Filtering cracks

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Filtering cracks

jensglud
Hi ImageJ users

I am new to imagefiltering/procesessing and I have a question where I hope you have some good suggestions.

I am monitoring cracks developing in a material. I want to quantify the length of the cracks and number of cracks. In the album below you can see how the images of the cracks look like.

http://imgur.com/a/LeXXA#0

There is 3 pictures, one picture of the material without cracks, one with cracks and one where I have made a simple image subtraction. Do you have any ideas how to filter the image so the cracks will appear more clear for manual counting or maybe so I can use edge detection?

Best Regards
Jens