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How to detect watermarking in DWT~ Include matlab source~ please help me~~

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DoSeok Lee
DoSeok Lee 2015-6-25
关闭： Stephen23 2015-6-25
how to detect watermarking?? I don't know how about detecting watermarking code please help me! I successed insert watermarking but I can't exctract watermark
clear all; clc % read gray image gray_img = imread('body_1_gray256.jpg'); % convert double image gray_img = double(gray_img); init = 0.0001; %
% [p q] = size(gray_img);
% sign_img = imread('sign_image.jpg');
[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('haar');
[cA,cH,cV,cD] = dwt2(gray_img,Lo_D,Hi_D);
% watermarking start y = [cA cH;cV cD]; Y = y + init*abs(y).* double(sign_img); p=p/2;q=q/2; for i=1:p for j=1:q
ncA(i,j) = Y(i,j);
ncV(i,j) = Y(i+p,j);
ncH(i,j) = Y(i,j+q);
ncD(i,j) = Y(i+p,j+q);
end
end
Watermarked_img = idwt2(ncA,ncH,ncV,ncD,Lo_R,Hi_R);

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