WebAn algorithm for a sharpness evaluation of microscopic images based on non-subsampled shearlet wave transform (NSST) and variance is proposed in the present study for the purpose of improving the noise immunity and accuracy of a microscope’s image autofocus. First, images are decomposed with the NSST algorithm; then, the decomposed sub-band … WebApr 5, 2024 · Next, the discrete Shearlet transform is used to extract the main features of the images such as texture, color, and structure, which are then merged to produce vectors. Lastly, DCNN and RBFNN are ...
Sparse Directional Image Representations using the Discrete …
WebJun 1, 2024 · Adaptive threshold based shearlet transform denoising. An appropriate threshold is the crucial factor in surface microseismic processing to suppress random noise effectively. Firstly, we utilize SURE (Stein's unbiased risk estimate) to calculate t. Then, the noise standard deviation σ of each direction subband is estimated by the median formula. WebJul 1, 2008 · The shearlet transform results exhibits less Gibbs-type residual artifacts than the other denoising methods. We attribute this to the small support sizes of the … tea2016aat datasheet
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Web吴冬鹏，毕笃彦，马时平，何林远，张 跃. . 边缘和对比度增强的nsst域红外与可见光图像融合. 吴冬鹏1，毕笃彦1，马时平1，何林远1，张 跃2 Shearlets are constructed by parabolic scaling, shearing, and translation applied to a few generating functions. At fine scales, they are essentially supported within skinny and directional ridges following the parabolic scaling law, which reads length² ≈ width. See more In applied mathematical analysis, shearlets are a multiscale framework which allows efficient encoding of anisotropic features in multivariate problem classes. Originally, shearlets were introduced in 2006 … See more Let $${\displaystyle \psi _{1}\in L^{2}(\mathbb {R} )}$$ be a function satisfying the discrete Calderón condition, i.e., See more • Image processing and computer sciences • PDEs • Coorbit theory, characterization of smoothness spaces See more • 3D-Shearlets • $${\displaystyle \alpha }$$-Shearlets • Parabolic molecules See more Continuous shearlet systems The construction of continuous shearlet systems is based on parabolic scaling matrices One drawback of shearlets defined as above is the directional bias of shearlet elements associated with large shearing parameters. This effect is already recognizable in the frequency tiling of classical shearlets (see Figure in Section #Examples), where … See more • Wavelet transform • Curvelet transform • Contourlet transform See more WebDec 1, 2024 · In this paper, we present a discrete shearlet transf orm (DST)-based denoising conv olutional network (DSTnet). The The proposed method first … bristan java shower