[Flags] public enum DrawMatchesFlags
Output image matrix will be created (Mat::create), i.e. existing memory of output image may be reused. Two source image, matches and single keypoints will be drawn. For each keypoint only the center point will be drawn (without the circle around keypoint with keypoint size and orientation).
Output image matrix will not be created (Mat::create). Matches will be drawn on existing content of output image.
For each keypoint the circle around keypoint with keypoint size and orientation will be drawn.
Single keypoints will not be drawn.