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Как я понял, одна из фаз
Submitted by vinst on Fri, 09/25/2009 - 13:55.

Как я понял, одна из фаз такая.
forall i, j
old = img[ i*n + j ]
new = min( neighborhood( i, j ) )
img[ i*n j ] = new
if( i*n + j != old )
img[ old ] = new -- фишка здесь!

вторая фаза - обновление эквивалентностей (a-b-c-d = a-d, b-d, c-d).

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