embeding a image in a image in the frquency domain

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uthara ravi
uthara ravi 2016-6-7
评论： shimaa samy 2017-5-6
can any help me to correct this program. i tried to embed a copy right emblem image on a gray scale image in the frequency domain. i have done the embeding. its unable to extract. can anyone help me to debug this program.
clc;
clear all;
close all;
RONI=dicomread('189.dcm');
RONI = uint8(255*mat2gray(RONI));
% Display the Image
figure,imshow(RONI,[]);
title('input image');
wm=imread('images.jpg');
figure,imshow(wm);
%resizing the watermark image
out = bilinearInterpolation(wm, [256 256]);
% out=double(out);
figure;
imshow(out);
%integer wavelet lifting of host image
els = {'p',[-0.125 0.125],0};
lshaarInt = liftwave('haar','int2int');
lsnewInt = addlift(lshaarInt,els);
[LL,LH,HL,HH] = lwt2(double(RONI),lsnewInt);
figure,imshow(LH);
title(' LH band');
%watermark embedding
alpha=.05;
for i=1:256
for j=1:256
HL1(i,j)=double(HL(i,j))+alpha*((out(i,j)));
end
end
figure,imshow(HL1);
title(' wm band');
HL1=double(HL1);
%inverse lifting
stego = uint8(ilwt2(LL,LH,HL1,HH,lsnewInt));
figure,imshow(stego);
%extraction
%integer wavelet lifting of host image
els = {'p',[-0.125 0.125],0};
lshaarInt = liftwave('haar','int2int');
lsnewInt = addlift(lshaarInt,els);
[LL1,LH1,HL1,HH1] = lwt2(double(RONI),lsnewInt);
alpha=10;
for i=1:256
for j=1:256
w_extracted(i,j)=((HL(i,j)/HL1(i,j))-1)/alpha;
end
end
w_extracted=double(w_extracted);
figure,imshow(w_extracted);
  1 个评论
shimaa samy
shimaa samy 2017-5-6
did u find the solution ?...plz i need help in the problem..i can not extract the secret message

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