clear all;close all;
  Ximage=double(imread('e:\work\F1.BMP'));
%  Ximage=double(imread('E:\work\lena.jpg'));%待隱藏圖像
% Zimage=double(imread('E:\work\House.jpg'));
n=1;
% times=2;
%  key0=0.1;
 x=2;
 kk=0.1;
 k0=4;

M=size(Ximage,1);
N=size(Ximage,2);
figure(1)
imshow(Ximage,[]);
% Z=Zimage;
tt=1



     for(j=1:M*N*n)
          kk=k0*kk*(1-kk);
%         kk=1-x*kk*kk;
          key1(j)=kk;
     end

    key2=key1;
    key2=round(key2*256);
%     for(j=1:M*N*n)
%          key2(j)=key2(j)*255;
% %         key2(j)=abs(key2(j)*255);
%     end
%     for(i=1:M)
%         for(j=1:N)
%              XX(tt)=Ximage(i,j);
% %              key2(tt)=Zimage(i,j);
%             tt=tt+1;
%         end
%     end
XX=reshape(Ximage,1,M*N);
%      Z=bitand(XX,key2);
    for(j=1:M*N*n)
        Z(j)=double(bitxor(XX(j),key2(j)));
%        subplots(149);
%         imshow(Z)
    end
    ZZ=reshape(Z,M,N);

figure(2)
Imshow(ZZ,[]);
ZZ1=uint8(ZZ);
% jgimage=ZZ;
jgimage1=imnoise(ZZ1,'salt & pepper',0.02);
jgimage=double(jgimage1);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%    恢     復(fù)   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% 
% for i=1:M*N*n
%         if Z(i)==1
%             if key2(i)==1
%             XX(i)=0;
%             elseif key2(i)==0
%             XX(i)=1
%             end
%         end
%         
% 
%     if Z(i)==0
%         if key2(i)==0
%         XX(i)=0;
%     elseif key2(i)==1
%         XX(i)=0;
%         end
%     end
% end
n=1;
 kk=0.1;
 k0=4;
  for(j=1:M*N*n)
          kk=k0*kk*(1-kk);
%         kk=1-x*kk*kk;
          key1(j)=kk;
     end
    key2=key1;
    key2=round(key2*256);
ZZZ=reshape(jgimage,1,M*N);
for(j=1:M*N*n)
        Zimage(j)=double(bitxor(ZZZ(j),key2(j)));

    end
Himage=reshape(Zimage,M,N);
% Q=imrotate(QQ,270,'bilinear');
figure(3)
Imshow(Himage,[]);