Physics – Optics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasp..107...77a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 107, no. 707, p. 77-84
Physics
Optics
Adaptive Optics, Image Analysis, Image Reconstruction, Optical Correction Procedure, Seeing (Astronomy), Speckle Patterns, Stellar Spectra, Algorithms, Atmospheric Turbulence, Dynamic Range, Edge Detection, Truncation Errors
Scientific paper
Truncation of the speckle cloud by the edges of an image detector causes significant artifacts and distortions in images reconstructed from their second- and third-order spectra such as the Knox-Thompson (KT) and triple-correlation (TC) bispectra. At high signal levels the near-axis, TC transfer function has a lower phase variance than the KT transfer function. This gives TC a higher function. This gives TC a higher dynamic range, an important property when observing detail. In both cases, the amount of improvment in image quality obtained by using additional bispectral planes increases with object complexity. Examples illustrate these properties.
Aitken George J. M.
Johnson Rachael
Meng Jie
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