5 research outputs found
An Adaptive Coding Pass Scanning Algorithm for Optimal Rate Control in Biomedical Images
High-efficiency, high-quality biomedical image compression is desirable especially for the telemedicine applications. This paper presents an adaptive coding pass scanning (ACPS) algorithm for optimal rate control. It can identify the significant portions of an image and discard insignificant ones as early as possible. As a result, waste of computational power and memory space can be avoided. We replace the benchmark algorithm known as postcompression rate distortion (PCRD) by ACPS. Experimental results show that ACPS is preferable to PCRD in terms of the rate distortion curve and computation time
Numerical Solution of Fredholm Integral Equations of Second Kind using Haar Wavelets
Integral equations have been one of the most important tools in several areas of science and engineering. In this paper, we use Haar wavelet method for the numerical solution of one-dimensional and two-dimensional Fredholm integral equations of second kind. The basic idea of Haar wavelet collocation method is to convert the integral equation into a system of algebraic equations that involves a finite number of variables. The numerical results are compared with the exact solution to prove the accuracy of the Haar wavelet method
The Inverse Fundamental Operator Marching Method for Cauchy Problems in Range-Dependent Stratified Waveguides
The inverse fundamental operator marching method (IFOMM) is suggested to
solve Cauchy problems associated with the Helmholtz equation in stratified waveguides.
It is observed that the method for large-scale Cauchy problems is computationally
efficient, highly accurate, and stable with respect to the noise in the data
for the propagating part of a starting field. In further, the application scope of the
IFOMM is discussed through providing an error estimation for the method. The estimation
indicates that the IFOMM particularly suits to compute wave propagation
in long-range and slowly varying stratified waveguides
Application of higher order Haar wavelet method for solving nonlinear evolution equations
The recently introduced higher order Haar wavelet method is treated for solving evolution equations. The wave equation, the Burgers’ equations and the Korteweg-de Vries equation are considered as model problems. The detailed analysis of the accuracy of the Haar wavelet method and the higher order Haar wavelet method is performed. The obtained results are validated against the exact solutions
Study of Railway Track Irregularity Standard Deviation Time Series Based on Data Mining and Linear Model
Good track geometry state ensures the safe operation of the railway passenger service and freight service. Railway transportation plays an important role in the Chinese economic and social development. This paper studies track irregularity standard deviation time series data and focuses on the characteristics and trend changes of track state by applying clustering analysis. Linear recursive model and linear-ARMA model based on wavelet decomposition reconstruction are proposed, and all they offer supports for the safe management of railway transportation