Ant Colony Optimization Approaches to Clustering of Lung Nodules from CT Images

Algorithm 3

Global region based segmentation algorithm.

Input: Lung CT image.

Output: Edge detected image using Global region based segmentation algorithm.

begin

Label seed points according their initial groping

 Put neighbours of seed points (the initial ) in the Sequentially Sorted List (SSL).

  While the SSL is not empty

   Remove first point from SSL.

   Test the neighbours of this point:

   if all neighbours of which are already labelled (other than with the boundary label) have

    The same label—set to this label.

    Update running mean of corresponding region add neighbours of which are neither

    already set nor already in the SSL to the SSL according to their value of

   otherwise

    flag with the boundary label

   end if

   end while

end