Physics – Optics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987josaa...4..438f&link_type=abstract
Optical Society of America, Journal, A: Optics and Image Science (ISSN 0740-3232), vol. 4, March 1987, p. 438-448. DRET-supporte
Physics
Optics
7
Atmospheric Turbulence, Image Reconstruction, Speckle Interferometry, Telescopes, Turbulence Effects, Atmospheric Optics, Fourier Transformation, Image Processing, Phase Deviation, Photons
Scientific paper
Turbulence degraded images can be restored by using the Knox-Thompson algorithm (1974). This algorithm is briefly described, and its photon-noise limitations are discussed. Peculiar difficulties related to the phase dislocations in the Fourier space are pointed out, and a solution to this problem is proposed. This algorithm does not require more photons than the speckle-interferometry technique and could provide much more information on complex astronomical objects. To illustrate these phase dislocations and signal-to-noise ratio problems, different restorations are presented that result from degraded images obtained with a turbulence-simulation facility and from astronomical data.
Fontanella Jean-Claude
Seve Alain
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