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Asked: 2026-06-05T18:09:49+00:00

I have a binary image that represents a number in MATLAB: I’d like to

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I have a binary image that represents a number in MATLAB:

image description

I’d like to fill all the digits. The desired result is:

enter image description here

The only thing I found was the imfill function, but that wasn’t really helpfull since I’ve lost my inner data (the 9’s inner circle for example).

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1 Answer

  1. Editorial Team

    The problem is how to distinguish the holes from the digits. A possible ad hoc solution is filtering them by the area of the pixels inside.

    function SolveSoProblem()

    I = imread('https://i.stack.imgur.com/SUvif.png');

    %Fill all the holes 
    F = imfill(I,'holes');

    %Find all the small ones,and mark their edges in the image
    bw = bwlabel(I);
    rp = regionprops(bw,'FilledArea','PixelIdxList');
    indexesOfHoles = [rp.FilledArea]<150;   
    pixelsNotToFill = vertcat(rp(indexesOfHoles).PixelIdxList); 
    F(pixelsNotToFill) = 0;
    figure;imshow(F);

    %Remove the inner area
    bw1 = bwlabel(F,4);
    rp = regionprops(bw1,'FilledArea','PixelIdxList');
    indexesOfHoles1 = [rp.FilledArea]<150;
    pixelListToRemove = vertcat(rp(indexesOfHoles1).PixelIdxList);
    F(pixelListToRemove) = 0;

    figure;imshow(F);
end

    After step(1):

    enter image description here

    After step(2):

    enter image description here

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