Dear all, I've attached the image in which is of fabric obtained through electron microscope. The problem is that I want to separate the thick fibers(marked blue in img2) from the thin fibers(marked red). thin fibrils are defects. How can i do that?

Original Image

Image1

Image2

Answer 1

[Image Analyst]

I don't think you can except by manually tracing them. For example, some of the fibrils are thin bright ridges, but a lot of the edges of the big fibers also look like thin bright ridges.

What do you need to know anyway? Can't you just trace the fibrils manually and add up the length of the traced lines?

[sonya yasr]

The first image shown above is of a fabric. Red color in second image shows defected fibril (It was not red. We have marked it red to show you defected fibrils). I have to make a code that can tell me if the number of defected fibrils are greater than a certain number.

[sonya yasr]

@ Image Analyst

Can you please provide me code to measure diameter of fibers?

Its similar one mentioned below.

http://www.mathworks.com/matlabcentral/answers/76528-measurement-in-images-image-analysis

[Image Analyst]

I've done all I can in the time I can provide to your project. SEM images are notoriously difficult. Yours could be a Master's project (and maybe it is yours) so it's not something I'm going to bang out in 5 minutes. Good luck.