how to calculate the diameter of a vessel

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hello everyone
I really need help as soon as possible
I want a solution to calculate the diameter of each white line in the image(Vessel Diameter Measurement)
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John D'Errico
John D'Errico 2014-4-17
Compute the radius. Multiply by 2.
Really, we are not here to do your homework as soon as possible. IF you could not start it in a timely way, then why should we rush?
Make an effort, as that is the way to learn. Or don't make an effort. In that case, learn to say the phrase "Do ya want fries with that order?"

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Sean de Wolski
Sean de Wolski 2014-4-17
You might find the second part of this webinar helpful:

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Image Analyst
Image Analyst 2014-4-17
编辑:Image Analyst 2020-5-7
It's pretty easy - maybe 3 lines of code. First call bwdist to get the distance from the white pixels to the nearest black pixel. Then call bwmorph to skeletonize that so you get the distances along the centerlines. That's the radius so multiply by two to get the diameter. It will be an image looking like a skeleton and to find the diameter you simply look at the value of the pixel at the location you want the diameter of. Basically it's this (untested):
edtImage = 2 * bwdist(~binaryImage);
skeletonImage = bwmorph(binaryImage, 'skel', inf);
diameterImage = edtImage .* double(skeletonImage);
Can't get much simpler, though you may want to add a utility where you let the user call ginput() to report back the diameter at the closest pixel to where they clicked. It's pretty easy, though clever and not obvious (until you know about it), so most novices might embark on some complicated looping process to get cross sections (what a nightmare that would be).
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Nitin
Nitin 2014-4-17
I would start by first experimenting with regionprops function in matlab

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