How can I outline the inside border of this ring? ie. highlight the inner circle

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Love Matlab 2020-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/542456-how-can-i-outline-the-inside-border-of-this-ring-ie-highlight-the-inner-circle

评论： Star Strider 2020-6-5

采纳的回答： Star Strider

I am trying to highlight the inner border of this ring in the image attached. Is this possible?

Thank you for your help

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Star Strider 2020-6-5

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https://ww2.mathworks.cn/matlabcentral/answers/542456-how-can-i-outline-the-inside-border-of-this-ring-ie-highlight-the-inner-circle#answer_446489

在 MATLAB Online 中打开

Try this:

I = imread('Love Matlab image.jpeg');
IBW = im2bw(I);
Bnd = bwboundaries(IBW);
figure
imshow(IBW)
hold on
plot(Bnd{4}(:,2), Bnd{4}(:,1), '-r', 'LineWidth',2)
hold off

producing:

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Love Matlab 2020-6-5

thank you!

Star Strider 2020-6-5

As always, my pleasure!

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