the appearance of ghost images.

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