Posted by
Rasband, Wayne (NIH/NIMH) [E] on
Sep 25, 2016; 7:43pm
URL: http://imagej.273.s1.nabble.com/A-problem-with-area-measurements-tp5017237p5017238.html
> On Sep 25, 2016, at 12:39 PM, Avital Steinberg <
[hidden email]> wrote:
>
> Hi,
> I'm having trouble measuring areas of composite Rois in Javascript. When I
> run the following code, I get a strange answer for the area of the
> composite:
Hi Avital,
This bug is fixed in the latest ImageJ daily build (1.51h2). Here is a simpler version of your JavaScript that also reproduces the bug:
ip = new ByteProcessor(2000,2048);
roi1 = new Roi(324,366,231,120);
roi2 = new Roi(231,261,549,354);
shpRoi1 = new ShapeRoi(roi1);
shpRoi2 = new ShapeRoi(roi2);
ip.setRoi(shpRoi1);
IJ.log("The area for shpRo1 is: " + ip.getStatistics().area);
ip.setRoi(shpRoi2);
IJ.log("The area for shpRo2 is: " + ip.getStatistics().area);
shpRoi3 = shpRoi2.not(shpRoi1);
ip.setRoi(shpRoi3);
IJ.log("The area for shpRo3 is: " + ip.getStatistics().area);
-wayne
> importClass(Packages.ij.IJ);
> importClass(Packages.ij.plugin.frame.RoiManager);
> importClass(Packages.ij.ImagePlus);
> importClass(Packages.ij.process.ImageProcessor);
> importClass(Packages.ij.gui.Roi);
> importClass(Packages.ij.gui.ShapeRoi);
> importPackage(java.awt);
>
> rm = RoiManager.getInstance();
> if (rm==null) rm = new RoiManager();
> imp = IJ.createImage("Untitled", "8-bit ramp", 2000, 2048, 1);
> ip = imp.getProcessor();
> imp.setRoi(324,366,231,120);
> IJ.run("ROI Manager...", "");
> rm.addRoi(imp.getRoi());
> roi1 = imp.getRoi();
> imp.setRoi(231,261,549,354);
> rm.addRoi(imp.getRoi());
> roi2 = imp.getRoi();
>
> shpRoi1 = ShapeRoi(roi1);
> shpRoi2 = ShapeRoi(roi2);
> rm.addRoi(shpRoi1);
> rm.addRoi(shpRoi2);
>
> imp.show();
>
> ip.setRoi(shpRoi1);
> stats = ip.getStatistics();
> area = stats.area;
> IJ.log("The area for shpRo1 is: " + area);
>
> ip.setRoi(shpRoi2);
> stats = ip.getStatistics();
> area = stats.area;
> IJ.log("The area for shpRo2 is: " + area);
>
> shpRoi3 = shpRoi2.not(shpRoi1);
> rm.addRoi(shpRoi3);
> ip.setRoi(shpRoi3);
> stats = ip.getStatistics();
> area = stats.area;
> IJ.log("The area for shpRo3 is: " + area);
>
> Selecting the area and using Analyze, measure from the gui gives the
> results I would expect, but when I try to get the area from the
> ImageStatistics object, I get the wrong result.
>
> When you try to run the code, do you also get a strange result?
>
> Thanks,
> Avital
>
> --
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