How could I Remove the border outside a number?

hi，everyone:

could you tell me the way to delete the border outside the number '5' ?

thank you!

Answer 1

[Image Analyst]

As long as the box is not touching the 5, you can label it and call bwlabel to get blobs 1-6 and 8. Blob #7 will be the box.

% Make sure it's binary
mask = yourImage > 128;
[labeledImage, numRegions] = bwlabel(mask);
% Extract blobs 1-6 and 8
maskWithoutBox = ismember(labeledImage, [1,2,3,4,5,6,8]);

If the box touches the 5, then you're going to have to do tricker things (morphology like imopen or imerode) to separate them.

[H LIU]

Thank You Sincerely!

With the help of you，this problem has been solved.

BW = imread('*.png');
se = strel('disk',2);
BW1 = imopen(BW,se);
figure;
imshow(BW1,[]);