code for different attacks on watermarking

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Sunita Pradhan 2022-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/1703350-code-for-different-attacks-on-watermarking

评论： Walter Roberson 2022-4-26

please help for different types of attacks for watermarking

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回答（1 个）

Image Analyst 2022-4-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1703350-code-for-different-attacks-on-watermarking#answer_949230

See section 24.3 here:

http://www.visionbib.com/bibliography/contentschar.html#OCR,%20Document%20Analysis%20and%20Character%20Recognition%20Systems

You'll find lots of papers on it.

(Anticipating your next question.....)

Sorry, I don't have any of them coded up for you.

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Sunita Pradhan 2022-4-24

在 MATLAB Online 中打开

can you please check the file error...and help me to solve the issue.

clc
close all
%Original Image
host=imread('128.jpg');
subplot(1,3,1)
figure(1);
imshow(host);
title('Original color image');
[h_LL,h_LH,h_HL,h_HH]=dwt2(host,'haar');
img=h_LL;
%watermark Image
watermark=imread('32.jpg');
watermark=imresize(watermark,[m n])
subplot(1,3,2)
figure(2);
imshow(watermark);
title('Watermark image');
[w_LL,w_LH,w_HL,w_HH]=dwt2(watermark,'haar');
img_wat=w_LL;
% watermark embedding
wd_LL=h_LL+(0.03*w_LL);
%output
watermarked=idwt2(wd_LL,h_LH,h_HL,h_HH,'haar');
imwrite(uint8(watermarked),'Watermarked.jpg');
subplot(1,3,1)
imwrite(res,'DwtwatermarkedImage.jpg','jpg');
figure(3);
res=((uint8(watermarked)));
imshow(res);
title('Watermarked Image');
inputImage=res;
wm=imread(res);
[wm_LL,wm_LH,wm_HL,wm_HH]=dwt2(wm,'haar');
%watermark extraction
ewat=(wm_LL-h_LL)/0.03;
%output
watermarked=idwt2(ewat,w_LH,w_HL,w_HH,'haar');
figure(4);imshow(uint8(watermarked));
op=((uint8(watermarked)));
imwrite(uint8(watermarked),'EWatermark.jpg');title('Extracted Watermark');
mse_extraction=MSE(res,op)
psnr=PSNR(res,op)