نتایج جستجو برای: discrete shearlet transform

تعداد نتایج: 259373  

Journal: :Journal of Fourier Analysis and Applications 2009

2009
STEPHAN DAHLKE

This note is concerned with the generalization of the continuous shearlet transform to higher dimensions. Quite recently, a first approach has been derived in [4]. We present an alternative version which deviates from [4] mainly by a different generalization of the shear component. It turns out that the resulting integral transform is again associated with a square-integrable group representation.

2013
Zhiyong Fan Quansen Sun Feng Ruan Yiguang Gong Zexuan Ji

In allusion to remove Racian noise while lessen the loss of details as low as possible, this paper proposed an filter algorithm which comprehensive utilize Multi-Objective Genetic Algorithm (MOGA) and Shearlet transform based on a Multi-scale Geometric Analysis (MGA) theory. First, it performs a wavelet multi-scale decomposition of image. Then, it builds target function in MOGA by several evalu...

Journal: :Adv. Comput. Math. 2017
Kanghui Guo Demetrio Labate

Edges and surface boundaries are often the most relevant features in images and multidimensional data. It is well known that multiscale methods including wavelets and their more sophisticated multidimensional siblings offer a powerful tool for the analysis and detection of such sets. Among such methods, the continuous shearlet transform has been especially successful. This method combines aniso...

Journal: :Symmetry 2017
Yanhui Guo Ümit Budak Abdulkadir Sengür Florentin Smarandache

A fundus image is an effective tool for ophthalmologists studying eye diseases. Retinal vessel detection is a significant task in the identification of retinal disease regions. This study presents a retinal vessel detection approach using shearlet transform and indeterminacy filtering. The fundus image’s green channel is mapped in the neutrosophic domain via shearlet transform. The neutrosophic...

2017
Yonghong He Jianjun Zhu Haiqiang Fu Qinghua Xie Bing Xu Bing Zhang

This paper presents a new filtering approach for Synthetic Aperture Radar (SAR) interferometric phase noise reduction in the shearlet domain, depending on the coherent statistical characteristics. Shearlets provide a multidirectional and multiscale decomposition that have advantages over wavelet filtering methods when dealing with noisy phase fringes. Phase noise in SAR interferograms is direct...

Journal: :DEStech Transactions on Engineering and Technology Research 2016

Journal: :Journal of Nonlinear Sciences and Applications 2016

Journal: :EURASIP J. Adv. Sig. Proc. 2014
Shuaiqi Liu Shaohai Hu Mingzhu Shi Zhong Zhang Shuang Liu

This paper first proposes a novel image separation method based on the hyperanalytic shearlet. By combining the advantages of both the hyperanalytic wavelet transform and the shear operation, hyperanalytic shearlet is easy to implement and also has a low redundancy. By using such transform and the orthonormal wavelet, a new geometric separation dictionary is obtained which can sparsely represen...

Journal: :Constructive Approximation 2021

Sobolev wavefront sets and 2-microlocal spaces play a key role in describing analyzing the singularities of distributions microlocal analysis solutions partial differential equations. Employing continuous shearlet transform to spaces, this paper we characterize sets, local Hölder distributions/functions. We then establish connections among through transform.

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