How to delete one of the two outlines of an image

Question

Jórdan Venâncio Leite 2020-4-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515607-how-to-delete-one-of-the-two-outlines-of-an-image

评论： Rena Berman 2020-10-12

I have a binary image with two outlines (attachment). One larger and one smaller. I used the bwconncomp and regionprops function to identify such outlines and their respective areas. I would like to get another image, similar to the image i attached, but without the smaller outline. The regionprops function returns a struct with a field and two values where it is possible to identify the area of the smallest contour in which I want to remove it from my initial image. Do you have any idea how to solve this?

Thanks in advance

Contour = bwconncomp(image, 8);
area = regionprops(Contour, 'Area');

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Rena Berman 2020-10-12

(Answers Dev) Restored edit

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Answer 1

Ameer Hamza 2020-4-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515607-how-to-delete-one-of-the-two-outlines-of-an-image#answer_424211

Following code will select the smallest region and remove it from the image

load('Image.mat');
image = preenc;
Contour = bwconncomp(image, 8);
area = regionprops(Contour, 'Area');
[~, idx] = min([area.Area]);
mask = Contour.PixelIdxList{idx};
image(mask) = 0;
imshow(image);

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Ameer Hamza 2020-4-5

preenc is the name of the variable in your Image.mat file. Just set it to whatever is the name of your image variable.

Ameer Hamza 2020-4-5

Like this

load('Image.mat');
image = preenc;
Contour = bwconncomp(image, 8);
area = regionprops(Contour, 'Area');
idx = find([area.Area] < 50000);
for i=1:numel(idx)
    mask = Contour.PixelIdxList{idx(i)};
    image(mask) = 0;
    imshow(image);
end