Matrix Dimensions Must Agree

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Mesita Widia Cahyaning 2019-9-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/480434-matrix-dimensions-must-agree

评论： per isakson 2019-9-16

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;