Speckle removal of multi-polarisation SAR imagery using variational method

Yaxin Peng, Fang Li, Jing Qin, Chaomin Shen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In this paper a new speckle reduction method for multi-polarisation Synthetic Aperture Radar (SAR) is proposed by using a constrained-variational model. Variational method is a new technique for SAR speckle removal. In this paper, we generalize the variational method from single-polarisation SAR into multi-polarisation SAR. For a given multi-polarisation SAR, we could define an energy functional. The energy evolves as the original image changes. When the energy reaches its minimum, the corresponding image is regarded as the desired result. In each channel of the multi-polarisation SAR, the speckle follows a Gamma law with mean μ = 1 and variance σ2 = 1/M for M-look SAR. This statistical information is used to construct the energy functional. Our energy is a regularization term, which is the integral for the norm of image gradient, with constraints coming from each channel. Then we use the variational method and heat flow method to obtain the minimizer of the energy. A three-intensity image (|HH|2, |HV|2 and |VV|2) is used to demonstrate our algorithm. Numerical experiment shows a promising result.

Original languageEnglish
Title of host publicationMIPPR 2007
Subtitle of host publicationRemote Sensing and GIS Data Processing and Applications; and Innovative Multispectral Technology and Applications
DOIs
StatePublished - 2007
EventMIPPR 2007: Remote Sensing and GIS Data Processing and Applications; and Innovative Multispectral Technology and Applications - Wuhan, China
Duration: Nov 15 2007Nov 17 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6790
ISSN (Print)0277-786X

Conference

ConferenceMIPPR 2007: Remote Sensing and GIS Data Processing and Applications; and Innovative Multispectral Technology and Applications
Country/TerritoryChina
CityWuhan
Period11/15/0711/17/07

Keywords

  • Euler-Lagrange equation
  • Multi-polarisation SAR
  • Speckle
  • Variational method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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