sw2.m

这是偶自己的作品拉

function wadec2()
X=imread('E:\matlab1\LENAcaise128.bmp','bmp');
figure(100);imshow(uint8(X));title('original image');

Wavelet_Name='db1';
Wavelet_Scale=1;

[LL1,LH1,HL1,HH1]=swt2(double(X(:,:,1)),Wavelet_Scale,Wavelet_Name);
%[C,S]=wavedec2(double(X(:,:,1)),Wavelet_Scale,Wavelet_Name);
%appcoef2用来提取二维信号小波分解的近似分量
%LL1=appcoef2(C,S,Wavelet_Name,Wavelet_Scale);
%detcoef2用来提取二维信号小波分解的细节分量
%D=detcoef2(O,C,S,N)，O指定细节分量的类型，
%当O=‘h’时，重构水平细节分量，当O=‘v’时，重构垂直细节分量，当O=‘d’时，重构细节细节分量
%LH1=detcoef2('v',C,S,1);
%HL1=detcoef2('h',C,S,1);
%HH1=detcoef2('d',C,S,1);

%训练LL1频带码本，将码本大小设为128，维度为4 %
th=0.05;
nc=128;nd=4;
[cbLL1]=LBG(LL1,nc,nd,th); %LBG.m在L3.3节中
%训练LH1频带码本，将码本大小设为64，维度为4 %
nc=64;nd=4;
[cbLH1]=LBG(LH1,nc,nd,th);
%训练HL1频带码本，将码本大小设为64，维度为4 %
nc=64;nd=4;
[cbHL1]=LBG(HL1,nc,nd,th);
%训练HH1频带码本，将码本大小设为64，维度为16 %
nc=64;nd=16;
[cbHH1]=LBG(HH1,nc,nd,th);
%利用一层小波变换加上向量量化进行Lena图像压缩%
%输入一幅Lena图像%
X=imread('E:\matlab1\LENAcaise128.bmp','bmp');
%load lena
[M,N]=size(X(:,:,1));
%使用Matlab中Wavelet工具箱的周期性小波变换函数dwtper2.m%
%并使用双正交小波bior3.3进行一层小波变换%
%[LL1,LH1,HL1,HH1]=dwtper2(X,'bior3.3');
Wavelet_Name='db1';
Wavelet_Scale=1;
[LL1,LH1,HL1,HH1]=swt2(double(X(:,:,1)),Wavelet_Scale,Wavelet_Name);


%分别针对不同的频带进行向量量化，其中VQ.m置于L3.4节中%
[R_LL1,bitLL1]=VQ(LL1,cbLL1);
[R_LH1,bitLH1]=VQ(LH1,cbLH1);
[R_HL1,bitHL1]=VQ(HL1,cbHL1);
[R_HH1,bitHH1]=VQ(HH1,cbHH1);

%计算图像经过向量量化后的压缩率CR及失真PSNR%
totalbit=bitLL1+bitLH1+bitHL1+bitHH1    %花费的总位数
%Y=idwtper2(R_LL1,R_LH1,R_HL1,R_HH1,'bior3.3'); %反小波变换
%C1= [R_LL1 R_HL1 R_LH1 R_HH1];
%S1=S;
%Y1=waverec2(C1,S1,Wavelet_Name);
Y1=iswt2(LL1,HL1 ,LH1, HH1,'db1');
X(:,:,1)=Y1;


Wavelet_Name='db1';
Wavelet_Scale=1;
[LL2,LH2,HL2,HH2]=swt2(double(X(:,:,2)),Wavelet_Scale,Wavelet_Name);
%appcoef2用来提取二维信号小波分解的近似分量
%训练LL1频带码本，将码本大小设为128，维度为4 %
th=0.05;
nc=128;nd=4;
[cbLL2]=LBG(LL2,nc,nd,th); %LBG.m在L3.3节中
%训练LH1频带码本，将码本大小设为64，维度为4 %
nc=64;nd=4;
[cbLH2]=LBG(LH2,nc,nd,th);
%训练HL1频带码本，将码本大小设为64，维度为4 %
nc=64;nd=4;
[cbHL2]=LBG(HL2,nc,nd,th);
%训练HH1频带码本，将码本大小设为64，维度为16 %
nc=64;nd=16;
[cbHH2]=LBG(HH2,nc,nd,th);
%利用一层小波变换加上向量量化进行Lena图像压缩%
%输入一幅Lena图像%
X=imread('E:\matlab1\LENAcaise128.bmp','bmp');
%load lena
[M2,N2]=size(X(:,:,2));
%使用Matlab中Wavelet工具箱的周期性小波变换函数dwtper2.m%
%并使用双正交小波bior3.3进行一层小波变换%
%[LL1,LH1,HL1,HH1]=dwtper2(X,'bior3.3');

Wavelet_Name='db1';
Wavelet_Scale=1;

[LL2,LH2,HL2,HH2]=swt2(double(X(:,:,2)),Wavelet_Scale,Wavelet_Name);

%分别针对不同的频带进行向量量化，其中VQ.m置于L3.4节中%
[R_LL2,bitLL2]=VQ(LL2,cbLL2);
[R_LH2,bitLH2]=VQ(LH2,cbLH2);
[R_HL2,bitHL2]=VQ(HL2,cbHL2);
[R_HH2,bitHH2]=VQ(HH2,cbHH2);

%计算图像经过向量量化后的压缩率CR及失真PSNR%
totalbit2=bitLL2+bitLH2+bitHL2+bitHH2    %花费的总位数
%Y=idwtper2(R_LL1,R_LH1,R_HL1,R_HH1,'bior3.3'); %反小波变换
Y2=iswt2(R_LL2,R_HL2 ,R_LH2, R_HH2,'db1');
X(:,:,2)=Y2;


Wavelet_Name='db1';
Wavelet_Scale=1;
[LL3,LH3,HL3,HH3]=swt2(double(X(:,:,3)),Wavelet_Scale,Wavelet_Name);
%appcoef2用来提取二维信号小波分解的近似分量

%训练LL1频带码本，将码本大小设为128，维度为4 %
th=0.05;
nc=128;nd=4;
[cbLL3]=LBG(LL3,nc,nd,th); %LBG.m在L3.3节中
%训练LH1频带码本，将码本大小设为64，维度为4 %
nc=64;nd=4;
[cbLH3]=LBG(LH3,nc,nd,th);
%训练HL1频带码本，将码本大小设为64，维度为4 %
nc=64;nd=4;
[cbHL3]=LBG(HL3,nc,nd,th);
%训练HH1频带码本，将码本大小设为64，维度为16 %
nc=64;nd=16;
[cbHH3]=LBG(HH3,nc,nd,th);
%利用一层小波变换加上向量量化进行Lena图像压缩%
%输入一幅Lena图像%
X=imread('E:\matlab1\LENAcaise128.bmp','bmp');
%load lena
[M3,N3]=size(X(:,:,3));
%使用Matlab中Wavelet工具箱的周期性小波变换函数dwtper2.m%
%并使用双正交小波bior3.3进行一层小波变换%
%[LL1,LH1,HL1,HH1]=dwtper2(X,'bior3.3');
Wavelet_Name='db1';
Wavelet_Scale=1;
[LL3,LH3,HL3,HH3]=swt2(double(X(:,:,3)),Wavelet_Scale,Wavelet_Name);


%分别针对不同的频带进行向量量化，其中VQ.m置于L3.4节中%
[R_LL3,bitLL3]=VQ(LL3,cbLL3);
[R_LH3,bitLH3]=VQ(LH3,cbLH3);
[R_HL3,bitHL3]=VQ(HL3,cbHL3);
[R_HH3,bitHH3]=VQ(HH3,cbHH3);

%计算图像经过向量量化后的压缩率CR及失真PSNR%
totalbit3=bitLL3+bitLH3+bitHL3+bitHH3;    %花费的总位数
%Y=idwtper2(R_LL1,R_LH1,R_HL1,R_HH1,'bior3.3'); %反小波变换
Y3=iswt2(R_LL3,R_HL3 ,R_LH3, R_HH3,'db1');
X(:,:,3)=Y3;
RG1=cat(3,Y1,Y2,Y3);

MSE=(sum(sum((double(X(:,:,3))-double(RG1(:,:,3))).^2)))/(M*N)
PSNR=20*log10(255/sqrt(MSE))
CR2=M3*N3*8/totalbit2

figure(200);imshow(uint8(X));title('compressed image');
figure(300);imshow(uint8(RG1));title('compressed555 image');


%[LL1,LH1,HL1,HH1]=swt2(X,Wavelet_Scale,Wavelet_Name);