MIN FILTER IN MATLAB

/*CSEMATTER.BLOGSPOT.IN
PROGRAM FOR MIN FILTER IN MATLAB*/

A = imread('atul1.jpg');
A=imresize(A,[300,300]);
A = rgb2gray(A)
figure,imshow(A),title('ORIGINAL IMAGE');
B=zeros(size(A));
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
     
     
       window=reshape(modifyA(i+x-1,j+y-1),[],1);
               B(i,j)=min(window);

    end
end
B=uint8(B);
figure,imshow(B),title('IMAGE AFTER MIN FILTERING');