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Help embedding secret message using lwt ,cannot extract the secret message correctly
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please help me..here is the code that i used for embedding and extracting
and the output was as follows..
embed
1101000
extracted binary
000000
cover=imread('frame1.jpg');
els = {'p',[-0.125 0.125],0};
lshaarInt = liftwave('haar','int2int');
lsnewInt = addlift(lshaarInt,els);
[LL,LH,HL,HH] = lwt2(double(cover),lsnewInt);
dec=[...
LL,LH
HL,HH
...
];
%figure;imshow(dec,[]);title ('IWT');
secret='h';
secret_bin=dec2bin(secret);
disp(secret_bin);
secret_bin=secret_bin';
length_secret = size(secret_bin,1)*size(secret_bin,2);
length_LH = size(LH,2);
c = 1;
% embedding the secret_bin in the last signficant bit of each CA ( 1 LSB
of CA )
for b = 1:1:length_LH
if b <= length_secret
xb=LH(1,c);
if xb < 0
xb= abs(xb);
if strcmp(secret_bin(b), '0')
xb=bitset(xb,1,0);
else
xb=bitset(xb,1,1);
end
LH(1,c)=-xb;
else
if strcmp(secret_bin(b), '0')
LH(1,c) = bitset(LH(1,c),1,0);
else
LH(1,c) = bitset(LH(1,c),1,1);
end
end% end if xb<0
c = c+ 1;
if (c > length_LH)
c = 1;
end
end % if b <= length_secret
end % end for loop b=8:-1:1
stego = uint8(ilwt2(LL,LH,HL,HH,lsnewInt));
imwrite((stego),'stegoi.jpg','jpg');
figure;
imshow((stego));title('EMBEDDED OUTPUT');
%extraction
Stegoi = imread('stegoi.jpg');
els = {'p',[-0.125 0.125],0};
lshaarInt = liftwave('haar','int2int');
[LL_ex,LH_ex,HL_ex,HH_ex] = lwt2(double(Stegoi),lsnewInt);
dec=[...
LL_ex,LH_ex
HL_ex,HH_ex
...
];
length_LH_ex = size(LH_ex,2);
c = 1;
secret_bits_ex = zeros(1,length_secret);
for b = 1:1:length_LH_ex
if b <= length_secret
xb=LH_ex(1,c);
if xb < 0
xb= abs(xb);
end
secret_bits_ex(b) = bitget(xb,1);
%letter = bitset(letter,b,bitget(xb,1));
c = c + 1;
end
end
%function i created
result=secret_bits_ex;
disp("extracted binary")
disp(result);
please help me
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