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You should be able cross-compile opencv for vxworks-powerpc (the hard part), then use either opencv's java wrapper (which may or may not work) or JNA (which should work as that is what is used to call the NI vision lib) to call into the opencv library.

EDIT: also, if you want to stick with the NI vision lib but need a function C++ has that isn't exposed to Java, you can add a JNA wrapper for it.