Re: Roi Enlarge (without merging) / ROI merging / Edges to ROI conversion

Posted by Gabriel Landini on
URL: http://imagej.273.s1.nabble.com/Roi-Enlarge-without-merging-ROI-merging-Edges-to-ROI-conversion-tp3693456p3693459.html

On Wednesday 26 November 2008 17:51:02 Ghislain Bonamy wrote:
> Thanks for the prompt answer. I was thinking that reducing the particle
> size was easy enough via a mask transform and an erosion. It is possible
> that particles may become separated, but there isn't in my opinion a much
> better way to do it (unless one can directly resize an ROI).

Perhaps something like some iterations of thinning, would do it.

> For the seeded watershed, I look on the pugin page and found the two
> plugins you are reffering to, but they do not seem to be seeded watershed
> algorithm. Perhaps, I am missing something.

Like Michael said, you could provide a new image which has only your seeds and
apply the watershed to that.
Another possibility is to skeletonise the background (skiz, or influence
zones).

> I think your solution of redilate-no-merge is a great solution. Am I
> correct to believe that the plugin you are reffering to is the one you
> created in your morphology set?

Yes it is, but be aware that for particles that are separated by exactly 2
pixels thick space, one cannot dilate both objects. Since the algorithm
dilates all particles independently in a sequence, one will be dilated and the
other won't.

Cheers
G