Why the function normalize(cvnormalize) can not be fund in the newest documents?

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Just to further explain it a bit, all the functions with the cv in front have the old depricated C - style API. OpenCV tries to push people to use the newer and more easier to handle C++ API, having the same functionality but without the cv in front of it most of the time. The C++ interface takes care of nasty things like pointers, memory management, ... Probably in the near feature the C-style API will dissappear completely.