How to get the centerline of a binary region

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Sam Ade 2021-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/1565406-how-to-get-the-centerline-of-a-binary-region

评论： Woj 2023-1-11

I have a binarize image below, I am trying to find the centerline of the image such as that in red on the binarize image. I did use the bskel function but get branches. I am hoping to elimated (prone or remove) all branches.

Any suggestions will be most appreciated. Any other way to do this another than using bskel will be great too.

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采纳的回答

DGM 2021-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/1565406-how-to-get-the-centerline-of-a-binary-region#answer_810161

在 MATLAB Online 中打开

arc.png

There's this.

A = imread('arc.png')>128;

B = bwmorph(A,'skel',inf); % skeletonize

B = imfill(B,'holes'); % get rid of any tiny closed paths

B = bwmorph(B,'skel',inf); % finish skeletonizing

% remove endpoints until only two are left

while true

e = bwmorph(B,'endpoints');

if nnz(e)>2

B = B & ~e;

else

break;

end

imshow(B)

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更多回答（1 个）

KSSV 2021-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/1565406-how-to-get-the-centerline-of-a-binary-region#answer_810141

在 MATLAB Online 中打开

You can get the indices of white pixels using find and to the data you can try fitting a line or quadratic equation using polyfit.

[y,x] = find(I) ;
p = polyfit(x,y,2) ;
xi = linspace(min(x),max(x)) ;
yi = polyval(p,xi) ;
plot(X,y,'.k')
hold on
plot(xi,yi,'r')

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Matheus Ferreira 2022-6-8

Great, thank you! Worked perfect!

Woj 2023-1-11

Hi. Sry for the stupid question, but im very very new to matlab. I have exactly the same problem, but i dont understand how do i find the white pixels?

thank you

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