fitting image blocks

Question

ramya raj 2012-3-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31019-fitting-image-blocks

now i am doing a project for image hiding

and the steps involved are

1. divide the host image into blocks 2.divide the secret image into blocks i have taken 128X128 image and the block size is 32 hence i get 8 X 8 host image blocks and secret image blocks

3. i find the standard deviation and mean of each blocks of both the host and secret image 4 i sort the image blocks of host and secret image based on the average standard deviation of each block

5 map the blocks of the secret and host images in one to one manner and reorder the blocks based on the indices of the secret block 6 fit the secret image block to target image block

*i don't know how to map reorder and fit the secret image blocks to target image blocks * this is my code

clc;
clear all;
target=imread('D:\10mcs010\imagedb\flowerpottargetsmall.png');
figure,imshow(target);
bs=32;
[row,col,n]=size(target);
tarbk = mat2cell(target,ones(row/bs,1)*bs,ones(col/bs,1)*bs,3);
 [r,c,n]=size(tarbk);
for i=1:r
    for j=1:c
%   figure,imshow(tarbk{i,j})
%     tarbkseg{i,j}=tarbk{i,j};
%   tarbkred(i,j)=tarbk(i,j,:);
%   tarbkm(:)=cell2mat(tarbk(i,j));
  red(:,:,i,j)=tarbk{i,j}(:,:,1);
 green(:,:,i,j)=tarbk{i,j}(:,:,2);
 blue(:,:,i,j)=tarbk{i,j}(:,:,3);
    end
end
% 
for i=1:r
    for j=1:c
        redmean(:,:,i,j)=mean2(red(:,:,i,j));
        greenmean(:,:,i,j)=mean2(green(:,:,i,j));
        bluemean(:,:,i,j)=mean2(blue(:,:,i,j));
    end
end
for i=1:r
    for j=1:c
        stdred(:,:,i,j)=std2(red(:,:,i,j));
        stdgreen(:,:,i,j)=std2(green(:,:,i,j));
        stdblue(:,:,i,j)=std2(blue(:,:,i,j));
        avgtar(:,:,i,j)=(stdred(:,:,i,j)+stdgreen(:,:,i,j)+stdblue(:,:,i,j))/3;
    end
end
[value,index]=sort(avgtar);
% 
secret= imread('D:\10mcs010\imagedb\flowerpotsmall.png');
figure,imshow(secret);
 bs =32 ; % size of the block
[row,col,n]=size(secret);
secbk = mat2cell(secret,ones(row/bs,1)*bs,ones(col/bs,1)*bs,3);
[r,c]=size(secbk);
for i=1:r
    for j=1:c
%        figure,imshow(out{i,j})
        secred(:,:,i,j)=secbk{i,j}(:,:,1);
        secgreen(:,:,i,j)=secbk{i,j}(:,:,2);
        secblue(:,:,i,j)=secbk{i,j}(:,:,3);
    end
end
for i=1:r
    for j=1:c
        secredmean(:,:,i,j)=mean2(secred(:,:,i,j));
        secgreenmean(:,:,i,j)=mean2(secgreen(:,:,i,j));
        secbluemean(:,:,i,j)=mean2(secblue(:,:,i,j));
    end
end
% 
for i=1:r
    for j=1:c
        secstdred(:,:,i,j)=std2(secred(:,:,i,j));
        secstdgreen(:,:,i,j)=std2(secgreen(:,:,i,j));
        secstdblue(:,:,i,j)=std2(secblue(:,:,i,j));
        avgsec(:,:,i,j)=(secstdred(:,:,i,j)+secstdgreen(:,:,i,j)+secstdblue(:,:,i,j))/3;
    end
end
[values,indexs]=sort(avgsec);