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SUMMARY:Compressed Sensing Imaging Techniques for Radio Interferometry and
  Cosmic String Reconstruction - Yves Wiaux (EPFL\, Lausanne\, Switzerland)
DTSTART:20081216T163000Z
DTEND:20081216T173000Z
UID:TALK15266@talks.cam.ac.uk
CONTACT:Jane Buckle
DESCRIPTION:Radio interferometry probes astrophysical signals through inco
 mplete Fourier measurements. We propose new generic imaging techniques bas
 ed on convex optimization in the context of compressed sensing. The flexib
 ility of the framework notably allows introduction of prior information on
  the signals\, which offers the possibility of significant improvements of
  reconstruction relative to the standard matching pursuit algorithm CLEAN 
 used in radio astronomy.  We illustrate the potential of the approach by s
 tudying\nreconstruction performances on simulations of a star and galaxy i
 ntensity field and of a signal induced by cosmic strings in the CMB temper
 ature field\, observed with very generic interferometric configurations.
LOCATION:Ryle Seminar Room\, Cavendish Laboratory
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