Robustness is the key attribute of Spread Spectrum (SS) watermarking scheme. Several SS image watermarking algorithms have been proposed for multimedia signals but very few works have taken into consideration the issues responsible for robustness improvement. The current paper has critically analyzed few such factors namely properties of spreading codes, proper signal decomposition suitable for...

In this paper a preliminary estimation of the most common analysis methods of the vibration signals of a ball bearing is tried. The tested methods are the typical statistic analysis method, the Fourier transform, the frequencies spectrum analysis and the Wavelet method. Further testing under variable and/or radial loads is under investigation by the present research team before a final conclusi...

This paper presents a method for analysis of ECG patterns using Cross Wavelet Transform (XWT) and Wavelet Coherence (WCOH) techniques. The cross-correlation is the measure of similarity between two waveforms. The application of the Continuous Wavelet Transform to two time series and the cross examination of the two decomposition reveals localized similarities in time and scale. Morlet wavelet i...

PURPOSE Diffusion Spectrum Imaging enables to reconstruct the ensemble average propagator (EAP) at the expense of having to acquire a large number of measurements. Compressive sensing offers an efficient way to decrease the required number of measurements. The purpose of this work is to perform a thorough experimental comparison of three sampling strategies and six sparsifying transforms to sho...

In order to supply a gap of current resonance vibration and STFT demodulation method applied to rolling bearing fault feature extraction of city rail vehicle, a fault diagnosis method for rolling bearing is presented, which is based on the integration of improved wavelet packet, frequency energy analysis and Hilbert marginal spectrum. When faults occur in rolling bearing, the energy of the roll...

In order to study the time-frequency characteristics of shock wave signals under deep water explosion conditions, experiments are performed using medium containers simulate different depth and signal analysis is on data obtained in experiments. Traditional methods such as Fourier transform wavelet have many limitations deep-water analysis, HHT method used analyse experimental from three-dimensi...

Improving the vertical resolution is one of significant tasks for seismic data processing. Most traditional resolution-enhancement techniques assume that wavelet time-invariant. However, varies with wave propagation in subsurface. To solve this issue, a new spectral-modeling method proposed to extract time-varying using improved generalized S-transform (IGST) and higher-order Fourier series. Th...

Quadrature Carrier Multiplexing (QCM) allows simultaneous transmission of two message signals over the same bandwidth using quadrature carriers of the same frequency. This principle is used in this work to improve embedding capacity in digital image watermarking using wavelet transforms. Biorthogonal wavelet filters are used to design Hilbert transform (HT) pair and symmetric filter coefficient...

The electrocardiography examination, due to its accessibility and simplicity, has an important role in diagnostics of the heart ailments. It enables quick detection of various heart defects, undetectable by other kinds of diagnostic tools, so it is very popular. Nevertheless, the measured signal is exposed to a different disturbances. Among them, the electromagnetic interferences, drift of refe...