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Convert the Mask to labelled connex regions. Pixel in each region is given a common integer value, the region number. Region numbers are ordered by decreasing number of pixels.
*** Caution: currently only works on 2-D masks. ***
For 3-D masks, the first plane is the result of collapsing the 3-D mask on it, and then applying the labelling process. This may change according to further needs.