How to find the endpoint?

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ZWY
ZWY on 8 Jun 2022
Commented: ZWY on 10 Jun 2022
Hi, i have an image and wanted to find the location of endpoints as shown in red circle.
I am using the
bw=bwmorph(bw,'endpoints')
however, it returns "0" instead of the location of endpoints.
How can I do with this? Thank you.
  2 Comments
ZWY
ZWY on 10 Jun 2022
Thanks Rik.

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Accepted Answer

DGM
DGM on 8 Jun 2022
Edited: DGM on 8 Jun 2022
% image recovered from screenshot
A = imread('vessel.png');
A = A>128; % binarize
% skeletonize
B = bwskel(A,'minbranchlength',50);
% fill loops
B = imfill(B,'holes');
% skeletonize to get rid of filled loops
B = bwskel(B,'minbranchlength',50);
imshow(B) % display interpolation makes fine lines look spotty
% get endpoints as a logical image
endpts = bwmorph(B,'endpoints');
imshow(endpts) % again, display interpolation hides most of the dots
That result can be used for logical indexing if needed. If for some reason, you can't use it directly and need indices instead, you can use find().
% if you really truly need indices instead
endptidx = find(endpts)
endptidx = 21×1
807 124117 134946 246304 371291 453988 479473 492705 497657 526278
  6 Comments
ZWY
ZWY on 10 Jun 2022
I got it. Thanks all for helping, really appreciate it!

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