Extract the Otsu method from MultilevelThresholding
Combine thresholding and MultilevelThresholding
Remove useless code
Change the procedure of RegionGrowing
1.It will only find the outer contour of all contours in the region.
2.The inner contours probably attaches to the outer contour, if it is nearby the outer contour.
3.It will find the area that is surrounded by the outer contour.