Phase-gradient stellar image reconstruction

Details Phase-gradient stellar image reconstruction Phase-gradient stellar image reconstruction

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986optco..56..379a&link_type=abstract

Optics Communications (ISSN 0030-4018), vol. 56, Jan. 15, 1986, p. 379-383. NSERC-supported research.

Physics

Optics

9

Astrometry, Image Reconstruction, Algorithms, Atmospheric Turbulence, Bias, Computerized Simulation, Fourier Transformation, Phase Deviation, Speckle Patterns

Scientific paper

An algorithm is presented for the direct measurement of the phase gradient of an object's spatial-frequency spectrum from stellar speckle images. The process is based on the differentiation properties of Fourier transforms. Bias terms inherent to the process at low light levels depend on object asymmetry and can be expected to be less important with most objects than is the case with other phase estimation processes. Results of a computer simulation and a noise analysis are given .

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