how to make mean filter ?

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Muhammad 2021-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/1437979-how-to-make-mean-filter

编辑： Walter Roberson 2021-8-21

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i want to make a mean filter of 3x3 and it takes any row column matrixes and perform mean filter

in my task i can not use bultin filter in matlab i have a code in octave

a = input('Please input the matrix like "[1, 2; 3, 4]":');
a1= paddones(a)
[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= sum(v(:))/9 ;
        c(i-1,j-1)=ceil(r) ;
        
    end
end

when i am running this code in matlab ,its giving error in line no 2

a1=paddones(a)

and in line no 9

r= sum(v(:))/9 ;

tell me what changes i needed to remove error?

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Muhammad 2021-8-21

i want to make the mean and median filter that takes matrix input from the user and perform fuction

sir tell me what modification do i need in this code

Walter Roberson 2021-8-21

编辑：Walter Roberson 2021-8-21

mean filter can be done with conv(). median filter can be done with nlfilter()

Or you could use blockproc() https://www.mathworks.com/help/images/ref/blockproc.html

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