Re: FW: Cracks

Posted by Gabriel Landini on Sep 02, 2014; 8:16am
URL: http://imagej.273.s1.nabble.com/Cracks-tp5009456p5009458.html

On Tuesday 02 Sep 2014 07:57:52 Ivan Jerman wrote:
> I need to calculate the lenght of the cracks on image like enclosed. My
> question is if it is possible with ImageJ. I would be very pleased if there
> is some plugin for this task.

I think cracks are typically fractal, so "length" will depend on the
resolution of the image. The closer you look, the longer they become.
If you were able to segment the cracks (the image posted is not clear), I
think that length would not be very useful unless the cracks were pretty much
linear.
Perhaps measuring the fractal dimension of the cracks would tell you something
about their geometry. So you could binarise the cracks, then apply the box
counting command "Analyze>Tools>Fractal box count" to do that.
Cheers

Gabriel

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