The information extraction capability of two widely used signal processing tools, Hilbert Transform (HT) and Wavelet Transform (WT), is investigated to develop a multi-class fault diagnosis scheme for induction motor using radial vibration signals. The vibration signals are associated with unique predominant frequency components and instantaneous amplitudes depending on the motor condition. Usi...

Resolution enhancement (RE) schemes which are not based on wavelets has one of the major drawbacks of losing high frequency contents which results in blurring. The discrete wavelettransform-based (DWT) Resolution Enhancement scheme generates artifacts (due to a DWT shift-variant property). A wavelet-Domain approach based on dual-tree complex wavelet transform (DT-CWT) & nonlocal means (NLM) is ...

This study conducts a detailed analysis of multiscale periodic features involved in the annual and seasonal precipitation signals at the typical coastal reclamation region in China by selecting the suitable continuous wavelet transform (CWT) and innovatively combining the improved Hilbert–Huang transform (HHT), and further deduces the precipitation trend and its impacts on the future soil hydro...

This article sheds light on a quantitative method allowing psychologists and behavioral scientists to take into account the specific characteristics emerging from the interaction between two sets of data in general and two individuals in particular. The current article outlines the practical elements of the cross-wavelet transform (CWT) method, highlighting WHY such a method is important in the...

High Peak – to – average power ratio (PAPR) of transmitted signals is a major shortcoming for multicarrier modulation system such as orthogonal frequency division multiplexing (OFDM) and wavelet packet modulation (WPM). This paper introduces a novel OFDM system base on dual – tree complex wavelet transform (DT-CWT). In the proposed scheme, DTCWT is used in the place of fast Fourier transform (F...

Image compression is a technique used to reduce the storage required to save an image. The existing image coding methods cannot support content based image compression and enlargement for arbitrary resolution display devices. In multimedia communications, image retargeting is generally required at the user end. The work presented in this paper addresses the increasing demand of visual signal de...

Recognition of face is a good authentication and verification tool of people, has a great interest in our live. One of its important algorithms is eigenface which has been used widely; it has limitations such as poor discriminatory power, to solve this problem fisherface is used which attempt the distance between is maximum classes and the distance inside class is minimum, but it suitable for s...

For many years, topic writing has been used as the composition form for Chinese College Entrance Examination, which is controversial because it not conducive to development of students’ imagination and thinking ability. In recent continuation task (CWT) a new item included in Examination some provinces, attracting great attention from large number in-service teachers. A variety teaching methods...

Due to extreme operating conditions such as high-speed and heavy loads, ball screws are prone damages, that affect the accuracy operational safety of mechanical equipment. As strong background noise weak fault characteristics, it is difficult capture inherent state only depending on time-domain or frequency-domain information from vibration signal. In this paper, a diagnosis method for screw ba...