Interpretation of results using directionality plugin

Posted by anusuya pal on Oct 15, 2017; 8:52pm
URL: http://imagej.273.s1.nabble.com/Interpretation-of-results-using-directionality-plugin-tp5019532.html

Hello,

I have a trouble in interpreting the results which I have using
directionality plugin. For the convenience, I am attaching the image, in
which I want to find all possible information related to the cracks.
Firstly I want to find the orientation of the cracks, and that's why I have
used directionality plugin to the gray-scaled image. Is this the correct
way to use this plugin, or I need to change the image so that it only has
cracks (The variance filter is used on the gray-scaled image, and attached
as modified.jpg)? I went through the details given on
http://imagej.net/Directionality

The results using local gradient orientation on the gray-scaled image are-
direction -90.77
dispersion  1.03
amount 0.07
goodness 0.95

As my advisor doesn't have much idea about ImageJ, it's very hard for me to
do the interpretation of the above results. Whatever I understood is the
following.

As the result gives the flat histogram mostly, there is no preferred
direction of the structures except the one at around -90 and 90 degrees
though I don't understand what does that peak means.

The Center of the Gaussian is given by -90.77 with the standard deviation
of 1.03. (The fit is good as the goodness is close to 1). The proportion of
the structure orienting at around -90 is 7%. As the amount value is 0.07,
it implies about the uniformity of the structures.

May I request to go through the results?

Thanks
Anu

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