Removing multiple ROIs

Posted by Ohkyung on Jun 11, 2010; 9:15pm
URL: http://imagej.273.s1.nabble.com/Removing-multiple-ROIs-tp3687938.html

Dear ImageJ users,

I am trying to remove several ROIs from ROI manager in a macro. I know
there is a way to do so in plugin programming. However, I want to do
this in macro if it is not impossible.

1. No problem to delete one ROI from the manager.

roiManager("Select", index);
roiManager("Delete");.

2. However, when I try to delete several ROIs at the same time, it is
not working. I think that it is due to the fact that roi manager
automatically reassign new index starting from 0 when I delete one Roi
from roi manager. Thus, I cannot delete  several ROIs that I want to
delete.

                for (iRow = 0; iRow <nResults; iRow++) {
                        area = getResult("Area", iRow);
                        if (area >= 200) {
                                roiManager("Select", iRow);
                                roiManager("Delete");
                        }
                }

3. I also tried to select multiple ROIs first. Then delete them. But
this also did not work.

                for (iRow = 0; iRow <nResults; iRow++) {
                        area = getResult("Area", iRow);
                        if (area >= 200) {
                                roiManager("Select", iRow);
                        }
                }
                roiManager("Delete");


Any good ideas? Thanks very much in advance.

Best regards,
Ohkyung


P.S.
To select unwated ROIs, I want to use different parameters that are
not currently supported by ImageJ. I used "Area" just to demonstrate
what I want to do.