How to coded this filter in Matlab

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Rooter Boy
Rooter Boy 2020-11-3
评论： Rooter Boy 2020-11-19
clc
clear all
img=double(imread('cameraman.tif'));
imshow(uint8(img))
[m n]=size(img);
w = ones(3)
for i=0:m-3
for j=0:n-3
sum=0;
for k=1:3
for l=1:3
sum = sum + img(i+k,j+l)*w(k,l);
end
end
img1(i+1,j+1) = sum/9;
end
end
img2 = uint8(img1);
figure
imshow(img2)
%imwrite(img2,‘output.png','png');
I coded for 1/9*(ones(1) but i can't write for 1/16*[1,2,1;2,4,2;1,2,1] in Matlab. I don't know how to do this. I need same coded for 1/16*[1,2,1;2,4,2;1,2,1]. and if we take i and j = 0, how should the code be? Would you help me please?

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-11-3
Write the code like this
clc
clear all
img=double(imread('cameraman.tif'));
imshow(uint8(img))
[m n]=size(img);
w = 1/9*ones(3); % <---- ones(3) is divided by 9
for i=0:m-3
for j=0:n-3
sum=0;
for k=1:3
for l=1:3
sum = sum + img(i+k,j+l)*w(k,l);
end
end
img1(i+1,j+1) = sum; % <---- division by 9 is removed.
end
end
img2 = uint8(img1);
figure
imshow(img2)
Then you can simply replace 'w' with
w = 1/16*[1,2,1;2,4,2;1,2,1];
and it will display correct image.
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Rooter Boy
Rooter Boy 2020-11-19
Sir, could you help me when you are available?
https://www.mathworks.com/matlabcentral/answers/652808-nwc-and-lcm-code-block-in-matlab

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