Three dimensional watershed transform





        6 neighborhood connectivity                       26 neighborhood connectivity

		Left image is a 64 x 64 x 16 grayscale image. It represents the gradient of a box that has a higher intensity section at the left upper corner. 3 D watershed transform segments the box as well as the section (over-segmentation).
		After imposing a background marker and an object marker (darker gray), 3D Meyer watershed is applied.  The section is not segmented as we expect.