I m working on the project "wavelet based watermarking". am using the dwt2
function to get the approximation parameter. while doing so.. Iam losing the
color of the watermarked image.
plzz help me out in obtaining the color component
Here is my code..
a=imread('H:\pics\earth_from_space.jpg');
%i=imread('earth_from_space.jpg');
%i=uigetfile( '*.*' , 'select the image');
%[filename1,pathname]=uigetfile( '*.*' , 'select the second
image');
i=imread('H:\pics\Tulips.jpg');
[row,col]=size(r);
Tr0;%%%% initializing the threshold
k=0.0025; %%% a constant value
[ca,ch,cv,cd] = dwt2(a,'db1');%%%% applying wavelets of
debeluecheis
c1 = [ch cv cd];%%% getting the high frequency vertical,diagnal,horizontal
details
[h, w] = size(ca');
[m, n] = size(c1');
%W=dmg(r,ri);
[caa chh cvv cdd]=dwt2(i,'db1'); %%%%% applying wavelets for the
secong image and estimating the horizontal vertical and
%diagnal details
W;
%size(ri);
cw= [chh cvv cdd]; chd=[chh cdd];
% Adding watermark image.
q=0.001
ca=imresize(ca,[size(W)]);
watwav=k*ca+q*W;
figure(3);
imshow(watwav);
title('image(watermarked) obtained using wavelet transforms');
[wa]=idwt2(watwav,chh,cvv,cdd,'db4',size(ca));%%%applying inverse
wavelet transforms
wa=imresize(ca,[size(wa)])
wa=watwav-k*ca;
figure(4),imshow(wa);
title('image2 obtained after reverse watermarking using wavelet
transforms');
caa=imresize(caa,size(watwav));
ca=watwav-wa;
figure(5),imshow(ca);
title('image1 obtained after reverse watermarking using wavelet
transforms');
%origt(ca);
%snr *log(orig);
%wattt(watwav);
%snwatt *log((watt));
%msewav=sum(sum((watt-orig).*(watt-orig)))/65536;
%PSNRwav *log10(sqrt(msewav)/255);
%k=watdet3(watermark,image1);
% watbpp2bin(watwav);
% [row col]=size(ca);
% bppwav=((numel(watwav))/row)/100;
% %%%%%% psnr for watermarked image using wavelets
% origt(double(r));
% snr *log(abs(orig));
% wattt(double(watwav));
% snwatt *log((watt));
% watt=imresize(watt,size(orig));
% mseti=sum(sum((watt-orig).*(watt-orig)))/65536;
% PSNRti *log10(sqrt(mseti)/255);
% %k=watdet3(watermark,image1);
% watbpp2bin(watwav);
% [row col]=size(r);
% bppti=((numel(watwav))/row)/100
a=rgb2gray(a);
a=imresize(a,size(watwav));
origt(abs(double(a)));
snr *log((orig));
wattt(abs(double(watwav)));
snwatt *log(abs(watt));
mse=sum((sum( (abs(watt-orig)).*abs(watt-orig)) ))/65535;
PSNRs(20*log10(255/sqrt(mse)))
