نتایج جستجو برای: nonsubsampled contourlet transform

تعداد نتایج: 115108  

Journal: :Journal of Multimedia 2009
Xinsheng Zhang Hua Xie

In this paper, a novel algorithm for mammographic images enhancement and denoising based on Multiscale Geometric Analysis (MGA) is proposed. Firstly mammograms are decomposed into different scales and directional subbands using Nonsubsampled Contourlet Transform (NSCT). After modeling the coefficients of each directional subbands using Generalized Gaussian Mixture Model (GGMM) according to the ...

2015
Guocheng Yang Leiting Chen Meiling Li

Multimodal medical image fusion technique plays an important role in clinical applications, such as pathologic diagnosis and surgical options. However, many traditional fusion methods cannot well preserve details of source images in the fused image. To address this problem, a detail-enhanced image fusion scheme based on nonsubsampled contourlet transform (NSCT) and gain control (i.e., NCGC) is ...

Journal: :IEEE Access 2021

Noise reduction is important for X-ray images because it can reduce radiation exposure to patients. image noise has a Poisson-Gaussian distribution, and recently, analysis removal in multiscale transformations have been widely implemented. The nonsubsampled contourlet transform (NSCT) transformation suitable medical that separates the scale direction. This study proposes noise-removal method us...

2014
SHUANG LIANG TING LI

Contourlet is one of the new topics in image processing and video processing. Besides a lot of theoretical works about contourlet transform, its applications have roused enough interest as a critical means of multi-scale geometric analysis. This article, focusing on camera sabotage detection, extends the application of contourlet transform to video processing. A new algorithm to detect camera s...

2014
Yong Yang Song Tong Shuying Huang Pan Lin

Multimodal medical image fusion is a powerful tool in clinical applications such as noninvasive diagnosis, image-guided radiotherapy, and treatment planning. In this paper, a novel nonsubsampled Contourlet transform (NSCT) based method for multimodal medical image fusion is presented, which is approximately shift invariant and can effectively suppress the pseudo-Gibbs phenomena. The source medi...

2005
Yanjun Yan Lisa Osadciw

− The contourlet transform consists of two modules: the Laplacian Pyramid and the Directional Filter Bank. When both of them use perfect reconstruction filters, the contourlet expansion and reconstruction is a perfect dual. Therefore, the contourlet transform can be employed as a coding scheme. The contourlet coefficients derived above can be transmitted through the wireless channel in the same...

2005
P. Vetrivelan Subha Rani

Wavelet transforms are not capable of reconstructing curved images perfectly, hence we go for this new concept, called Contourlet Transform. It is a multiresolution and directional decomposition of a signal using a combination of Laplacian Pyramid (LP) and a Directional Filter Bank (DFB). The Contourlet transform has good approximation properties for smooth 2D functions and finds a direct discr...

2009
A. Vasuki P. T. Vanathi

This paper proposes a novel progressive image compression algorithm using the nonlinear contourlet transform. Contourlets are effective in capturing directional information in images using a flexible set of basis functions that are elongated and directional. Since the contourlet transform is redundant, a wavelet based contourlet transform has been applied on the image. The wavelet based contour...

2016
J N V R Swarup Kumar

--The paper presents the lossless image compression based on prediction and contourlet transform methods in image processing. The lossless compression usually a less bandwidth or less memory and low compression ratio at the cost of image quality degradation. In the paper presents prediction and Contourlet transform methods are used. In prediction method, convert the color image to YVU and then ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید