Signature Verification

• M is the squared Mahalanobis distance• s represents the within-group covariance matrix• y is the vector of the means of the scores for agroup• x is the vector containing the individual scores of asample• In our work, a diagonal covariance matrix isassumedMahalanobis Distance• Introduced by P. C. Mahalanobis in 1936• A distance measure which utilizes thecorrelations between the features•− 1d M(x,y)=(x−y)′S(x−y)