New trends in despeckling: undecimated-wavelet shrinkage and fuzzy matching-pursuits estimation (Contributo in atti di convegno)

Type

• Prodotto della ricerca (Classe)
• Contributo in atti di convegno (Classe)

Label

• New trends in despeckling: undecimated-wavelet shrinkage and fuzzy matching-pursuits estimation (Contributo in atti di convegno) (literal)

Anno

• 2002-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1117/12.453976 (literal)

Alternative label

• Bruno Aiazzi; Luciano Alparone; Fabrizio Argenti; Stefano Baronti (2002)
  New trends in despeckling: undecimated-wavelet shrinkage and fuzzy matching-pursuits estimation
  in SPIE Remote Sensing 2001: SAR Image Analysis, Modeling, and Techniques IV, Tolosa, Francia, 17-21 Settembre 2001
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Bruno Aiazzi; Luciano Alparone; Fabrizio Argenti; Stefano Baronti (literal)

Pagina inizio

• 41 (literal)

Pagina fine

• 52 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

• http://spiedigitallibrary.org/proceedings/resource/2/psisdg/4543/1/41_1?isAuthorized=no (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume

• Proceedings of SPIE Remote Sensing 2001: SAR Image Analysis, Modeling, and Techniques IV (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 4543 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana

• 4543 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 12 (literal)

Note

• ISI Web of Science (WOS) (literal)
• Scopu (literal)
• Google Scholar (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• \"Nello Carrara\" Research Institute on Electromagnetic Waves IROE-CNR, Via Panciatichi, 64, I-50127 Firenze, Italy DET - Department of Electronics and Telecommunications, University of Florence, Via Santa Marta, 3, I-50139 Firenze, Italy DET - Department of Electronics and Telecommunications, University of Florence, Via Santa Marta, 3, I-50139 Firenze, Italy \"Nello Carrara\" Research Institute on Electromagnetic Waves IROE-CNR, Via Panciatichi, 64, I-50127 Firenze, Italy (literal)

Titolo

• New trends in despeckling: undecimated-wavelet shrinkage and fuzzy matching-pursuits estimation (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn

• 0-8194-4268-2 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume

• F. Posa (literal)

Abstract

• This paper presents two novel approaches to speckle reduction in SAR images. The former relies on the multiplicative speckle model as an MMSE filtering performed in the wavelet domain by means of an adaptive shrinkage of the detail coefficients of an undecimated decomposition. Each coefficient is shrunk by the variance ratio of the noise-free coefficient to the noisy one. All the above quantities are analytically calculated from the speckled image, the noise variance, and the wavelet filters only, without resorting to any model to describe the underlying backscatter. Estimation of the local statistics driving the filter is expedited and layered processing allows to extend adaptivity also across the spatial scale. The latter is not model-based and provides a blind estimation of the backscatter underlying the speckled image stated as a problem of matching pursuits. The local adaptive MMSE estimator is obtained as an expansion in series of a finite number of \"prototype\" estimators, fitting the spatial features of the different statistical classes encountered, e.g., edges and textures. Such estimators are calculated in a fuzzy fashion through an automatic training procedure. The space-varying coefficients of the expansion are stated as degrees of fuzzy membership of a pixel to each of the estimators. A thorough performance comparison is carded out with the Gamma-MAP filter and with the Rational Laplacian Pyramid (RLP) filter, recently introduced by three of the authors. On simulated speckled images both the proposed filters gain almost 3 dB SNR with respect to conventional local-statistics (Lee/Kuan) filtering. Experiments carried out on widespread test SAR images and on a speckled mosaic image, comprising synthetic shapes, textures, and details from true SAR images, demonstrate that the visual quality of the resuks is excellent in terms of both background smoothing and preservation of edge sharpness, textures, and point targets. The absence of decimation in the wavelet decomposition avoids the typical ringing impairments produced by critically-sampled wavelet-based denoising. (literal)

Editore

• SPIE-International Society for Optical Engineering (Editore)

Prodotto di

• Sistemi, metodi di elaborazione ed applicazioni di telerilevamento aerospaziale (ICT.P10.005.001) (Modulo)
• Institute of applied physics \"Nello Carrara\" (IFAC) (Istituto)

Autore CNR

• BRUNO AIAZZI (Unità di personale interno)
• LUCIANO ALPARONE (Unità di personale esterno)
• STEFANO BARONTI (Unità di personale interno)

Insieme di parole chiave

• Keywords of "New trends in despeckling: undecimated-wavelet shrinkage and fuzzy matching-pursuits estimation" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• BRUNO AIAZZI (Unità di personale interno)
• STEFANO BARONTI (Unità di personale interno)
• LUCIANO ALPARONE (Unità di personale esterno)

Prodotto

• Institute of applied physics \"Nello Carrara\" (IFAC) (Istituto)
• Sistemi, metodi di elaborazione ed applicazioni di telerilevamento aerospaziale (ICT.P10.005.001) (Modulo)

Editore di

• SPIE-International Society for Optical Engineering (Editore)

Insieme di parole chiave di

• Keywords of "New trends in despeckling: undecimated-wavelet shrinkage and fuzzy matching-pursuits estimation" (Insieme di parole chiave)