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..?

[Walter Roberson]

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

Answer 1

[Walter Roberson]

• 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.

Answer 2

[Meena]

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

[Image Analyst]

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

Answer 3

[Meena]

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