how to built mean filter without padding ?

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Muhammad 2021-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/1438239-how-to-built-mean-filter-without-padding

评论： DGM 2021-8-22

i want this mean filter without padding and padding by replication .here in my code i have done padding with 1

a = input('Please input the matrix like "[1, 2; 3, 4]":');
% mf= ones(3,3)
% meanA = mean(A(:))
a1= padarray(a,[1 1],1)
[m n]=size(a1);
c=zeros(size(a));
for i=2:(m-1)
    for j =2:(n-1)
        v=a1(i-1:i+1,j-1:j+1)
        vrow= v(:)'
        r= median(v(:));
        c(i-1,j-1)=ceil(r)
    end
end

what modification do i need for this?

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DGM 2021-8-22

If you want to pad by replication, use the 'replicate' flag with padarray(). If you want to do the filtering without padding, you'll need to adjust your indexing limits accordingly, and you'll need to truncate your filter window as you operate near the image edges. Obviously, that sort of complication is why it's simpler to just use padding.

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