Image texture characterization using the discrete orthonormal S-transform

S Drabycz, RG Stockwell, JR Mitchell - Journal of digital imaging, 2009‏ - Springer
We present a new efficient approach for characterizing image texture based on a recently
published discrete, orthonormal space-frequency transform known as the DOST. We …

Hybrid seismic denoising using higher‐order statistics and improved wavelet block thresholding

SM Mousavi, CA Langston - Bulletin of the Seismological …, 2016‏ - pubs.geoscienceworld.org
We introduce a nondiagonal seismic denoising method based on the continuous wavelet
transform with hybrid block thresholding (BT). Parameters for the BT step are adaptively …

Detection and classification of power quality disturbances using GWO ELM

U Subudhi, S Dash - Journal of Industrial Information Integration, 2021‏ - Elsevier
Many industies have equipments sensitive to bad power quality that affects their production
and product quality. Therefore, it is important to automatically monitor the quality of power …

Fractional S-transform and its properties: a comprehensive survey

R Ranjan, N **dal, AK Singh - Wireless Personal Communications, 2020‏ - Springer
In time–frequency analysis, generalization of S-transform (ST) is known as fractional S-
transform. Recently, fractional S-transform (FrST) has played an important role in the area of …

Automatic noise-removal/signal-removal based on general cross-validation thresholding in synchrosqueezed domain and its application on earthquake data

SM Mousavi, CA Langston - Geophysics, 2017‏ - library.seg.org
Recorded seismic signals are often corrupted by noise. We have developed an automatic
noise-attenuation method for single-channel seismic data, based upon high-resolution time …

Adaptive noise estimation and suppression for improving microseismic event detection

SM Mousavi, CA Langston - Journal of Applied Geophysics, 2016‏ - Elsevier
Microseismic data recorded by surface arrays are often strongly contaminated by unwanted
noise. This background noise makes the detection of small magnitude events difficult. A …

Frequency‐dependent phase coherence for noise suppression in seismic array data

M Schimmel, J Gallart - Journal of Geophysical Research: Solid …, 2007‏ - Wiley Online Library
We introduce a coherence measure for seismic signal enhancement through incoherent
noise attenuation. Our processing tool is designed for densely spaced arrays and identifies …

Ground roll attenuation using the S and x‐f‐k transforms

R Askari, HR Siahkoohi - Geophysical Prospecting, 2008‏ - earthdoc.org
Ground roll, which is characterized by low frequency and high amplitude, is an old seismic
data processing problem in land‐based seismic acquisition. Common techniques for ground …

The inverse S-transform in filters with time-frequency localization

M Schimmel, J Gallart - IEEE Transactions on signal …, 2005‏ - ieeexplore.ieee.org
The S-transform provides a framework for data-adaptive filters which take advantage of time-
frequency localized spectra. These filters basically consist in a data transformation to the …

Denoising of Seismograms Using the S Transform

S Parolai - Bulletin of the Seismological Society of …, 2009‏ - pubs.geoscienceworld.org
The growing number of urban seismological experiments within the framework of seismic
hazard studies has increased the necessity of effective tools for denoising seismograms …