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Proceedings Paper

Phase-Gradient Speckle-Image Reconstruction: Discrete-Photon Case
Author(s): G. J.M. Aitken; R. Johnson
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Paper Abstract

The phase-gradient algorithm (PG) determines the phase of a stellar object's spatial spectrum by estimating the derivatives of the phase directly from the speckle images, and then integrating. A photon-address version of the PG has been successfully implemented for use at very low light levels. Computation of image-domain, cross-correlation functions is simply a matter of generating the 2D histograms of address differences, and bias terms are eliminated by omitting all photon self-correlation products. In a series of comparisons with a photon-address, Knox-Thompson algorithm, PG proved to have greater computational efficiency, to be more robust and to yield images with lower noise.

Paper Details

Date Published: 29 January 1988
PDF: 7 pages
Proc. SPIE 0828, Digital Image Recovery and Synthesis, (29 January 1988); doi: 10.1117/12.942078
Show Author Affiliations
G. J.M. Aitken, Queen's University (Canada)
R. Johnson, Queen's University (Canada)

Published in SPIE Proceedings Vol. 0828:
Digital Image Recovery and Synthesis
Paul S. Idell, Editor(s)

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