bwlabel via disjoint set

simple cpp codes to label objects in 2D binary image

This file adapt a state of art structure 'disjoint set' to label objects in an binary
2D image. Which have similar effect as the matlab function 'bwlabel' in case of 8-connected
objects.
%please run the following commands to duplicate the screen shot:
mex vcBwlable.cpp %compile the cpp file
im = imread('coins.png');
L = djs_bwlable(im2bw(im));
%reference
syllabus about Disjoint set:
http://www.google.com.hk/url?sa=t&rct=j&q=disjoint+set&source=web&cd=4&ved=0CDwQFjAD&url=http%3A%2F%2Fwww.cs.iupui.edu%2F~xkzou%2Fteaching%2FCS580%2FDisjointSets.ppt&ei=vlEaT_iSKuWTiQfym6T3Cw&usg=AFQjCNG4v--8rDjH2j1f620owySUkZcRyA