Image Watermarking Using DCT

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Mesita Widia Cahyaning
Mesita Widia Cahyaning il 15 Set 2019
Commentato: Walter Roberson il 25 Mar 2021
Hello im new to mathlab and doing image watermarking using dct method, but im facing this problem can anyone help me:( im a very beginner:(
clc;
clear all
I=imread('Sunset.jpg'); I=imresize(I,[300 300]);
if size(I,3)==3
I=rgb2gray(I);
end
figure,imshow(I), title('CITRA Penampung')
W=imread('copyright1.png'); I=imresize(W,[300 300]);
if size(W,3)==3
W=rgb2gray(W);
end
figure,imshow(W), title('CITRA Watermark')
alpha = 0.02;
A = dct2(double(I));
B = dct2(double(W));
C = A + alpha*B;
Iw = round(real(idct2(C)));
IIw = uint8(Iw)
figure,imshow(IIw), title('CITRA Terwatermark')
I=imread('Sunset.jpg'); I=imresize(I,[300 300]);
if size(I,3)==3
I=rgb2gray(I);
end
A=dct2(double(I));
C1=dct2(double(Iw));
B1=(C1-A)./alpha;
W1=uint8(idct2(B1));
figure,imshow(W1), title('CITRA Watermark Hasil Ekstraksi')
%this is the error I get
Matrix dimensions must agree.
Error in dct (line 76)
b = W .* fft(y);
Error in dct2 (line 49)
b = dct(dct(arg1).').';
Error in dctcoba (line 17)
A = dct2(double(I));
  3 Commenti
Cua Domain
Cua Domain il 25 Mar 2021
did you solve this? please help me
Walter Roberson
Walter Roberson il 25 Mar 2021
Cua, if you are encountering this problem, please show us size() of what you pass to dct2

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