What is setNumThreads for?

[berak]

opencv applies internal parallelization to speed up various functions, and setNumThreads() controls, how many threads to use for this (e.g. set it to 1 for debugging)

@Kansai

anything to do with if I decided std::thread in my application?

no, not at all, it’s for the internal library functions

@Kansai

A simple sample code would be handy too

there’s a tutorial with sample code