Question

我正在努力将文字隐藏到图片中..但我无法收到确切的短信..有人可以帮助我解决问题并弄错我的代码..价值我正在使用的是2.这里的代码如下：

clc;
close all; clear all;
clf;
cov_img=imread('pears.png');




cov_img1 =rgb2gray(cov_img);
cov_img1=imresize(cov_img1,[256 256]);
imshow(cov_img1);

k=input('enter no of bits ');
a='In this context, cryptography, steganography and water marking schemes play a vital role in establishing secret communication through encryption, hiding and embedding secret information in digital medium respectively. ';

 b=dec2bin(double(a),8);
 c=b(:);


 d=reshape(c,[],k);


e=bin2dec(d);
[m n]=size(e);


for i=1:256;
   for j=1:256;

     S(i,j)=cov_img1(i,j)-mod(cov_img1(i,j),2^k)+e(i,:);

     j=j+1;
   end
   i=i+1;
end

figure, imshow(S,[]);


 %%Extraction

 for i=1:256;
     for j=1:256;
         E(i,j)=mod(double(S(i,j)),2^k);
         j=j+1;
     end
     i=i+1;
 end


 e1=dec2bin(E,2);

 e2=e1';

 e3=reshape(e1,[],8);

 e4=bin2dec(e3);

 e5=char(e4);

 disp(e5)

[mse psnr]=msepsnr(cov_img1,S);
 disp('PSNR value is : ');
 disp(psnr);
 disp(' db');
 disp('MSE value is');
 disp(mse);
%%%%%%%

Answer 1

我不完全理解该方法，但是你不会得到完整的消息，因为e是长度872而我只运行到256.因此S将不包括你的完整消息。您也不需要在Matlab中的for循环中执行j = j + 1。以下对我有用（即使e的长度可能在e1的定义中未知）：

clc;
close all; clear all;
clf;
cov_img=imread('pears.png');

cov_img1 =rgb2gray(cov_img);
cov_img1=imresize(cov_img1,[256 256]);
imshow(cov_img1);

k=2;
a='In this context, cryptography, steganography and water marking schemes play a vital role in establishing secret communication through encryption, hiding and embedding secret information in digital medium respectively. ';
b=dec2bin(double(a),8);
c=b(:);
d=reshape(c,[],k);
e=bin2dec(d);
[m n]=size(e);

Z = zeros(256);
Z(1:length(e)) = e;
for i=1:256;
   for j=1:256;

     S(i,j)=cov_img1(i,j)-mod(cov_img1(i,j),2^k)+Z(i,j);

   end

end
figure, imshow(S,[]);
 %%Extraction
 for i=1:256;
     for j=1:256;
         E(i,j)=mod(double(S(i,j)),2^k)';

     end

 end
 e1=dec2bin(E(1:length(e)),2);
 e2=e1;
 e3=reshape(e2,[],8);
 e4=bin2dec(e3);
 e5=char(e4);
disp(e5')

恢复隐藏在图像中的文本时出错

1 个答案: