Interactive image segmentation using GraphCut
GrabCut is an improved image segmentation algorithm , which is based on graph cut theory.
It only needs a small amount of user interaction to get better segmentation results.

This demo uses the OpenCV library calling its grabcut algorithm interface to achieve grabcut image segmentation.
After drawing the frame, if you press the key 1, then split up.If you press the key 2 ,it can be saved,
and the mouse press can reselect the rectangle to re-segment.