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The C interface of OpenCV is nowadays a wrapper around the C++ core and calls these functions internally. However, there are some old functions that still use the pure C coe but this is not standard.

Thus, in many cases there is little difference in calling the C vs. the C++ version of a certain function.

The C interface of OpenCV is nowadays a wrapper around the C++ core and calls these functions internally. However, there are some old functions that still use the pure C coe code only but this is not standard.

Thus, in many cases there is little difference in calling the C vs. the C++ version of a certain function.