Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2019
Forfattere
Masoud Mahdianpari Mahdi Motagh Vahid Akbari Fariba Mohammadimanesh Bahram SalehiSammendrag
Synthetic Aperture Radar (SAR) data have gained interest for a variety of remote sensing applications, given the capability of SAR sensors to operate independent of solar radiation and day/night conditions. However, the radiometric quality of SAR images is hindered by speckle noise, which affects further image processing and interpretation. As such, speckle reduction is a crucial pre-processing step in many remote sensing studies based on SAR imagery. This study proposes a new adaptive de-speckling method based on a Gaussian Markov Random Field (GMRF) model. The proposed method integrates both pixel-wised and contextual information using a weighted summation technique. As a by-product of the proposed method, a de-speckled pseudo-span image, which is obtained from the least-squares analysis of the de-speckled multi-polarization channels, is also produced. Experimental results from the medium resolution, fully polarimetric L-band ALOS PALSAR data demonstrate the effectiveness of the proposed algorithm compared to other well-known de-speckling approaches. The de-speckled images produced by the proposed method maintainthe mean value of the original image in homogenous areas, while preserving the edges of features in heterogeneous regions. In particular, the equivalent number of look (ENL) achieved using the proposed method improves by about 15% and 47% compared to the NL-SAR and SARBM3D de-speckling approaches, respectively. Other evaluation indices, such as the mean and variance of the ratio image also reveal the superiority of the proposed method relative to other de-speckling approaches examined in this study.
Forfattere
Tomáš Hlásny Paal Krokene Andrew Liebhold Claire Montagné-Huck Jörg Müller Hua Qin Kenneth F Raffa Mart-Jan Schelhaas Rupert Seidl Miroslav Svoboda Heli ViiriSammendrag
Det er ikke registrert sammendrag
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Forfattere
Rene Friedland Gerald Schernewski Ulf Gräwe Inga Greipsland Dalila Palazzo Marianna PastuszakSammendrag
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Forfattere
Siri Svendgård-Stokke Hege Ulfeng Lise Dalsgaard Stephanie Eisner Roar Lågbu Ove Mindor Klakegg Eivind Solbakken Gunnhild Søgaard Geir-Harald StrandSammendrag
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Forfattere
Signe Nybø Erik Framstad Simon Jakobsson Marianne Evju Anders Lyngstad Hanne Sickel Anne Sverdrup-Thygeson Joachim Paul Töpper Vigdis Vandvik Liv Guri Velle Per Arild AarrestadSammendrag
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Forfattere
Arnfinn NesSammendrag
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