Results 31 to 40 of about 2,474,827 (184)

A Comparative Study of Shearlet, Wavelet, Laplacian Pyramid, Curvelet, and Contourlet Transform to Defect Detection [PDF]

Journal of Soft Computing in Civil Engineering, 2023
This study presents a new approach based on shearlet transform for the first time to detect damages, and compare it with the wavelet, Laplacian pyramid, curvelet, and contourlet transforms to specify different types of defects in plate structures ...
Sepideh Vafaie, Eysa Salajegheh
doaj   +1 more source

Clifford-Valued Shearlet Transforms on Cl(P,Q)-Algebras

Journal of Mathematics, 2022
The shearlet transform is a promising and powerful time-frequency tool for analyzing nonstationary signals. In this article, we introduce a novel integral transform coined as the Clifford-valued shearlet transform on Cl(p,q) algebras which is designed to
Firdous A. Shah, Aajaz A. Teali, Mawardi Bahri   +2 more
doaj   +1 more source

Quaternionic shearlet transform [PDF]

Optik, 2018
Abstract The shearlet transform has been shown to be a valuable and powerful time–frequency analyzing tool for optics and non-stationary signal processing. In this article, we propose a novel transform called quaternionic shearlet transform which is designed to represent quaternion-valued signals at different scales, locations and orientations.
Firdous A. Shah, Azhar Y. Tantary
openaire   +1 more source

Perceptual watermarking for Discrete Shearlet transform [PDF]

2014 5th European Workshop on Visual Information Processing (EUVIP), 2014
This paper presents a new perceptual watermarking model for Discrete Shearlet transform (DST). DST provides the optimal representation [10] of the image features based on multi-resolution and multi-directional analysis. This property can be exploited on for watermark embedding to achieve the watermarking imperceptibility by introducing the human visual
Baharak Ahmaderaghi, Jesús Martínez del Rincón, Fatih Kurugollu, Ahmed Bouridane   +3 more
openaire   +3 more sources

The shearlet transform and Lizorkin spaces [PDF]

, 2020
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Bartolucci, Francesca, Pilipović, Stevan, Teofanov, Nenad   +2 more
openaire   +3 more sources

Use of the shearlet energy entropy and of the support vector machine classifier to process weak microseismic and desert seismic signals

Comptes Rendus. Géoscience, 2020
Low-amplitude signal detection is a key procedure in borehole microseismic and desert seismic exploration. Usually, signals are difficult to detect due to their low amplitude and noise contamination.
Li, Yue, Fan, Shiyu, Zhang, Chao, Yang, Baojun   +3 more
doaj   +1 more source

Digital Shearlet Transforms [PDF]

, 2012
Over the past years, various representation systems which sparsely approximate functions governed by anisotropic features such as edges in images have been proposed. We exemplarily mention the systems of contourlets, curvelets, and shearlets. Alongside the theoretical development of these systems, algorithmic realizations of the associated transforms ...
Gitta Kutyniok, Wang-Q Lim, Xiaosheng Zhuang   +2 more
openaire   +3 more sources

The Continuous Shearlet Transform in Arbitrary Space Dimensions [PDF]

Journal of Fourier Analysis and Applications, 2009
This note is concerned with the generalization of the continuous shearlet transform to higher dimensions. Similar to the two-dimensional case, our approach is based on translations, anisotropic dilations and specific shear matrices. We show that the associated integral transform again originates from a square-integrable representation of a ...
Dahlke, Stephan, Steidl, Gabriele, Teschke, Gerd   +2 more
openaire   +4 more sources

Linearized Riesz transform and quasi-monogenic shearlets [PDF]

International Journal of Wavelets, Multiresolution and Information Processing, 2014
The only quadrature operator of order two on L2(ℝ2) which covaries with orthogonal transforms, in particular rotations is (up to the sign) the Riesz transform. This property was used for the construction of monogenic wavelets and curvelets. Recently, shearlets were applied for various signal processing tasks.
Sören Häuser, Bettina Heise, Gabriele Steidl   +2 more
openaire   +2 more sources

Otherness feature extraction method for underground image based on Shearlet transform

Gong-kuang zidonghua, 2016
For the problem that face images collected underground are susceptible to dust interference and most feature extraction methods are sensitive to noise, an otherness feature extraction method for underground image based on Shearlet transform was proposed.
HUANG Yu, ZHANG Yingjun, PAN Lihu
doaj   +1 more source