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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-10@lptms.universite-paris-saclay.fr
DTSTART:20120109T143000Z
DTEND:20120109T143000Z
DTSTAMP:20130418T124829Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-de-la-f
 ederation-phystat-sud-florent-krzakala-2/
SUMMARY:Séminaire de la Fédération PHYSTAT-SUD : Florent Krzakala - IPhT
 \, CEA-Saclay\, salle Itzykson - 9 Jan 12 14:30
DESCRIPTION:Statistical physics approach to compressed sensing\nFlorent KRZ
 AKALA\, Physico-Chimie Théorique UMR CNRS Gulliver ESPCI\nCompressed sens
 ing is triggering a major evolution in signal acquisition that changes com
 pletely the way we think about experiments and measurements. It indicates 
 that most data\, signals and images\, that are usually compressible and ha
 ve redundancy\, can be reconstructed from much fewer measurements than wha
 t was usually considered necessary\, resulting in a drastic gain of time\,
  cost\, and measurement precision. The idea consists in sampling a sparse 
 signal using some random projections\, and later using computational power
  for its exact reconstruction\, so that only the necessary information is 
 measured. This has been applied to many situations\, from medical imagery 
 and one-pixel-camera to confocal microscopy\, acoustic holography or DNA m
 icro-array analysis in biology.\nIn this talk\, I will start by a general 
 instruction to compressed sensing for physicists and discuss the state of 
 the art reconstruction algorithms. Currently used reconstruction technique
 s are however limited to acquisition rates still higher than the true dens
 ity of the signal. By using a mapping to a statistical physics problem\, a
 nd motivated by the theory of crystal nucleation\, I will introduce a new 
 algorithm\, and new measurement protocols\, that achieves exact reconstruc
 tion of the signal even at measurement rates very close to the lowest poss
 ible ones.\nReferences: http://arxiv.org/abs/1109.4424 http://nuit-blanche
 .blogspot.com/p/teaching-compressed-sensing.html http://nuit-blanche.blogs
 pot.com/2011/09/stunning-development-in-breaking-donoho.html
LOCATION:IPhT\, CEA-Saclay\, salle Itzykson\, CEA - Saclay\, Saclay\, Franc
 e
GEO:48.73668;2.180033999999978
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=CEA - Saclay\, Saclay\, Fra
 nce;X-APPLE-RADIUS=100;X-TITLE=IPhT\, CEA-Saclay\, salle Itzykson:geo:48.7
 3668,2.180033999999978
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