[转帖]二代小波harr变换，整数小波变换
%文件名：liftwavedec2.m%编 写：郭林庚
%时 间：2005/11/01
%函数功能：二代小波harr变换，整数小波变换
%输入格式举例：imgwave=liftwavedec2(image,256,3)
%参数说明：
% image--输入的图像矩阵，要为方阵
% m --输入的图像矩阵大小
% n --小波变换次数
%测试用例：
% img=imread('lena.jpg');
% =size(img);
% imgwave=liftwavedec2(img,m,3);
% imshow(imgwave);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function imgwave=liftwavedec2(image,m,n)
img=image;
M=m;
for i=1:n
imgwave1=lwavedec2(img,M);
imgwave(1:M,1:M)=imgwave1;
M=M/2;
img=imgwave1(1:M,1:M);
end
%
% 二代小波harr变换，整数小波变换
%
function f_row=lwavedec2(image,N)
f=image;
T=N/2; % 子图像维数
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% 1.列变换
% A.分裂（奇偶分开）
f1=f(,:); % 奇数
f2=f(,:); % 偶数
% f1(:,T+1)=f1(:,1); % 补列
% f2(T+1,:)=f2(1,:); % 补行
% B.预测
for i_hc=1:T;
high_frequency_column(i_hc,:)=f1(i_hc,:)-f2(i_hc,:);
end;
% high_frequency_column(T+1,:)=high_frequency_column(1,:); % 补行
% C.更新
for i_lc=1:T;
low_frequency_column(i_lc,:)=f2(i_lc,:)+1/2*high_frequency_column(i_lc,:);
end;
% D.合并
f_column(,:)=low_frequency_column(,:);
f_column(,:)=high_frequency_column(,:);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% 2.行变换
% A.分裂（奇偶分开）
f1=f_column(:,); % 奇数
f2=f_column(:,); % 偶数
% f2(:,T+1)=f2(:,1); % 补行
% B.预测
for i_hr=1:T;
high_frequency_row(:,i_hr)=f1(:,i_hr)-f2(:,i_hr);
end;
% high_frequency_row(:,T+1)=high_frequency_row(:,1); % 补行
% C.更新
for i_lr=1:T;
low_frequency_row(:,i_lr)=f2(:,i_lr)+1/2*high_frequency_row(:,i_lr);
end;
% D.合并
f_row(:,)=low_frequency_row(:,);
f_row(:,)=high_frequency_row(:,);
[ 本帖最后由 suffer 于 2006-10-9 20:04 编辑 ] function imgwave=liftwaverec2(image,m,n)
M=m/(2^n);
imgwave=image;
for i=n:-1:1
M=M*2;
img=imgwave(1:M,1:M);
imgwave1=lwaverec2(img,M);
imgwave(1:M,1:M)=imgwave1;
end
function f_column=lwaverec2(f_row,N);
T=N/2;
%figure(2);
%subplot(221),imshow(f_row),title('变换后图像');
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%反变换%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% 1.行变换
% A.提取（低频高频分开）
f1=f_row(:,); % 奇数
f2=f_row(:,); % 偶数
% f2(:,T+1)=f2(:,1); % 补行
% B.更新
for i_lr=1:T;
low_frequency_row(:,i_lr)=f2(:,i_lr)-1/2*f1(:,i_lr);
end;
% C.预测
for i_hr=1:T;
high_frequency_row(:,i_hr)=f1(:,i_hr)+low_frequency_row(:,i_hr);
end;
% high_frequency_row(:,T+1)=high_frequency_row(:,1); % 补行
% D.合并(奇偶分开合并)
f_row(:,)=low_frequency_row(:,);
f_row(:,)=high_frequency_row(:,);
%subplot(223),imshow(f_row),title('行变换图像');
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% 2.列变换
% A.提取（低频高频分开）
f1=f_row(,:); % 奇数
f2=f_row(,:); % 偶数
% f1(:,T+1)=f1(:,1); % 补列
% f2(T+1,:)=f2(1,:); % 补行
% B.更新
for i_lc=1:T;
low_frequency_column(i_lc,:)=f2(i_lc,:)-1/2*f1(i_lc,:);
end;
% C.预测
for i_hc=1:T;
high_frequency_column(i_hc,:)=f1(i_hc,:)+low_frequency_column(i_hc,:);
end;
% high_frequency_column(T+1,:)=high_frequency_column(1,:); % 补行
% D.合并(奇偶分开合并）
f_column(,:)=low_frequency_column(,:);
f_column(,:)=high_frequency_column(,:);
%subplot(224),imshow(f_column),title('行变换图像');
[ 本帖最后由 suffer 于 2006-10-9 20:05 编辑 ] 一楼代码有问题吗 ？？ 我在厌学论坛上看到过这个代码
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