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cooccurrence homogeneity: what equation?

Could anybody please provide me with the equation of the "homogeneity"
(which is NOT the angular second moment!) texture feature, calculated on
the co-occurrence matrix by IDL-ENVI ?

This is stored in a .sav file, so I don't have access to it. The online
help says it has been based on the features of Haralick et al., 1973,
but this paper does not mention such a feature!

Thanks so much.

Tom Wassenaar
INRA Science du Sol, 2 place Pierre Viala
34060 Montpellier Cedex 02, tel. +33 (0)499612764
fax +33(0)467632614, Ml : wassenaar@ensam.inra.fr