Free Access
Astron. Astrophys. Suppl. Ser.
Volume 144, Number 1, May II 2000
Page(s) 181 - 186
Published online 15 May 2000
DOI: 10.1051/aas:2000203

Astron. Astrophys. Suppl. Ser. 144, 181-186

Application of the OS-EM method to the restoration of LBT images

M. Bertero1 - P. Boccacci2

Send offprint request: M. Bertero,

1 - INFM and DISI, Universitá di Genova, Via Dodecaneso 35, I-16146 Genova, Italy
2 - INFM and DIFI, Universitá di Genova, Via Dodecaneso 33, I-16146 Genova, Italy

Received October 13, 1999; accepted February 17, 2000


The Large Binocular Telescope (LBT), which will be available in a few years from now, has been designed for high-resolution optical/infrared imaging through coherent cophasing of the two mirrors. The structure of the process of image formation in LBT is similar to that in Computed Tomography (CT) so that it is interesting to investigate the applicability to LBT of image restoration methods developed for CT. A powerful one is the so-called Expectation Maximization (EM), which is also known in the astronomical literature as Lucy-Richardson (LR) method. However slow convergence is a drawback of this method. In the case of CT an accelerated version, based on ordered subsets of projection data (OS-EM), has been proposed. In this paper we adapt OS-EM to the problem of restoring LBT images and we show that it provides an acceleration by a factor which is roughly equal to the number of independent interferometric images of the same object.

Key words: image processing, data analysis

SIMBAD Objects

Copyright The European Southern Observatory (ESO)

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.