How do you convert an invisible watermark to visible watermark in DCT domain??

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kirk
kirk 2013-4-3
x=1;
y=1;
for (kk = 1:length(message_pad))
dct_block=dct2(cover_object(y:y+blocksize-1,x:x+blocksize-1));
if (message_pad(kk) == 0)
if (dct_block(5,2) < dct_block(4,3))
temp=dct_block(4,3);
dct_block(4,3)=dct_block(5,2);
dct_block(5,2)=temp;
end
elseif (message_pad(kk) == 1)
if (dct_block(5,2) >= dct_block(4,3))
temp=dct_block(4,3);
dct_block(4,3)=dct_block(5,2);
dct_block(5,2)=temp;
end
end
if dct_block(5,2) > dct_block(4,3)
if dct_block(5,2) - dct_block(4,3) < k
dct_block(5,2)=dct_block(5,2)+(k/2);
dct_block(4,3)=dct_block(4,3)-(k/2);
end
else
if dct_block(4,3) - dct_block(5,2) < k
dct_block(4,3)=dct_block(4,3)+(k/2);
dct_block(5,2)=dct_block(5,2)-(k/2);
end
end
watermarked_image(y:y+blocksize-1,x:x+blocksize-1)=idct2(dct_block);
if (x+blocksize) >= Nc
x=1;
y=y+blocksize;
else x=x+blocksize;
end
end

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