AN ADAPTIVE STATIONARY WAVELET-BASED TECHNIQUE FOR DESPECKLING SAR IMAGE
Amlan Das, Anjan Kumar Talukdar, Kandarpa Kumar Sarma · 2012
In this paper, we present a Stationary Wavelet Transform (SWT) based method for the purpose of despeckling the Synthetic Aperture radar (SAR) images by applying a maximum a posteriori probability (MAP) condition to estimate the noise free wavelet coefficients. A MAP Estimator is designed for this purpose which uses Rayleigh distribution for modeling the speckle noise and Laplacian distribution for modeling the statistics of the noise free wavelet coefficients. The parameters required for MAP estimator is determined by the technique used for parameter estimation after SWT. The experimental results show that the proposed despeckling algorithm efficiently removes speckle noise from the SAR images. KeywordsSynnthetic aperture radar (SAR), despeckling, Stationary Wavelet Transform (SWT), Maximum a posteriori probability (MAP) Estimator.