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Proceedings Paper

Direct Phase-Gradient Estimation For Stellar Speckle-Image Reconstruction
Author(s): G. J .M. Aitken; R. Johnson
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Paper Abstract

The primary problem in reconstructing diffraction-limited stellar images from their measured spatial spectra has been the accurate determination of phase. Modulus is readily obtained by means of the speckle-interferometric processing [1,2] of a large number of short-exposure speckle images. While the severity of atmospheric perturbations precludes the direct measurement of phase, the gradient of the phase can be accurately estimated, and then integrated to obtain the phase. The Knox-Thompson (KT) algorithm [3] approximates the phase gradient by computing the 2-D array of phase differences between adjacent spatial-frequency components. The phase-gradient (PG) process [4] described here determines the true phase gradient directly from the series of speckle images, and gives better performance than the KT process at low light levels.

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967164
Show Author Affiliations
G. J .M. Aitken, Queen's University (Canada)
R. Johnson, Queen's University (Canada)


Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age

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