Phase and image reconstruction from interferometric imaging: Integration of the phasors.

Details Phase and image reconstruction from interferometric imaging: Integration of the phasors. Phase and image reconstruction from interferometric imaging: Integration of the phasors.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..112..163a&link_type=abstract

Astronomy and Astrophysics Supplement, v.112, p.163

Astronomy and Astrophysics

Astrophysics

Atmospheric Effects, Methods: Data Analysis, Methods: Numerical, Techniques: Image Processing, Techniques: Interferometric

Scientific paper

We present a new approach of a phase recovery method derived from the Knox-Thompson one, and used to reconstruct images blurred by the atmospheric turbulence. We rebuild the phase of the visibility whose main value contains discontinuities due to random phase shifts induced by the turbulence. The method presented in this paper is an upgrade of the one described by Monin et al. (1992) who computed the average of spatial phase gradients. We now work on integration of the phasors gradients exp(i∇φ), computing the average phasor components of the cross-spectrum of the visibility to reconstruct the original phase. We discuss the implied hypothesis and the advantage of our new approach. We present results on simulated images which visibility phases have been distorted using a model of atmospheric perturbed wavefronts, as well as an application on real speckle data.

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