How to clear objects connected to the lower borederof the image?

Question

Richa Nayak 2013-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/69068-how-to-clear-objects-connected-to-the-lower-borederof-the-image

评论： ammar roslan 2021-6-23

There are 10 objects in my picture of varying sizes. two of them are connected to (contain) the lower boreder of an 80x80 image. The image is binary. I do not want to use bwareaopen.Plzzzzzzzz help. Thank You

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Answer 1

Steve Eddins 2013-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/69068-how-to-clear-objects-connected-to-the-lower-borederof-the-image#answer_80369

在 MATLAB Online 中打开

% Start by padding the image with 0s on the left, top, and right.
bw2 = padarray(bw,[1 0],0,'pre');
bw3 = padarray(bw2,[0 1],0,'both');
% Remove objects touching the border of the padded image.
bw4 = imclearborder(bw3);
% Remove the padded columns and padded row.
bw5 = bw4(2:end,2:end-1);

See my 18-Dec-2012 blog post.

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Steve Eddins 2013-3-29

Yes, it will remove only the objects connected to the lower border. That's the reason for the first two lines (padding the image) and the last line (removing the padded columns and row). Follow the link to my blog post for more explanation about this technique.

ammar roslan 2021-6-23