搜索结果: 1-15 共查到“工学 CURVELET”相关记录25条 . 查询时间(0.068 秒)
针对小波难以表达煤岩图像的边缘曲线特征，影响识别精度的问题，提出一种基于曲波变换的方法，对煤岩图像边缘进行稀疏表示。该方法通过曲波变换对煤岩图像进行曲波分解，得到各尺度层曲波系数,保留图像变换后的Coarse层低频系数，基于压缩感知理论，利用随机高斯矩阵对高频系数进行测量，实现高维系数降维，Coarse层低频系数与降维后的高频系数通过级联构成煤岩图像特征向量，最后结合支持向量机对煤岩图像进行分类识...
Research and Application of Image Denoising Method Based on Curvelet Transform
IMAGE DENOISING CURVELET SAR APPLICATION
2015/12/2
The images usually bring different kinds of noises in process of receiving, coding and transmission. The curvelet transform is one kind of new multi-scale transform after 1999 that is based on wavelet...
Recovering Edges in Ill-Posed Inverse Problems:Optimality of Curvelet Frames
Ill-Posed Inverse Problems Regularization Singular Value Decomposition Radon Transform Deconvolution Edge Edge-Preserving Regularization Wavelets Curvelets Ridgelets Wavelet-Vaguelette-Decomposition Wavelet Shrinkage Minimax Estimation Optimal Rates of Convergence White Noise Model
2015/6/17
We consider a model problem of recovering a function f(x1, x2) from noisy Radon data. The function f to be recovered is assumed smooth apart from a discontinuity along a C2 curve – i.e. an edge. We us...
Gray and Color Image Contrast Enhancement by the Curvelet Transform
Contrast enhancement curvelets ridgelets wavelets
2015/6/17
We present in this paper a new method for contrast enhancement based on the curvelet transform. The curvelet transform represents edges better than wavelets, and is therefore well-suited for multiscal...
Astronomical Image Representation by the Curvelet Transform
methods Data Analysis-techniques Image Processing
2015/6/17
We outline digital implementations of two newly developed multiscale representation systems, namely, the ridgelet and curvelet transforms. We apply these digital transforms to the problem of restoring...
THE CURVELET TRANSFORM FOR IMAGE FUSION
Fusion Multiresolution analysis IKONOS Wavelet transform Curvelet transform
2015/5/27
The fusion of high-spectral but low spatial resolution multispectral and low-spectral but high spatial resolution panchromatic satellite images is a very useful technique in various applications of re...
Noise Filtering of Remotely Sensed Images using Iterative Thresholding of Wavelet and Curvelet Transforms
Multi-resolution analysis wavelet transform curvelet transform additive noise noise filtering fixed thresholding iterative thresholding
2014/12/4
This article presents techniques for noise filtering of remotely sensed images based on Multi-resolution Analysis (MRA). Multiresolution techniques provide a coarse-to-fine and scale-invariant decompo...
能否保持修复后图像的结构连贯性和邻域一致性决定了修复性能的优劣.为提高现有样本块修复算法性能,本文提出基于Curvelet变换的样本块图像修复算法.首先利用Curvelet变换估计待修复图像的4方向特征.然后利用颜色信息与方向信息共同衡量样本块间的相似度,在此基础上构造颜色-方向结构稀疏度函数.同时根据构造的加权颜色-方向距离寻找合适的多个匹配块,并利用多个匹配块在构造的颜色和方向空间内的邻域一致...
Comparison of wavelet, Gabor and curvelet transform for face recognition
wavelet transform Gabor wavelet curvelet transform face recognition multiscale analysis
2011/5/5
There has been much research about using Gabor wavelet for face recognition. Other multiscale
geometrical tools, such as curvelet and contourlet, have also been used for face recognition, thus
it is...
提出了基于二代Curvelet变换的红外与彩色可见光图像的融合算法。首先对彩色可见光图像进行IV1V2颜色空间变换提取亮度分量，然后对彩色图像的亮度分量和红外图像应用Curvelet变换，对低频系数应用亮度重映射技术后采用加权平均的融合规则，高频系数则采用取大融合规则，再对融合系数应用Curvelet逆变换获得融合图像的亮度分量，最后运用颜色空间逆变换得到融合图像。实验对比表明，相对于对传统融合算...
应用邻域方差加权平均的curvelet变换融合
图像融合 曲波变换 邻域方差
2010/3/26
提出一种基于邻域方差加权平均的多源遥感图像曲波变换融合方法。将低分辨率的多光谱图像和高分辨率的全色图像作曲波变换，融合图像的曲波系数中的低频分量取多光谱图像的低频分量，中高频系数与高频系数采用邻域方差加权平均的方法由两幅图像曲波变换系数共同决定。逆曲波变换得到融合图像。实验表明算法有效提高了图像的清晰度和保持了光谱特性。
Curvelet变换在多聚焦图像融合中的应用
多聚焦图像 Curvelet变换 图像融合 融合规则
2010/3/15
综合分析Curvelet变换的特性，提出一种基于Curvelet变换的多传感器图像融合算法。首先将图像进行Curvelet变换，然后基于子块区域方差和区域能量对图像的低频系数和高频系数采用不同的融合规则将Curvelet系数融合，最后进行重构得到融合结果。对该方法得到的融合图像进行了主客观评价和对比。实验结果表明，该方法得到的融合图像在图像边缘等细节上比传统方法和小波算法得到的图像具有更好的视觉效...
第二代Curvelet变换在低剂量CT图像增强中的应用
Curvelet变换 图像增强 低剂量CT
2010/3/1
低剂量CT图像信噪比低，图像对比度差。对婴幼儿低剂量颅脑CT图像应用第二代Curvelet变换，分别对低频子带进行非线性增强、对高频子带应用自适应域值方法进行去噪后再进行非线性增强，再经Cuverlet反变换后，其结果与小波变换增强及直方图均衡增强的结果进行比较。结果显示第二代Curvelet变换增强图像对比度及信噪比明显提高，图像细节显示清晰，效果良好。
基于第二代Curvelet变换的多聚焦图像融合
第二代Curvelet 多聚焦图像 图像融合
2012/5/21
将第二代 Ｃ ｕ ｒ ｖ ｅ ｌ ｅ ｔ 变换引入图像融合领域。选取目前有代表性的融合规则进行大量实验， 并用峰值信噪比 （ Ｐ Ｓ Ｎ Ｒ ） 和均方误差（ ＭＳ Ｅ ） 进行定量分析与比较。实验表明， 采用适合的 Ｃ ｕ ｒ ｖ ｅ ｌ ｅ ｔ 变换融合算法具有更强的细节 获取能力， 融合效果优于采用各种融合规则的小波分解融合算法。特别是采用基于边缘的融合规则时 Ｃ ｕ ｒ ｖ ｅ ｌ ｅ ｔ...