how can i measure the longest point of my lightning image?
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Image Analyst
2019-4-8
One way to find the longest spine might be to compute the skeleton and endpoints with bwmorph(). Then compute distance between all identified endpoints with bwdistgeodesic(). See Steve's Image Processing blog
Then find out which pair of endpoints had the longest distance.
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darova
2019-4-8
Draw black (0,0,0) line you want to calculate the length
![longest.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/212699/longest.png)
See attached script
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Image Analyst
2019-4-9
If you're going to draw a black line with paint, then you might as well use imfreehand() in MATLAB. I think he was looking for an automatic way, like me (below) or Matt J (above in comments section) suggested. That said, sometimes it's more time effective to employ user-assisted image analysis than trying months or years to get an automatic method (luckily this application won't take anywhere near that long).
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