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| [img,map]=imread('del.bmp');
img1=img;
figure,imshow(img,map)
taille=size(img);
watermark=14;
for i=1:1:taille(1,1)
for j=1:2:taille(1,2)
bit=rem(watermark,2);
watermark=fix(watermark/2);
l=floor(img(i,j)+img(i,j+1)/2);
h=img(i,j)-img(i,j+1);
hbis=h*2+bit;
ligne=l+floor((hbis+1)/2);
if h>25
if ligne<256
img(i,j)=ligne;
end
cologne=l-floor(hbis/2);
if cologne<256
img(i,j+1)=cologne;
end
end
end
end
img-img1
imwrite(img,map,'hsml.gif')
figure,imshow(img,map) |
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