one of the most common signals used for achieving high range resolution in radar is stepped-frequency signals. when a target is stationary in these radars, dft (discrete fourier transform) based processing is used to attain high range resolution profile (hrrp). however, in the case of moving target, due to spreading of the echo signal spectrum, dft based processing is not optimal and decreases ...

    Necessary conditions for  shearlet  and cone-adapted shearlet systems to be frames are presented with respect to the admissibility condition of generators.

Image denoising is a fundamental task in computer vision and image processing system with an aim of estimating the original by eliminating noise artefact from noise-corrupted version image. In this study, nonlocal means (NLM) algorithm NSST (non-subsampled shearlet transform) has been designed to surface computationally simple algorithm. Initially, employed decompose source into coarser finer l...

The classical Weierstrass transform is an isometric operator mapping elements of the weighted L 2 − space ( R , exp x / ) to Fock space. It has numereous applications in physics and applied mathematics. In this paper, we define analogue version discrete Hermitian Clifford analysis, where functions are defined on a grid rather than continuous This new based definition, combination with Gaussian ...

SAR images have been widely used in many fields such as military and remote sensing. So the suppression of the speckle has been an important research issues. To improve the visual effect of non-local means, generalized non-local (GNL) means with optimized pixel-wise weighting is applied to shrink the coefficients of non-subsample Shearlet transform (NSST) of SAR image. The new method can optimi...

in this paper, we give a necessary condition for function in l^2with its dual to generate a dual shearlet tight frame with respect to admissibility.

Introduction In recent years methods based on radio frequency waves have been used for detecting breast cancer. Using theses waves leads to better results in early detection of breast cancer comparing with conventional mammography which has been used during several years. Materials and Methods In this paper, a new method is introduced for detection of backscattered signals which are received by...