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Re: Alternative to threshold

Posted by Olivier Burri on Dec 08, 2011; 8:55am
URL: http://imagej.273.s1.nabble.com/Alternative-to-threshold-tp3682337p3682344.html

kirill8910 wrote
I tried to find edges but wooden annual rings on the background are distinguished as edges as well.
Hello,

You should try the following procedure:
Try applying a median filter to remove your cracks (They are smaller than the annual rings so the filter will remove them). Then you can subtract this image from your original and it will make your cracks stand out.

Have a look at the results.
Median filter subtraction on wood cracks image

Best

Oli