dwt 源码搜索结果, 第92页, Verysource

Image coding based on integer wavelet and embedded optimal coef ... ... could offer the lower computational complexity and the less storage spending for image compression than the discrete wavelet transform (DWT). But the most coefficients of the IWT image have smaller dynamic change ranges than discrete wavelet transform. In ...
A multiclassifier and decision fusion system for hyperspectral i... ... (i.e., the 'LLL' subband) is deficient in exploiting useful information, all eight subbands (LLL, LLH, LHL, LHH, HLL, HLH, HHL, HHH) from a single-level, dyadic 3D DWT are first fused to overcome the small-sample-size problem. The stu
变采样率的磁共振图像分块压缩感知 ... 变化的快慢自适应分配采样率,获取测量数据,采用平滑投影Landweber(SPL,smooth projected Landweber)算法实现GOP的高质量压缩感知(CS)重构。实验结果表明,Tetrolet变换适用于MR图像的稀疏表示,相较于采用离散余弦变换(DCT)及双树小波变换(DWT)的方法,本文的重构图像的PSNR平均提高了0.92dB与2.06dB;而且对于不同的GOP,采用变采样率方案时,重构图像的质量均优于固定采样率时所得到的结果,为MR图像的CS提供了一种可行的解决方案。
基于多通道体全息相关器的二维离散沃尔什变换利用体全息相关器(VHC)可以完成多通道内积运算的特性,通过将待变换函数和二维沃尔什(Walsh)函数分别编码成输入图像和存储图像,提出了一种基于多通道体全息相关器的二维离散Walsh变换(DWT)方法。此方法可以快速、并行对输入函数做二维离散Walsh变换,并具有很大的速度提升潜力。利用散斑调制和随机交错方法可以提高运算精度。经验证,实验结果与理论值吻合。
An optimal adaptive quantization index modulation watermarking a... A novel adaptive watermarking algorithm in discrete wavelet transform (DWT) based on quantization index modulation (QIM) technique is presented. The host image is decomposed into wavelet subbands, and then the approximation subband is divided into non- ...
基于维纳滤波反卷积的光声成像 ... 方法, 利用点光声源获得超声探头的脉冲响应。利用维纳滤波抑制反卷积过程中噪声的影响, 滤波器参数由离散小波变换（DWT）动态估计, 样品光声图像由时域后向投影算法重建。数值模拟与成像实验均表明该方法有效地抑制了噪声对反卷 ...
Detection of Alzheimer's disease and mild cognitive impairment b... Detection of Alzheimer's disease and mild cognitive impairment based on structural volumetric MR images using 3D-DWT and WTA-KSVM trained by PSOTVAC
Hyperspectral image compression using three-dimensional signific... ... wavelet coder based on 3D significance tree splitting is proposed for hyperspectral image compression. 3D discrete wavelet transform (DWT) is applied to explore the spatial and spectral correlations. Then the 3D significance tree structure is constructed ...
Use of wavelet in specifying optics ... to eliminate certain frequency segment error. In order to solve this problem, two-dimensional discrete wavelet transform (2D-DWT) is used to separate frequency segment error and detect the corresponding region of certain frequency segment error, which is ...
激光大气闪烁的小波频谱分析激光对数光强起伏的快速傅里叶变换功率谱的无标度区间的标度指数在许多情况下很不稳定, 并且超出了理论界限, 因而本文引入了离散小波变换(DWT)频谱分析。通过对1/f信号的快速傅里叶变换频谱和离散小波变换频谱的对比分析, 验证了离散小波变换频谱分析的优越性。激光大气闪烁的离散小波变换频谱的无标度区间的标度指数在一天内(除日出后和日落前两段时间外)的变化比较稳定, 并且不超出理论界限。这些结果表明, 对于一般大气湍流中的激光闪烁的频谱分析应使用离散小波变换代替快速傅里叶变换。

关键字：dwt