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SUMMARY:Alternating Projection\, Ptychographic Imaging and connection grap
 h Laplacian - Wu\, H (Stanford University)
DTSTART:20140212T133000Z
DTEND:20140212T141500Z
UID:TALK50824@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: Yu-Chao Tu (Mathematics\, Princeton University)\, 
 Stefano Marchesini (Lawrence Berkeley Lab) \n\nIn this talk\, we demonstra
 te the global convergence of the alternating projection (AP) algorithm to 
 a unique solution up to a global phase factor in the ptychographic imaging
 . Additionally\, we survey the intimate relationship between the AP algori
 thm and the notion of ``phase synchronization''. Based on this relationshi
 p\, the recently developed technique connection graph Laplacian is applied
  to quickly construct an accurate initial guess\, and accelerate convergen
 ce speed for large scale diffraction data problems. This is a joint work w
 ith Stefano Marchesini and Yu-Chao Tu.\n
LOCATION:Seminar Room 1\, Newton Institute
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