MATLAB CODE FOR MORPHOLOGICAL OPERATIONS 1) EROSION 2) DILATION 3) OPENING 2) CLOSING
% EROSION FUNCTION
function ero=erosion(im) %% ero = return name % erosion == fun calling
%im=imread('text.png');
se=ones(3,3);
[p,q]=size(im);
imp=zeros(p+2,q+2);
imp(2:p+1,2:q+1)=im;
for i=2:p+1
for j=2:q+1
im1=zeros(3,3);
w=imp(i-1:i+1,j-1:j+1);
im1=se*w;
imp(i-1,j-1)= min(im1(:));
end
end
ero=imp(2:p+1,2:q+1);
end
% DILATION FUNCTION
function dil=dilation(im) %% dil = return name % dilation == fun calling
%im=imread('text.png');
se=ones(3,3);
[p,q]=size(im);
imd=zeros(p+2,q+2);
imd(2:p+1,2:q+1)=im;
for i=2:p+1
for j=2:q+1
im2=zeros(3,3);
w=imd(i-1:i+1,j-1:j+1);
im2=se*w;
imd(i-1,j-1)= max(im2(:));
end
end
dil=imd(2:p+1,2:q+1);
end
% MAIN CODE
%im=imread('text.png');
im=imread('blobs.png');
subplot 231
imshow(im);
title('ORIGINAL IMAGE');
% erosion
ero=erosion(im);
subplot 232
imshow(ero);
title('EROSION');
% dilation
dil=dilation(im);
subplot 233
imshow(dil);
title('DILATION');
% opening
dil2=dilation(ero);
subplot 234
imshow(dil2);
title('OPENING');
% closing
ero2=erosion(dil);
subplot 235
imshow(ero2);
title('CLOSING');