Length Measurement on Pictures

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Steffen 2012-6-7

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Hi,

i have images with fibres on them and I need a simple way to measure the length of those fibres.

My idea is, that I can add a starting point and several points in between the starting point and a endpoint, maybe just by left mouse click, and finish the process by right click. Since not all the fibres at straight but also curved, I need more than a starting and end point.

What would be the easiest way to write a program for that? Using GUI? Any ideas ? :)

Thanks for your help

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Ryan 2012-6-8

I'll play with it in my free time at work tomorrow, see if I can figure something out quickly to segment it.

Steffen 2012-6-8

well good luck, i have tested the code of a guy who wrote a whole master thesis about this problem.

but if you find a way, it would be great ;)

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Image Analyst 2012-6-8

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That looks tough. I can foresee A LOT of false positives and false negatives. You might have to combine a multitude of approaches, like thresholding, edge detection, Hough() or Houghlines(), morphological filters, etc. Or do some research on ridge and valley detection: http://en.wikipedia.org/wiki/Ridge_detection

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Image Analyst 2012-6-8

Ryan, I don't believe Canny uses ridge detection: http://en.wikipedia.org/wiki/Canny_edge_detector

Ryan 2012-6-8

I was under the impression that the nonmaximal supression step in Canny edge detection was needed as a result of the ridges that result in the gradient calculation.

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