To find tortuosity of blood vessels (curve fitting toolbox)

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Meena 2012-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/26818-to-find-tortuosity-of-blood-vessels-curve-fitting-toolbox

hi....I have to find tortuosity of blood vessels.I have segmented vessels and it is in image..I have to find tortuosity using differentiation technique..for that I have to convert the curve in 2D to One dimensional .if u have any idea help me.now i am thinking to use curvefit toolbox..is it possible to find using that?if so pls help me how to do..?

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Walter Roberson 2012-1-23

Duplicate is at http://www.mathworks.com/matlabcentral/answers/25561-how-to-find-tortuosity-of-blood-vessels-in-fundus-images-using-matlab-now-how-to-get-1d-curve-from

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Answer 1

Walter Roberson 2012-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/26818-to-find-tortuosity-of-blood-vessels-curve-fitting-toolbox#answer_34920

We
Need
Images
To
Work
From.

Still.

We asked you this before. Twice.

You are unlikely to get any assistance until you show us images.

But not here: this question should be merged in with your other questions on the same topic.

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Answer 2

Meena 2012-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/26818-to-find-tortuosity-of-blood-vessels-curve-fitting-toolbox#answer_34932

https://docs.google.com/open?id=0B6vfhoeHY-c2M2M3YjczODMtNzkxZC00NzgzLTg3YmQtMGNkNTU4YTQzM2Y4

here is the fundus image...or see in this link http://img265.imageshack.us/img265/2830/tort1.png

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Image Analyst 2012-1-23

Walter said not to put this here. So which of the three threads on this topic do you want to be the "master" one?

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Answer 3

Meena 2012-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/26818-to-find-tortuosity-of-blood-vessels-curve-fitting-toolbox#answer_37631

I have deleted other threads ...

I have extracted blood vessels from fundus image.I have to find the coordinates of the subvessel.I have done using find function but not correct for all subvessels.So I have to trace the coordinates from start end point to last end point.I am thinking to try using 8 connected component concept.Is there any other method possible..give your idea... I have to get function y=f(x) for the curve.I have tried using curve fitting but not getting exactly..Help me if u have any idea in this.... here is the sub vessel image

http://img546.imageshack.us/img546/1413/subvessel.png

after finding the function i have to use formula the curvature is K = f'' / (1 + f'^2)^(3/2) pls help me out