matlab代码实现灰度图像的编码问题Image1=imread('Lena.tiff');
w=imread('logo1.bmp');
w=double(w);
%xianshi;
number=input(' input the number:');
Image1=suoxiao('Lena.tiff',number);
[imagem imagen]=size(Image1);
Sr=4;Sd=8;
Rnum=(imagem/Sr)*(imagen/Sr);
Dnum=(imagem/Sd)*(imagen/Sd);
Image2=zeros(Dnum,Sr,Sr); %几行几列矩阵
Image2=blkproc(Image1,[Sd/Sr,Sd/Sr],'mean(mean(x))'); %把image图像分成[Sd/Sr,Sd/Sr]像素块进行mean（mean（x))变换
%压缩image1为原来1/2
% there are no eight tranformation for simpleness
RBlocks=zeros(Rnum,Sr,Sr);
DBlocks=zeros(Dnum,Sd,Sd);
DBlocksReduce=zeros(Dnum*8,Sr,Sr);
%%取R块，K记标号----------------------------------
for i=1:imagem/Sr
for j=1:imagen/Sr
k=(i-1)*imagen/Sr+j;
RBlocks(k,:,:)=Image1((i-1)*Sr+1:i*Sr,(j-1)*Sr+1:j*Sr);
end
end
%取R块，K记标号----------------------------------
for i=1:imagem/Sd
for j=1:imagen/Sd
k=(i-1)*imagen/Sd+j;
m=Sr;n=Sr;
DBlocksReduce(k,:,:)=Image2((i-1)*Sr+1:i*Sr,(j-1)*Sr+1:j*Sr);
DBlocksReduce(k+Dnum,:,:)=DBlocksReduce(k,m:-1:1,:); % 行上下翻转===(x轴对称)
DBlocksReduce(k+2*Dnum,:,:)=DBlocksReduce(k,:,n:-1:1); % 列左右翻转 ==== y轴对称
DBlocksReduce(k+3*Dnum,:,:)=DBlocksReduce(k,m:-1:1,n:-1:1); % 先行翻，再列翻 旋转180度
DBlocksReduce(k+4*Dnum,:,:)=reshape(DBlocksReduce(k,:,:),Sr,Sr)'; % 关于y=-x对称
A=reshape( DBlocksReduce(k+3*Dnum,:,:),Sr,Sr)';
DBlocksReduce(k+5*Dnum,:,:)=A(:,n:-1:1); % 关于y=x对称
DBlocksReduce(k+6*Dnum,:,:)=imrotate(reshape(DBlocksReduce(k,:,:),Sr,Sr),90); % 逆时针旋转90度
DBlocksReduce(k+7*Dnum,:,:)=imrotate(reshape(DBlocksReduce(k,:,:),Sr,Sr),270); % 逆时针旋转270度
DBlocks(k,:,:)=Image1((i-1)*Sd+1:i*Sd,(j-1)*Sd+1:j*Sd);
end
end
RandDbest=zeros(Rnum,1)+256^3;
RandDbests=zeros(Rnum,1);
RandDbesto=zeros(Rnum,1);
RandDbestj=zeros(Rnum,1);
RandDbestr=zeros(4096,1);%ri
RandDbestw=zeros(4096,1);%w是将水印分解后的数yi维数组
RandDbesta=zeros(4096,1);%a是参数
RandDbestrw=zeros(4096,1);%rw
RandDbestw1=zeros(4096,1);%w*是二维数组
RandDbestw2=zeros(64,64);%变为yi数组
