High-resolution reconstruction of photon limited stellar images using phase gradients

Details High-resolution reconstruction of photon limited stellar images using phase gradients High-resolution reconstruction of photon limited stellar images using phase gradients

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988cajph..66..847a&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 66, Oct. 1988, p. 847-853. Research supported by NSERC.

Physics

High Resolution, Image Processing, Speckle Interferometry, Stellar Spectra, Astronomical Photography, Atmospheric Turbulence, Phase Shift, Refractivity

Scientific paper

Phase-gradient and Knox-Thompson processes for determining the gradients of a stellar object's phase from speckle images are compared with respect to their behavior at low photon levels. The phase-gradient process is immune to the degrading effects of image wandering and image reentering, and is computationally simpler and faster than the Knox-Thompson process. Examples of reconstructions from simulated and real speckle images are presented.

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