RABASAR: A FAST RATIO BASED MULTI-TEMPORAL SAR DESPECKLING
ZHAO, Weiying
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
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Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
ZHAO, Weiying
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
MAÎTRE, Henri
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
NICOLAS, Jean-Marie
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
TUPIN, Florence
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
< Reduce
Image, Modélisation, Analyse, GEométrie, Synthèse [IMAGES]
Département Images, Données, Signal [IDS]
Language
en
Communication dans un congrès
This item was published in
IGARSS, IGARSS, IGARSS, 2018-07, Valencia. 2018-07
English Abstract
In this paper, a generic method is proposed to reduce specklein multi-temporal stacks of SAR images. The method is basedon the computation of a “super-image”, with a large num-ber of looks, by temporal averaging. Then, ...Read more >
In this paper, a generic method is proposed to reduce specklein multi-temporal stacks of SAR images. The method is basedon the computation of a “super-image”, with a large num-ber of looks, by temporal averaging. Then, ratio images areformed by dividing each image of the multi-temporal stackby the “super-image”. In the absence of changes of the ra-diometry, the temporal fluctuations of the intensity at a givenspatial location are due to the speckle phenomenon. In areasaffected by temporal changes, fluctuations cannot be ascribedto speckle only but also to radiometric changes. The overalleffect of the division by the “super-image” is the spatial sta-tionarity improvement: ratio images are much more homoge-neous than the original images. Therefore, filtering these ratioimages with a speckle-reduction method is more effective, interms of speckle suppression, than filtering the original multi-temporal stack. After denoising of the ratio image, the de-speckled multi-temporal stack is obtained by multiplicationwith the “super-image”. Results are presented and analyzedboth on synthetic and real SAR data and show the interest ofthe proposed approach.Read less <
English Keywords
Multi-temporal SAR series
ratio image
super-image
SAR
despeckling
Origin
Hal imported