KeyPoint 和 point2f相互转换

KeyPoint 转point2f

void KeyPointsToPoints(vector<KeyPoint> kpts, vector<Point2f> &pts)
{
	for (int i = 0; i < kpts.size(); i++) {
		pts.push_back(kpts[i].pt);
	}
}

point2f 转KeyPoint

void PointsToKeyPoints(vector<Point2f>pts,vector<KeyPoint> &kpts)
{
	for (size_t i = 0; i < pts.size(); i++) {
		kpts.push_back(KeyPoint(pts[i], 1.f));
	}
}