26
Normalized Cut
Minimal cut favors cutting off small node groups,
so Shi proposed the normalized cut.
                       cut(A, B)         cut(A,b)
Ncut(A,B) =  -------------  +  -------------
                       asso(A,V)       asso(B,V)
asso(A,V) = å w(u,t)
                 uÎA, tÎV
How much is A connected
to the graph as a whole.
normalized
cut