Embed watermark in background of an document image

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Balkar Singh
Balkar Singh 2020-1-25
评论： Balkar Singh 2021-3-7
I need code to embed and extract watermark in background of a document image.
  13 个评论
显示 11更早的评论
Walter Roberson
Walter Roberson 2021-2-22
Which algorithm did you decide upon? What error did you encounter in your MATLAB implementation of the algorithm?
Balkar Singh
Balkar Singh 2021-3-7
clear all;
a1=imread('Marksheet1.png');
a2=imresize(a1, [256 256]);
a = a2(1:256,1:256,1);
blk1 = our_blkproc(a,blksize1);
cover_img = zeros(8,8,size(blk1,3));
for i=1:size(blk1,3)
cover_img(:,:,i) = dct2(blk1(:,:,i));
end
% cover_img1 = cover_img/2;
b1 = imread('logo.png');
b2 = imresize(b1, [128 128]);
blksize2=[8,8];
b = b2(1:128,1:128,1);
blk2 = our_blkproc(b,blksize2);
water_img = zeros(8,8,size(blk2,3));
for i=1:size(blk2,3)
water_img(:,:,i) = dct2(blk2(:,:,i));
end
%water_img = water_img/2;
%final_value = zeros(8,8,size(blk1,3));
final_value = cover_img;
cnt1=0;
for i = 1:size(water_img,3)
final_value(1,1,i) = water_img(1,1,i);
cnt1=cnt1+1;
end
dct_inv = zeros(8,8,size(final_value,3));
cnt2=0;
for i=1:size(final_value,3)
dct_inv(:,:,i) = idct2(final_value(:,:,i));
cnt2=cnt2+1;
end
output = our_blkproc_rev(dct_inv);
imshow(uint8(output))
Sir, I tried this code

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