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Firstly please don't use C interface in iOS environment. C++ environment is more convenient.

It is possible to use C interface. Please add more headers with _c appendix:

#include "opencv2/imgproc/types_c.h" 
#include "opencv2/imgproc/impgroc_c.h"
....

Recommended way is to use the following header:

#ifdef __cplusplus
#include <opencv2 opencv.hpp="">
#endif