//load ImageJ
%classpath config resolver scijava.public https://maven.scijava.org/content/groups/public
%classpath add mvn net.imagej imagej 2.0.0-rc-67

//create ImageJ object
ij = new net.imagej.ImageJ()

input = ij.scifio().datasetIO().open("http://imagej.net/images/abe.tif")
ij.notebook().display(input)

ij.op().help('gauss')

//sigmas for Gaussian
sigmas = [2, 2] as double[]

output = ij.op().filter().gauss(input, sigmas)

ij.notebook().display(output)