Matrix Dimensions Must Agree
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Hello I'm new to mathlab and I'm facing this issue. I'm gonna making image watermarking using dct method and this is my code, hope i can find the solution of this, thankyou beforeee
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(I,[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 dctcoba (line 19)
C = A + alpha*B;
0 Comments
Answers (1)
per isakson
on 15 Sep 2019
Edited: per isakson
on 15 Sep 2019
Is this a copy&paste error?
W=imread('copyright1.png'); I=imresize(I,[300 300]);
Replacing the line by
W=imread('copyright1.png'); W=imresize(W,[300 300]);
might help.
7 Comments
per isakson
on 16 Sep 2019
The line number and the code of the error message doesn't agree with the code of your question. We are thus running diffent codes.
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