how to add a matrix with the pixel of an image

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sadiqa ilyas 2019-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/479280-how-to-add-a-matrix-with-the-pixel-of-an-image

评论： Walter Roberson 2019-9-7

Hi I want to add a matrix with the pixels of an image.image size is 512 512 and matrix size is 2*2.

I=imread('lina512.bmp');
key=[8 5;5 3];
k=de2bi(key);
red=I(:,:,1);
I1=de2bi(red(:));

I dont know how to do bitwise xor

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sadiqa ilyas 2019-9-7

在 MATLAB Online 中打开

k(binary )of key matrix is xored with the binary of the pixels.

I=imread('lina512.bmp');
key=[8 5;5 3];
k=de2bi(key);
red=I(:,:,1);
I1=de2bi(red(:));
[x y]=size(I1);
zor=zeros(size(I1));
for i=1:x
            zor(i,:)=xor(I1(i),k)% gives error.
end
zor;
Can u plz tell what is the mistake

Walter Roberson 2019-9-7

Your image is probably 8 bit so your I1 is probably something by 8. Your key values are at most 8 so only need 4 bits and there are 4 of them so k is 4x4. zor is the same size as I1 so it is something by 8. You have a for loop over the number of rows in I1 so I1(i) will be a scalar representing one bit (not a row of bits). Your xor that scalar with the 4x4 k so you get a 4x4 result. You try to store that 4x4 result in zor(i, :) which is 1x8.

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