How to merge regions.

 Hi Friends !
   I have the two mat files e and Oout. The mat file e for region adjacencies pairs and the Oout for class values.

Final classifion result of my system,

There are three classes in this system, Blue color represent for sky, Green color represent for tree and black color represent for road. However, there are many regions in Tree region. I want to merge these regions. If it has the same class value and adjacent. I have two mat files for regions adjacencies pairs and classes. However I don't know how to write matlab code to merge the two regions. Please give me some sample matlab code if ok.