Tomographic implementation of astronomical speckle imaging from bispectra

Details Tomographic implementation of astronomical speckle imaging from bispectra Tomographic implementation of astronomical speckle imaging from bispectra

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011optrv..18...19k&link_type=abstract

Optical Review, Volume 18, Issue 1, pp.19-26

Statistics

Computation

Astronomical Speckle Imaging, Bispectrum, Block-Building Method, Projection, Tomographic Reconstruction

Scientific paper

A bispectral method for astronomical speckle imaging utilizes an average speckle bispectrum of an object to derive its Fourier phase. There has been, however, a problem in conventional bispectral algorithm owing to difficulty in processing bispectral data in a four-dimensional (4D) space. In this paper, we propose an implementation to overcome this problem, where a one-dimensional (1D) object projection is reconstructed from a two-dimensional (2D) average bispectrum of speckle projections, and object projections so obtained at various angles are then tomographically combined into a 2D object image. In this tomographic approach, processes are separable into those for individual projection angles, implying that bispectral data required to be stored at a time are from 4D to 2D and computation time can be substantially reduced by parallelizing angle-by-angle processes. We have performed experiments using simulated and observed data, and have demonstrated the feasibility of the present approach with an achievable accuracy comparable to that of a conventional approach.

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