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29 January 1988 Phase-Gradient Speckle-Image Reconstruction: Discrete-Photon Case
G. J.M. Aitken, R. Johnson
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Proceedings Volume 0828, Digital Image Recovery and Synthesis; (1988) https://doi.org/10.1117/12.942078
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States
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.
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G. J.M. Aitken and R. Johnson "Phase-Gradient Speckle-Image Reconstruction: Discrete-Photon Case", Proc. SPIE 0828, Digital Image Recovery and Synthesis, (29 January 1988); https://doi.org/10.1117/12.942078
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KEYWORDS
Speckle
Neptunium
Image processing
Reconstruction algorithms
Algorithm development
Error analysis
Image restoration
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