Seminar: Sparse Phase Retrieval

SpeakerShiro Ikeda
AffiliationThe Institute of Statistical Mathematics
DateThursday, 16 Feb 2012
Time15:00 - 16:00
LocationRoom 102, Torrington Place
Event seriesCSML Joint Seminar Series

We propose the SPR (sparse phase retrieval) method, which is
a new phase retrieval method for coherent x-ray diffraction imaging
(CXDI). Conventional phase retrieval methods effectively solve the
problem for high signal-to-noise ratio measurements, but would not be
sufficient for single biomolecular imaging which is expected to be
realized with femto-second x-ray free electron laser pulses. The SPR
method is based on the Bayesian statistics. It does not need to set
the object boundary constraint that is required by the commonly used
hybrid input-output (HIO) method, instead a prior distribution is
defined with an exponential distribution and used for the estimation.
Simulation results demonstrate that the proposed method reconstructs
the electron density under a noisy condition even some central pixels
are masked.

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