MATLAB: How to apply the arithmetic mean filter to a medical image to improve it? I have wrote this code but it did not work, there is an error which I could not figure it out.

Question

%arithmatic mean filter
im=imread('chest.tif');%loading image
figure,imshow(im);
title('original');
[row col]=size(im);%storing size of image
for i=1:1:row-2;%sweeping through rows
    for j=1:1:col-2;%sweeping through columns
        for u=1:1:2;%sweeping through window
            for v=1:1:2;
                %taking arithmetic mean
                im(i,j)=im(i,j)+im(i+u,j+v);
                im(i,j)=im(i,j)/9;
            end
        end       
    end
end
%showing final image
figure,imshow(im);
title('arthmean');

Answer 1

Avoid multiple for loops, use inbuilt imfilter function for masking operation.

The concept is same in all images. For image enhancement you can perform numerous operation depends on input image.

%arithmetic mean filter
im=rgb2gray(imread('chest.tif'));
h=fspecial('average',3);
filter_image=imfilter(im,h);