Posted by
Albert Cardona on
May 16, 2008; 2:25pm
URL: http://imagej.273.s1.nabble.com/isolating-lichens-from-the-background-tp3696183p3696185.html
> I'm new to image processing and ImageJ, so please bear with me. I need to
> be able to measure the area of healthy and necrotic lichens in
> photographs. Examples are at
http://dlia.org/images/Parker/ParkerTIFS.html >
> So far, I have not been able to isolate the lichen from the background,
> let alone measure anything. I would appreciate any suggestions anyone may
> have on a suitable approach.
An idea: perform texture analysis. The lichens look fairly homogeneous
texture-wise.
A very crude texture analysis: for a given circular ROI, determine by
whatever statistics (color, particle count, distance between local
maxima, ..., or a combination of them) whether it belongs to the lichen
or not. Then iterate the ROI over entire image, centered on each pixel,
so that you an create a mask: white for lichen pixels, black for
non-lichen pixels.
I am sure the literature has better ways to do it. This looks like the
kind of problem a neural network should be able to get trained for.
Hope that helps.
Albert
--
Albert Cardona
http://www.mcdb.ucla.edu/Research/Hartenstein/acardona