How to Compile OpenCV 3.0+ nonfree part from source
By default, nofree code does not ship with the default OpenCv installation, learn how to install nonfree code
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Compile OpenCV 3.2 with Java and use it in IntelliJ IDEA
If you are wishing to compile OpenCV 3.2 by your own with Java support, possibly this will help. Also it is for you if, done that, you want to use it in IntelliJ IDEA. Let's start!