Abstract:
Speckle Imaging based on triple correlation is
a very efficient image reconstruction technique which is
used to retrieve Fourier phase information of the object
in presence of atmospheric turbulence. We have developed
both Direct Bispectrum and Radon transform based Tomographic speckle masking algorithms to retrieve atmospherically distorted astronomical images. The latter is a much
computationally efficient technique because it works with
one dimensional image projections. Tomographic speckle
imaging provides good image recovery like direct bispectrum but with a large improvement in computational time
and memory requirements. The algorithms were compared
with speckle simulations of aperture masking interferometry with 17 sub-apertures using different objects. The results
of the computationally efficient tomographic technique with
laboratory and real astronomical speckle images are also
discussed.
