MATLAB: Max filter for 5 x 5 and 9 x 9 pixel size

image processing

%READ AN IMAGE
A = imread('sample2.jpg');
A = rgb2gray(A(1:300,1:300,:));
figure,imshow(A),title('ORIGINAL IMAGE');
%PREALLOCATE THE OUTPUT MATRIX
B=zeros(size(A));
%PAD THE MATRIX A WITH ZEROS
modifyA=padarray(A,[1 1]);
      x=[1:3]';
      y=[1:3]';
      for i= 1:size(modifyA,1)-2
          for j=1:size(modifyA,2)-2
              %VECTORIZED METHOD
              window=reshape(modifyA(i+x-1,j+y-1),[],1);
               %FIND THE MAXIMUM VALUE IN THE SELECTED WINDOW
              B(i,j)=max(window);
          end
      end
%CONVERT THE OUTPUT MATRIX TO 0-255 RANGE IMAGE TYPE
B=uint8(B);
figure,imshow(B),title('IMAGE AFTER MAX FILTERING');
I want to do a 5×5 and 9×9 size pixel fro this coding. Can someone help me ?
Thank you

Best Answer

For the N x N, use
x = (1:N).';
y = x;
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