Length of a thin curved object in an image

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Audrey - 2022-02-19T10:17:11+00:00
Question: Length of a thin curved object in an image

I'd like to use image analysis to calculate the length of a thread.   Because the thread is not entirely straight, I can't just use regionprops, so I think the best option is to use the function bwdistgeodesic   In the bwdistgeodesic function, what is it expecting for the variable "mask"? How could I use image analysis to generate said mask? I've looked into using regionprops 'Extrema' property, but since I'm not sure what the "mask" variable is in bwdistgeodesic, I'm not sure how I would use the x,y dimensions from 'Extrema' in a mask.

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    • Expert Answer

    Profile picture of Kshitij Singh Kshitij Singh answered . 2025-11-20

    Because the thread is not entirely straight, I can't just use regionprops,
     
    Why not? Couldn't you just do
       S=regionprops(  bwareafilt(BW,1,'smallest') ,'Perimeter');

    length=S.Perimeter/2

     


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