MATLAB: How can divide an image into blocks

digital image processingimageimage analysisimage processing

I want to divided image to 3*3 overlapping blocks, then I will make some operations on each block

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blockproc() with 'BorderSize' and 'TrimBorder' options, possibly followed by mat2cell()

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MATLAB: How to process each non-overlapped block of an image after it’s sub-division

cellfun() to process them. cell2mat() to recombine.

Have you considered using blockproc() instead of the steps you are taking now?

MATLAB: Manual median filter design

Well if you don't have the Image Processing Toolbox, I'm afraid you won't be able to use blockproc. In that case, you would have to resort to something like this:

imout = zeros(size(im),class(im));
for m = 3 : size(im,1)-2
    for n = 3 : size(im,2)-2
        list = im(m-2:m+2,n-2:n+2);
        imout(m,n) = median(list(:));
    end
end

Note that this is the most naive way to do it. There are lots of better ways to do it, but this is the easiest to understand.

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Related Solutions

MATLAB: How to process each non-overlapped block of an image after it’s sub-division

MATLAB: Manual median filter design

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