Region Merging

Region Merging

• This operation eliminates false boundaries and spurious regions by merging adjacent regions that belong to the same object.
• Merging schemes begin with a partition satisfying condition

• Then they proceed to fulfill condition by gradually merging adjacent image regions

• How to determine region similarity?

          - Based on the gray values of the regions.

          - Based on the weakness of boundaries between the regions.

• Region merging by removing weak edges.

          - The idea is to combine two regions if the boundary between them is weak.

          - A weak boundary is one for which the intensities on either side differ by less than some threshold. 

          - The relative lengths between the weak boundary and the region boundaries must be also considered.