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SUMMARY:Albert Fannjiang (UC Davis)
DTSTART:20210610T160000Z
DTEND:20210610T170000Z
DTSTAMP:20260423T052830Z
UID:Inverse/50
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Inverse/50/"
 >Ptychography: Theory and Algorithms</a>\nby Albert Fannjiang (UC Davis) a
 s part of International Zoom Inverse Problems Seminar\, UC Irvine\n\n\nAbs
 tract\nPtychography is a scanning version of coded-aperture phase retrieva
 l\, a versatile method that finds its way to many applications in molecula
 r and materials imaging. Its operating principle is that measurement redun
 dancy due to overlap of scanning probe removes the usual ambiguities in st
 andard phase retrieval by providing extra constraint for unique characteri
 zation of the underlying extended object. \n\nA remarkable effect of ptych
 ography emerged in physics experiments more than 10 years ago that the cod
 ed aperture can be recovered along with the unknown object\, up to a const
 ant phase factor\, for certain measurement schemes with sufficient probe o
 verlap (i.e. blind ptychography). We review recent progress in mathematica
 l theory and algorithms developed for blind ptychography operating at real
 istic level of measurement resources.\n
LOCATION:https://researchseminars.org/talk/Inverse/50/
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