A dual tree complex wavelet transform (DT -CWT)based directional interpolation scheme for denoising of noisy images is proposed . The problems of denoising and interpolation are modeled as to estimate the noiseless and missing samples under the same framework of optimal estimation. Initially, DT -CWT is used to decompose an input low-resolution noisy wage irito low and high frequency subbands. ...

Bathymetry is one of the most conspicuous variables to consider in any study involving marine environments. In developing countries, accurate and up to date bathymetric charts are rare or in most cases limited to local areas, most of them available only in hardcopy format. This is the case of the Yucatan submerged platform. In this study, we compare and discuss the performance of two spatial in...

A modified immersed-boundary method is developed using the direct-forcing concept. An improved bilinear interpolation/extrapolation algorithm is implemented for more accurate boundary forcing expressions and easier implementation. Detailed discussions of the method are presented on the stability, velocity interpolation on the immersed boundary, directforcing extrapolation to the grid points, re...

A new method of DTM construction based on quadrangular irregular networks (QINs) that considers all the original data points and has a topological matrix is presented. A numerical test and a real-world example are used to comparatively analyse the accuracy of QINs against classical interpolation methods and other DTM representation methods, including SPLINE, KRIGING and triangulated irregular n...

Pseudo Zernike Moments (PZMs) are very popular moments among the family of orthogonal radial moments. While several methods have been proposed to enhance accuracy, accurate PZMs computation for gray level images is still an open issue. PZMs suffer from image discretization error, geometric error and numerical integration error, which result in the degradation of the reconstructed images for hig...

This paper presents a method to optimize 2-D sparse array configurations along with technique interpolate holes accurately estimate the direction of arrival (DOA). Conventional arrays are often defined using closed-form representation and have property that they can create hole-free difference co-arrays DOAs incident signals outnumber physical elements. However, this restricts configuration lim...

We consider the problem of approximating the output of a parametric electromagnetic field model in the presence of a large number of uncertain input parameters. Given a sufficiently smooth output with respect to the input parameters, such problems are often tackled with interpolation-based approaches, such as the stochastic collocation method on tensor-product or isotropic sparse grids. Due to ...

We report an analytical representation of the correlation energy ec(rs, zeta) for a uniform electron gas (UEG), where rs is Seitz radius or density parameter and zeta relative spin polarization. The new functional, called W20, constructed to capture known high-density low-density limit (for = 0 1) without any fitting parameters. comparative assessment against recent quantum Monte Carlo (QMC) re...