Phase errors in near-axis bispectral stellar image reconstruction

Meng, Julian; Aitken, George J. M.

doi:10.1364/josaa.11.001736

Cited by 4 publications

(2 citation statements)

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“…The KTF is (S(Af)S*(0)), a phasor which has a nonzero phase variance. These results are supported by calculations of the phase variances in both cases (Meng 1993;Meng and Aitken 1994). The method used by Von der Lühe (1988) to calculate the KT phase variances was extended to the TC bispectrum as described by Meng (1993).…”

Section: Dynamic Rangementioning

confidence: 71%

“…This phenomenon, which usually has a negligible effect in conventional imaging, is quite pronounced in speckle-image reconstruction from higher-order spectra. Second, it has recently been found that at high signal-to-noise ratios TC has a higher dynamic range than KT (Meng and Aitken 1994). This means that phase derived from the TC bispectrum has a lower error than phase derived from the KT bispectrum.…”

Section: Introductionmentioning

confidence: 99%

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Bispectral stellar image reconstruction: Image truncation, dynamic range, and object complexity

Aitken

Johnson

Meng

1995

PASP

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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 dynamic range, an important property when observing detail. In both cases, the amount of improvement in image quality obtained by using additional bispectral planes increases with object complexity. Examples illustrate these properties.

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Section: Dynamic Rangementioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%