带DWT的Matlab问题
带DWT的Matlab问题
提问于 2011-06-12 14:36:25
我试图得到一个图像的第4级DWT使用10点daubechies滤波器。(自然倒置！)
host = double(imread('lena512.bmp')); % Load image data
nLevel = 4; % Number of decompositions
cwA = cell(1,nLevel); % Approximation coefficients
cwH = cell(1,nLevel); % Horizontal detail coefficients
cwV = cell(1,nLevel); % Vertical detail coefficients
cwD = cell(1,nLevel); % Diagonal detail coefficients
% Do the DWT
myImage = host;
for iLevel = 1:nLevel,
[cwA{iLevel},cwH{iLevel},cwV{iLevel},cwD{iLevel}] = dwt2(myImage,'db10');
myImage = cwA{iLevel};
end
% Do the inverse DWT
fullRecon = cA{nLevel};
for iLevel = nLevel:-1:1
fullRecon = idwt2(fullRecon,cH{iLevel},cV{iLevel},cD{iLevel},'db10');
end上面的代码一直给我错误：
？使用==> +矩阵尺寸的错误必须一致。
==> idwt2在93 x= upsconv2(a，{Lo_R，Lo_R}，sx，dwtEXTM，shift)+ .%近似时的误差。
在18 fullRecon = idwt2(fullRecon，cH{iLevel}，cV{iLevel}，cD{iLevel}，‘db10’)处出错；
我相信，这是因为逆dwt做了一些古怪的事情。我也试过改变dwtmode，但没什么用。我真的很乐意接受任何帮助。
PS: lena512.bmp只是莉娜的一张灰色照片。它的尺寸是512×512。
我愿意接受新的想法
回答 1
Stack Overflow用户
发布于 2011-06-12 22:36:34
将代码重写为
clear all;
host = double(imread('lena512.bmp')); % Load image data
nLevel = 4; % Number of decompositions
cwA = cell(1,nLevel); % Approximation coefficients
cwH = cell(1,nLevel); % Horizontal detail coefficients
cwV = cell(1,nLevel); % Vertical detail coefficients
cwD = cell(1,nLevel); % Diagonal detail coefficients
% Size matrix
s = [size(host,1) size(host,2)];
% Do the DWT
myImage = host ;
for iLevel = 1:nLevel
[cwA{iLevel},cwH{iLevel},cwV{iLevel},cwD{iLevel}] = dwt2(myImage, 'db10');
s = [s; size(cwH{iLevel},1) size(cwH{iLevel},2)];
myImage = cwA{iLevel};
end
% Do the inverse DWT
fullRecon = cwA{nLevel};
for iLevel = nLevel:-1:1
fullRecon = idwt2(fullRecon,cwH{iLevel},cwV{iLevel},cwD{iLevel},'db10',s(iLevel,:));
end解决了我的问题。希望它能帮助别人..。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/6322512
复制相关文章
相似问题
腾讯云开发者
