The texture features computed from GLCMs.

The middle column shows the original definitions, and the right column shows the modifications needed to make the features invariant to the number of gray-levels. There was an error in the definition of Sum variance in Haralick et al. [4], which has been corrected. λ2(Q(i, j)) denotes the second largest eigenvalue of a matrix Q(i, j). Note, however, that this feature is computationally unstable, and was therefore not included in the examples in this work. For symmetric GLCMs, μx and μy is identical, and is represented by μ in the expression for Cluster prominence and Cluster shade.