Re: Tweaking the particle analyzer
Posted by
Michael Schmid on
Jul 15, 2013; 2:35pm
URL: http://imagej.273.s1.nabble.com/Tweaking-the-particle-analyzer-tp5003927p5003978.html
Hi Thomas,
here is a simple way to get the fraction of particle area in a region:
Start with a binary image (particles=255, everything else=0).
Use the Wand Tool to select the dark 'non-particle' at the top.
Then, Edit>Selection>Make Inverse to select your region of interest.
If you simply press Measure, the 'Mean' column will give you 255 times the area fraction of the particles in the region of interest. Thus, simply divide the 'Mean' value by 255. In your case, it's 0.47766/255 = 0.00187 or 0.187%.
Michael
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On Jul 11, 2013, at 21:38, Thomas Eschner wrote:
> ...apparently, the text disappeared automagically. Here it is:
>
>
> Dear all,
>
> I am struggling with a task, that first seamed quite easy to me, but now I run out of ideas...
>
> I want to determine the percentage of dark particles with respect to the white area (including the area of contained dark particles) - see attached image - and to add a single line entry to the summary window, very similar to what is done by the particle analyzer.
>
> "Remove on edge" successfully removes the upper large "particle", but the data still relates to the whole window.
>
> Is anybody aware of an approach that does the trick without going for programming? Any hint is welcome...
>
> Thanks in advance.
>
> Thomas
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