single pixel layer erosion

Posted by Paul Stutzman-2 on Sep 13, 2010; 1:19pm
URL: http://imagej.273.s1.nabble.com/single-pixel-layer-erosion-tp3686954.html

I am processing images of sectioned multi-phase particles in epoxy by  
SEM/BE/EDS into indexed 8-bit color images where each phase is  
uniquely identified (against a black background).  I have some edge  
effects due to the transition from the grain edge to epoxy that  
results  in a significant number of perimeter pixels being  
misidentified.  Median filters are only moderately successful in  
reducing these transition pixels.  I am looking for a means to erode  
a single layer of pixels around the outside perimeter of particles  
adjacent to the epoxy matrix (black) on the segmented image to remove  
these errant pixels.  Existing erosion plugins operate only on binary  
images, or produce a very coarse result.  The closest I have tried is  
the Greyscale dilate plugin from the morphological operators plugins  
of G. Landini (the erosion operation actually dilates bright  
particles on a black matrix) but it also operates on the pixels  
within the particles, altering the texture of the phase distribution.

Any thoughts or recommendations on plugins or modification of some  
existing plugin to be able to erode a layer of pixels adjacent to the  
greylevel=0 epoxy?
Apologies for any message duplication.

Thank you,

Paul Stutzman