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Following example show rank order filter effects on image , it show erosion and dilation effect . The value of the order is the key .
Code:

   
    
%% create a new figure to show the image 
    
imread('snowflakes.png');
    
figure(1);
    %% 
show the loaded image.
    
imshow(A);
    
    %% 
dilation affect.
    
ordfilt2(A,25,true(5));
    
figure(2),imshow(B)
    
    %% 
erosion affect.
    
ordfilt2(A,1,true(5));
    
figure(3),imshow(B)
 





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Author:
Mastermind
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