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Proceedings Paper

Image reconstruction from the bispectrum using an iterative algorithm and applications of the method to astronomical objects
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Paper Abstract

The atmosphere of the earth restricts the resolution of conventional astrophotography to " 1 arcsec. Much higher resolution can be obtained by interferometric speckle techniques. Bispectrum analysis'3 (also called speckle masking) of many speckle interferograms (short-exposure photographs; exposure time ,,o.o5 sec) yields diffraction-limited images with, for example, 0.02 arcsec resolution for a 5-rn telescope. After the first processing steps of speckle masking the object bispectrurn o()(u,v) is obtained up to the cut-off frequency of the telescope. From the object bispectrum a diffraction-limited image of the object can be reconstructed (a) by using the conventional recursive method2 (the Fourier phase of the object is extracted recursively from O()(u,v) ) or (b) by using an iterative image reconstruction algorithm presented in this paper. The iterative algorithm searches for the high-resolution image which has the best agreement with the measured object bispectrum.

Paper Details

Date Published: 1 July 1990
PDF: 2 pages
Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.34797
Show Author Affiliations
Karl-Heinz Hofmann, Max-Planck-Institute for Radio (Germany)
Gerd Weigelt, Max-Planck-Institute for Radio (Germany)

Published in SPIE Proceedings Vol. 1319:
Optics in Complex Systems

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