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You are right, the structure is a standard vector containing a standard vector of cv::Point2f. And cv::Point2f is a 2D point with data type float. OpenCV has a template class for 2D points (see here). For convenience there are some aliases
typedef Point_<float> Point2f;
typedef Point_<int> Point2i;
typedef Point2i Point;
typedef Point_<double> Point2d;