feimang.m

实现小波数字水印

clc;
n=25;
h=imread('lena.jpg');
imshow(h)
h=double(h);
[CH LH]=wavedec2(h,3,'haar');
g=CH;
w=imread('ma.bmp');
imshow(w)
w=double(w);
% w=w/256;
w=reshape(w,1,20*20);
% for i=1:20*20
%     if CH(i) >= 0
%        CH(i)=n*(fix(CH(i)/n)+w(i));
%     else
%        CH(i)=n*(fix(CH(i)/n)-w(i));
%     end
% end
for i=1:20*20
    CH(i)=g(i)+w(i)/n;
end
h=waverec2(CH,LH,'haar');
h=uint8(h);
figure
imshow(h)
h=double(h);
[CH LH]=wavedec2(h,3,'haar');
% for i=1:20*20
%     if CH(i) >= 0
%         w(i)=CH(i)/n-fix(CH(i)/n);
%     else
%         w(i)=fix(CH(i)/n)-CH(i)/n;
%     end
% end
for i=1:20*20
    w(i)=n*(CH(i)-g(i));
end
w=reshape(w,20,20);
% w=w*256;
w=uint8(w);
figure
imshow(w)