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.
Phase-Gradient Speckle-Image Reconstruction: Discrete-Photon Case
Digital Image Recovery and Synthesis ; 1986 ; San Diego,CA,United States
Proc. SPIE ; 0828
1988-01-29
Conference paper
Electronic Resource
English
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