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1 January 1987 Direct Phase-Gradient Estimation For Stellar Speckle-Image Reconstruction
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Proceedings Volume 0813, Optics and the Information Age; (1987)
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada
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.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. J .M. Aitken and R. Johnson "Direct Phase-Gradient Estimation For Stellar Speckle-Image Reconstruction", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987);

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