Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101..471a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, May 1989, p. 471-488. Research supported by NSERC
Astronomy and Astrophysics
Astronomy
2
Diffraction Limited Cameras, Image Processing, Image Resolution, Seeing (Astronomy), Space Observations (From Earth), Stellar Spectra, Atmospheric Turbulence, Numerical Differentiation, Speckle Interferometry
Scientific paper
Algorithms and computational developments in recent years have yielded suitable techniques for overcoming the resolution limits imposed on conventional astronomical observations by atmospheric turbulence. The Knox-Thompson, triple-correlation, and phase-gradient algorithms are capable of reconstructing the diffraction-limited, complex spatial spectrum of an object from a sequence of short-exposure images. The basic principles of these techniques are reviewed with emphasis on photon-limited operation at visible wavelengths. Practical considerations, magnitude limits, and examples of recent applications are presented.
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