How to extract numerical data from a local thresholded image

I have an image that looks like this

https://preview.redd.it/wau23ultt7za1.png?width=946&format=png&auto=webp&v=enabled&s=313be2c33ca2e410025609b2cc7258c823afa8c7

I am trying to find the fiber (black lines) and find their diameter. The computer vision techniques I've used are generally binary segmentation, but I'm sure not sure how to obtain the diameter data after performing these processing techniques (I included some results from my attempts (local thresholding, and histogram based thresholding).

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https://preview.redd.it/zmio3vo0v7za1.png?width=640&format=png&auto=webp&v=enabled&s=dd364575fd0e247e5f79320247e0a54e8d20d566

https://preview.redd.it/itk0avo0v7za1.png?width=1229&format=png&auto=webp&v=enabled&s=5c1811981ed84a17c7598c23490f659959439515

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I am considering trying out region and edge based segmentation. I think the local thresholding …

binary computer computer vision computervision data extract image numerical processing segmentation vision