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

2 ビュー (過去 30 日間)
DoSeok Lee
DoSeok Lee 2015 年 6 月 25 日
編集済み: DoSeok Lee 2015 年 6 月 26 日
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);

採用された回答

B.k Sumedha
B.k Sumedha 2015 年 6 月 25 日
clc
close all
%host
rgbimage=imread('host.jpg');
figure;imshow(rgbimage);title('original color image');
[h_LL,h_LH,h_HL,h_HH]=dwt2(rgbimage,'haar');
dec2d = [...
h_LL, h_LH; ...
h_HL, h_HH ...
];
figure,imshow(uint8(dec2d));title('DWT2 of original color image');
%watermark
rgbimage=imread('watermark.jpg');
figure;imshow(rgbimage);title('Watermark image');
[w_LL,w_LH,w_HL,w_HH]=dwt2(rgbimage,'haar');
dec2d = [...
w_LL, w_LH; ...
w_HL, w_HH ...
];
figure,imshow(uint8(dec2d));title('DWT2 of Watermark image');
%watermarked
rgbimage=imread('watermarked.jpg');
figure;imshow(rgbimage);title('Watermarked image');
[wm_LL,wm_LH,wm_HL,wm_HH]=dwt2(rgbimage,'haar');
dec2d = [...
wm_LL, wm_LH; ...
wm_HL, wm_HH ...
];
figure,imshow(uint8(dec2d));title('DWT2 of Watermarked image');
%watermarking
newwatermark_LL= (wm_LL-h_LL)/0.30;
%extracted watermark image
rgb2=idwt2(newwatermark_LL,w_LH,w_HL,w_HH,'haar');
figure;imshow(uint8(rgb2));title('Extracted watermark');
imwrite(uint8(rgb2),'EWatermark.jpg');
  1 件のコメント
DoSeok Lee
DoSeok Lee 2015 年 6 月 26 日
編集済み: DoSeok Lee 2015 年 6 月 26 日
Hi~ B.k Sumedha thank you for my Question But I wonder your matlab source~
%host rgbimage=imread('host.jpg');%<-- example cameraman.tif (my file name)256x256
%watermark rgbimage=imread('watermark.jpg'); %<-- exmaple rice.tif (my file name)256x256
%watermarked rgbimage=imread('watermarked.jpg'); <-- I don't know what image insert?

サインインしてコメントする。

その他の回答 (0 件)

カテゴリ

Help Center および File ExchangeDiscrete Multiresolution Analysis についてさらに検索

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by