Measure the rate of growth of a crack from Video

asked 2019-11-08 10:51:20 -0500

AChow gravatar image

updated 2019-11-11 05:38:25 -0500

My experiment involves subjecting a substance to pressure that makes the substance eventually crack. The crack grows with time and pressure applied. I can have two set-ups:

  1. Take a picture of the substance at fixed intervals
  2. Record a video of the substance cracking

I need to measure or quantify the growth of this crack. How do I go about this? (I can code in Python). I'm unsure which setup would work better, but I'd like to be able to measure the growth with either.

Is there a way to measure live speed or speed of growth of crack from one frame to another?

Google drive link to series of pictures taken -

image description Kindly advise.

Thanks in advance.

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depends on what you want to measure ?

absolute growth ? (images will do)

relative growth / movement ? (time to read up on nyquist)

berak gravatar imageberak ( 2019-11-08 11:20:04 -0500 )edit

In case it is absolute growth, how do I go about it? how does OpenCV help me, assuming it can?

AChow gravatar imageAChow ( 2019-11-10 10:02:09 -0500 )edit

please put a (small) image HERE, not an external drive, thank you.

berak gravatar imageberak ( 2019-11-11 05:39:14 -0500 )edit

I have a series of images which are put on the drive. I've also inserted one image in the question. Is it not visible?

AChow gravatar imageAChow ( 2019-11-11 05:48:18 -0500 )edit

measuring the growth of a crack implies you're able to measure the size of it already.

are you able to do that ?

(if not so, it's far too early to be concerned about time, and you should have asked a different question.)

berak gravatar imageberak ( 2019-11-11 06:08:28 -0500 )edit

:) No, I have not measured anything yet. In case you have observed the series of images from the shared link, it can be seen that the crack grows along the length of the the metal plates. It is desired that I quantify or measure the rate of growth from one image frame to another.

Can OpenCV help with such a thing (crack detection and growth measurement ) ?

AChow gravatar imageAChow ( 2019-11-11 07:08:14 -0500 )edit