DWT matlab code for image watermarking

can any1 tell me the code for image watermarking for gray scale images in DWT domain ? i'm working on this. i've found many codes on net but they can't work properly.

[madhuri]

I have the same problem.I also want a running code for dwt and dwt-svd matlab code for my project work.plz help me as im in a gr8 need.my id is : [e-mail]

Answer 1

[ajith]

function [I_W , S] = func_DWT(I, level, Lo_D, Hi_D); % Matlab implementation of SPIHT (without Arithmatic coding stage) % % Wavelet decomposition % % input: I : input image % level : wavelet decomposition level % Lo_D : low-pass decomposition filter % Hi_D : high-pass decomposition filter % % output: I_W : decomposed image vector % S : corresponding bookkeeping matrix % % please refer wavedec2 function to see more

[C,S] = func_Mywavedec2(I,level,Lo_D,Hi_D);

S(:,3) = S(:,1).*S(:,2); % dim of detail coef nmatrices

L = length(S);

I_W = zeros(S(L,1),S(L,2));

% approx part I_W( 1:S(1,1) , 1:S(1,2) ) = reshape(C(1:S(1,3)),S(1,1:2));

for k = 2 : L-1 rows = [sum(S(1:k-1,1))+1:sum(S(1:k,1))]; columns = [sum(S(1:k-1,2))+1:sum(S(1:k,2))]; % horizontal part c_start = S(1,3) + 3*sum(S(2:k-1,3)) + 1; c_stop = S(1,3) + 3*sum(S(2:k-1,3)) + S(k,3); I_W( 1:S(k,1) , columns ) = reshape( C(c_start:c_stop) , S(k,1:2) );

    % vertical part
    c_start = S(1,3) + 3*sum(S(2:k-1,3)) + S(k,3) + 1;
    c_stop = S(1,3) + 3*sum(S(2:k-1,3)) + 2*S(k,3);
    I_W( rows , 1:S(k,2) ) = reshape( C(c_start:c_stop) , S(k,1:2) );

    % diagonal part
    c_start = S(1,3) + 3*sum(S(2:k-1,3)) + 2*S(k,3) + 1;
    c_stop = S(1,3) + 3*sum(S(2:k,3));
    I_W( rows , columns ) = reshape( C(c_start:c_stop) , S(k,1:2) );

end

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup