In this paper, the problem of despeckling SAR images when the input data is either an intensity or an amplitude signal is revisited. State-of-the-art despeckling methods based on Bayesian estimators in the wavelet domain, recently proposed in the literature, are taken into consideration. First, how these methods proposed for one format (e.g., intensity) can be adapted to the other format (e.g.,...

A despeckling technique based on multiple image reconstruction and selective 3-dimensional filtering is proposed. Multiple SAR images are reconstructed from a single SAR image by employing compressive sensing (CS) theory. In order to obtain multiple images from single SAR image, multiple subsets of pixels are selected from input SAR image by imposing restriction that each subset has at least 20...

This letter presents a method of synthetic aperture radar (SAR) image despeckling aimed to preserve the detail information while suppressing speckle noise. This method combines the nonlocal self-similarity partition and a proposed modified sparse decomposition. The nonlocal partition method groups a series of structure-similarity data sets. Each data set has a good sparsity for learning an over...

Extended abstract. The paper deals with the impact of synthetic-aperture radar (SAR) image despeckling on soil moisture estimation. X-band data are used. We investigated the correlation of the X-band SAR data for soil moisture estimation. Three model-based methods for SAR image despeckling using the Bayesian approach are presented. The Bayes theorem and the maximization of the posterior are giv...

Synthetic aperture radar (SAR) images are contaminated with noise called speckle that is multiplicative in nature. The presence of speckles SAR makes it impossible to understand and interpret for extensive range applications. However, certain characteristics the ability function irrespective weather conditions, making such worth processing order be able extract relevant information. A despeckli...

I. Introduction An image is defined as artifact or visual representation which is recorded by visual perceptions and then further digitized to convert it in aform which can be stored in the computer memory or some type of storage media such as hard disk.. After the image has been digitized, it can further be operated by various image processing operations. The unwanted material or particles or ...

This paper proposes a novel hybrid method to reduce speckle noise in ultrasonography. This method applies the total variation denoising algorithm to the output image of a recently reported anisotropic diffusion filter. Performance of the proposed method is illustrated using simulated and clinical images. Experimental results indicate the proposed method outperforms the existing despeckling sche...