how i can find these branching point

Hi all

Who i can find these four points?

Note: the extention of this image in matlab is logical

Answer 1

[Matt J]

[I,J] = find(binaryimg<max(binaryimg(:))/2);
IJ = [I,J];
[~,idx] = min(IJ*[1 1; -1 1; 1 -1; -1 -1].');
Corners = IJ(idx,:);

For some elaboration on why this works, see this thread,

https://www.mathworks.com/matlabcentral/answers/413079-i-am-trying-to-find-the-corners-of-the-rectangular-shapes-this-code-is-working-very-well-but-i-d

[mohammed alany]

But this code gave me the cornner of the image?? i would calcuylate the vertix

[mohammed alany]

Now, if i have this figure, how i can get the 7 branching points?

[Matt J]

That is a different question. Basically, though, I would use bwpropfilt to remove the black rectangle in the middle. Then I would use houghlines to find all sides of the remaining polygon and their end points.

[mohammed alany]

can you please write me a code to find these point?

[Matt J]

That wouldn't leave any fun for you ;)

[mohammed alany]

ok, can you give more help about what you say above? "Then I would use houghlines to find all sides of the remaining polygon and their end points"

because i dono't have engough information in matlab,

Thank you