eprintid: 115
rev_number: 15
eprint_status: archive
userid: 4
dir: disk0/00/00/01/15
datestamp: 2013-06-14 08:48:03
lastmod: 2013-11-04 14:11:48
status_changed: 2013-06-14 08:48:03
type: thesis
metadata_visibility: show
creators_name: Trimeloni, L.
title: Inverse Scattering within the Rytov Approximation through BCS
ispublished: pub
subjects: TK
full_text_status: public
keywords: TDB
abstract: Le tecniche di "Compressive Sampling" (CS), recentemente sviluppate nell'ambito dell'elaborazione digitale dei segnali, si occupano di permettere la ricostruzione affidabile di segnali ad alta risoluzione con un numero di misure del fenomeno di interesse molto inferiore rispetto ai requisiti dati dal teorema del campionamento di Nyquist. Tali tecniche hanno come requisiti fondamentali (a) la linearità del problema, (b) la possibilità di rappresentare le incognite mediante vettori "sparsi" (cioè con pochi coefficienti non-nulli). Le tecniche di CS sono già state applicate con successo a numerosi problemi pratici in ambito radar, compressione delle immagini e della voce, e compressione video, nonché a problemi di microwave imaging, ad esempio formulati come problemi di Inverse Source.
Obiettivo del progetto è valutare le prestazioni di tali tecniche in problemi di imaging a microonde formulabili nell'approssimazione di RYTOV. In particolare, l'attività si occuperà di valutare un codice per l'inversione a microonde basata sul Multi-Task Bayesian Compressive Sampling (MT-BCS) correlando le informazioni provenienti dalle differenti viste per ottenere ricostruzioni ad elevata affidabilità.

date: 2012
date_type: published
institution: University of Trento
department: ELEDIA Research Center@DISI
thesis_type: masters
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[16]	M. Donelli, D. Franceschini, P. Rocca, and A. Massa, "Three-dimensional microwave imaging problems solved through an efficient multi-scaling particle swarm optimization," IEEE Trans. Geosci. Remote Sensing, vol. 47, no. 5, pp. 1467-1481, May 2009.
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[25]	G. Oliveri, A. Randazzo, M. Pastorino, and A. Massa, "Electromagnetic imaging within the contrast-source formulation by means of the multiscaling inexact Newton method," Journal of Optical Society of America A, vol. 29, no. 6, pp. 945-958, 2012.
[26]	M. Benedetti, D. Lesselier, M. Lambert, and A. Massa, "Multiple shapes reconstruction by means of multi-region level sets," IEEE Trans. Geosci. Remote Sensing, vol. 48, no. 5, pp. 2330-2342, May 2010.
[27]	M. Benedetti, D. Lesselier, M. Lambert, and A. Massa, "A multi-resolution technique based on shape optimization for the reconstruction of homogeneous dielectric objects," Inverse Problems, vol. 25, no. 1, pp. 1-26, Jan. 2009.

citation:   Trimeloni, L.  (2012) Inverse Scattering within the Rytov Approximation through BCS.  Masters thesis, University of Trento.   
document_url: http://www.eledia.org/students-reports/115/1/Abstract.A317.pdf