Get ROI statistics in Javascript?

Posted by lechristophe on Jun 14, 2017; 9:24am
URL: http://imagej.273.s1.nabble.com/Get-ROI-statistics-in-Javascript-tp5018887.html

Dear ImageJers,

I'm trying to write a javascript snippet that retrieves a ROI from the ROI
manager, and returns the mean intensity but I can't seem to find out how to
do it.

Here am I so far:

- open a sample image
- draw a ROi on it, store it in the ROI manager
- run this script:

importClass(Packages.ij.IJ);
importClass(Packages.ij.plugin.frame.RoiManager);
importClass(Packages.ij.gui.Roi);

var imp = IJ.getImage();
var rm = RoiManager.getInstance();

var roi = rm.getRoi(0);
roi.setImage(imp);
var stat = roi.getStatistics();
IJ.log(stat.mean);

the "mean" property of the ImageStatistic returned by getStatistics() has a
value of NaN. How come? How to access the roi statistics in a purely
programmatic manner (ie without displaying stuff)?

Thanks for your help,

Christophe

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