... Recognition, pp 1309–1312, Brisbane Australia, 1998 [11] J Fierrez-Aguilar, L Nanni, J Lopez-Pe˜ alba, J Ortegan Garcia, and D Maltoni, “An on- line signature verification system based on fusion of local ... variability criteria were proposed for offline signature verification by a human expert A human operator labels signatures according to both criteria and their impact on performance is studied Also ... follow the same local paradigm, but we compute the time-normalized entropy of a signature sample Sample Entropy , namely, the average entropy per second of such sample, therefore quantified in...