?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fwww.eledia.org%2Fstudents-reports%2F377%2F&rft.title=Contrast+Field+and+Contrast+Source+Formulations+for+Microwave+Imaging%3A+A+Comparative+Analysis&rft.creator=Lizzi%2C+Leonardo&rft.creator=Rocca%2C+Paolo&rft.creator=Donelli%2C+Massimo&rft.creator=Massa%2C+Andrea&rft.subject=TU+Technical+Reports+and+Publications&rft.description=Inverse+scattering+techniques+are+aimed+at+recovering+the+profiles%2C+positions+and+constitutive+parameters+of+unknown+objects+belonging+to+an+inaccessible+region+illuminated+by+known+and+successive+probing+fields+from+the+measurements+of+the+scattered+field+(i.e.%2C+the+problem+data)+collected+by+a+set+of+sensors+in+an+external+observation+domain.+Within+such+a+framework%2C+different+methods+have+been+proposed%2C+based+either+on+system+matrix+inversion+or+optimization+approaches.+Since+multiple+scattering+effects+cannot+be+neglegted%2C+full+non+linear+formulations+have+to+be+used.+The+contrast+field+inversion+(CFI)+and+the+contrast+source+inversion+(CSI)+have+been+widely+employed+in+a+lot+of+practical+applications+(e.g.%2C+biomedical+diagnosis+or+UXO+and+landmines+detection%2C+NDT%2FNDE%2C+archeology%2C+etc.).+CFI+based+techniques+recast+the+inversion+problem+to+the+minimization+of+a+cost+function+of+two+integral+terms+both+non+linear+related+to+the+so+called+Data+and+State%2FObject+Equations+%5B1%5D%5B2%5D.+The+goal+is+to+determine+the+unknown+contrast+function+and+total+field+within+the+investigation+domain.+On+the+other+hand%2C+in+the+CSI+algorithm+the+contrast+sources+(i.e.%2C+the+equivalent+currents+defined+in+the+support+of+the+scatterers)+and+the+contrast+itself+are+iteratively+reconstructed+%5B3%5D%5B4%5D%5B5%5D.+In+such+a+case%2C+the+cost+function+is+still+composed+by+two+terms%2C+but+only+one+is+non+linear.+This+contribution+proposes+a+comparison+between+the+CFI+and+CSI+methods+in+terms+of+solution+accuracy%2C+robustness+to+local+minima+and+noise%2C+and+computational+efficiency.+The+analysis+is+aimed+at+pointing+out+potentialities+and+limitations+of+both+the+inversion+formulations+when+dealing+with+synthetic+as+well+as+experimental+datasets.+Towards+this+end%2C+a+set+of+representative+results+obtained+with+different+minimization+techniques+both+deterministic+%5B6%5D+and+stochastic+%5B7%5D+are+reported+and+compared.&rft.date=2011-01&rft.type=Technical+Report&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=http%3A%2F%2Fwww.eledia.org%2Fstudents-reports%2F377%2F1%2FDISI-11-220.C145.pdf&rft.identifier=++Lizzi%2C+Leonardo+and+Rocca%2C+Paolo+and+Donelli%2C+Massimo+and+Massa%2C+Andrea++(2011)+Contrast+Field+and+Contrast+Source+Formulations+for+Microwave+Imaging%3A+A+Comparative+Analysis.++%5BTechnical+Report%5D+++++