NucleusJ

Correct error in the NucleusSegmentation, which involved the early stop of the process.
Test realised on FIJI and imageJ:

java.lang.IndexOutOfBoundsException
at ij.ImageStack.getVoxel(ImageStack.java:373)
at gred.nucleus.core.NucleusSegmentation.isVoxelThresholded(NucleusSegmentation.java:218)
at gred.nucleus.core.NucleusSegmentation.applySegmentation(NucleusSegmentation.java:118)
at gred.nucleus.core.NucleusSegmentation.run(NucleusSegmentation.java:53)
at gred.nucleus.plugins.NucleusSegmentationAndAnalysisPlugin_.run(NucleusSegmentationAndAnalysisPlugin_.java:63)
at ij.IJ.runUserPlugIn(IJ.java:217)
at ij.IJ.runPlugIn(IJ.java:181)
at ij.Executer.runCommand(Executer.java:137)
at ij.Executer.run(Executer.java:66)
at java.lang.Thread.run(Thread.java:745)