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 endWatermarked_img = idwt2(ncA,ncH,ncV,ncD,Lo_R,Hi_R);
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