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Contributo in atti di convegno
Tipo: Contributo in atti di convegno
Titolo: Benefits of blind speckle decorrelation for InSAR processing
Anno di pubblicazione: 2014
Autori: Sica, F. and Alparone, L. and Argenti, F. and Fornaro, G. and Lapini, A. and Reale, D.
Affiliazioni autori: Alparone, L (Reprint Author), Natl Res Council CNR Naples, Inst Elect Sensing Environm IREA, Naples, Italy. Sica, F.; Fornaro, G.; Reale, D., Natl Res Council CNR Naples, Inst Elect Sensing Environm IREA, Naples, Italy.
Abstract: In this paper, the authors have investigated whether the noise whitening procedure developed as a preprocessing step before despeckling of detected images may be useful also in contexts where phase information is exploited. In a preliminary test set, an interferometric pair of COSMO-SkyMed StripMap images, featuring industrial buildings and vegetated areas, has been: 1) focused without Hamming window (aimed at improving the focusing of targets at the cost of introducing a spatial correlation of background noise), starting from raw data. 2) focused with Hamming window, starting from raw data; 3) preprocessed for complex noise whitening, starting from data at point 2). From the complex interferograms, coherence and interferometric phase maps have been calculated for the three cases by means of boxcar filtering. In case 1) coherence is low on vegetation and also suffers from spreading of areas characterized by strong backscattering because of the presence of high sidelobes. In case 2) points targets and buildings in general are much more defined, thanks to the sidelobe suppression achieved by Hamming filtering, but the background coherence is abnormally increased, due to the introduction of a spatial correlation. Case 3) is the most favorable because whitening operation carries out low coherence on vegetation and high coherence on buildings, where the effects of Hamming filtering are retained. An analysis of the phase field reveals that case 3) should be expedited also in terms of phase unwrapping. Thus, the whitening procedure, devised as a blind preprocessing patch of SLC data, with the goal of a better despeckling, is useful also for SAR interferometry, in which the tradeoff, dictated by the coefficient of the Hamming window, between the ideal situations of focused targets and uncorrelated speckle may be relaxed.
Lingua abstract: inglese
Numero volume: 9243
Proceedings of SPIE, the International Society for Optical Engineering
SPIE, The International Society for Optical Engineering
Titolo del volume: SAR IMAGE ANALYSIS, MODELING, AND TECHNIQUES XIV
Stato della pubblicazione: Published version
Indicizzato da: ISI Web of Science (WOS) 
Congresso nome: XIV Conference on SAR Image Analysis, Modeling, and Techniques
Congresso data: 22-25 settembre 2014
Congresso rilevanza: Internazionale
Congresso relazione: Contributo
Altre informazioni: Conference on SAR Image Analysis, Modeling, and Techniques XIV, Amsterdam, NETHERLANDS, SEP 24-25, 2014
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