Hi Paul,
a surface blur (thresholded blur) filter applied several times can
sharpen edges.
You can try
http://imagejdocu.tudor.lu/doku.php?
id=plugin:filter:thresholded_blur:start
(the link should be one line)
with 'Strength' between 3 and 5 and the threshold smaller than the
difference between the phases, but larger than half that difference.
Another option would be creating a binary mask, apply binary erode or
dilate, convert it to a selection and (Edit>Selection>Create
Selection) and then do some operation such as 'Clear',
Process>Math>Set, 'Minimum' or 'Maximum' filters, etc, on that
selection.
Michael
________________________________________________________________
On 13 Sep 2010, at 15:19, Paul Stutzman wrote:
> 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
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