Measure the rate of growth of a crack from Image frames

My experiment involves subjecting a substance to pressure that makes the substance eventually crack. The crack grows with time and pressure applied. I currently have a camera set up to take pictures at of the substance at fixed intervals.

I need to measure how fast the crack grows. How do I go about this?

Sample images can be found here - https://drive.google.com/open?id=189cv8B4rm3lhSgT6OYfI_aN0Xmqi-tYi

[KALYAN ACHARJYA]

May be research based high level question, hence I was unable to get it.

[Daniel M]

Hello, can you upload an image and draw where the crack is, and another image with a larger crack and indicate where that is too? How do you quantify crack growth, is it along a particular dimension, is it by volume or something else?

(I'm not qualified to answer this question, just wanted to extract some more information for others to make use of.)

Nevermind, just saw the google drive. It's clear where the cracks are, and also clear that you intend to measure growth along the length of the object.

[Hank]

Automating the detection of the end of the crack may be possible by cropping and binarizing the image, then detecting the left most point. It would get tricky though, especially when the device is periodically closed back up as I see in the images.

Since there aren't so many, it may be easier to loop through and use drawpoint() so the user can identify the end of the crack with the mouse. Then you can track the motion, in pixel lengths programmatically.

Its up to you to get the pix to mm scale and to figure your way around the shifting image position and focus.

I agree with Daniel and Kalyan, this sounds provincial to your research and there are some methodology problems to be answered first. Good luck.

[Aneeshaa Chowdhry]

Is it not possible to measure how fast the crack grows without having to identify tip of the crack?

I know speed of vehicles can be measured from video. I just wanted to find out if I can somehow measure the speed of the growth of the crack.