Table 6.

Comparison between the recognition method suggested by this study and methods of other preceding studies (N.R. means, “not reported”).

Method	EER (%)	d-Prime Value
Szewczyk et al.’s [29] method	N.R.	1.09
Li et al.’s [30] method		1.32
De Marsico et al.’s [31] method	25.8 * (approximate value)	1.48
Li et al.’s [32] method	N.R.	1.58
Sajjad et al.’s [33] method	18.82	N.R.
Shin et al.’s [35] method	16.94	1.64
Santos et al.’s [36] method	18.48	1.74
Wang et al.’s [37] method	19.1 ** (approximate value)	2.28
Proença et al.’s [40] method	16 (approximate value)	2.42 (approximate value)
Tan et al.’s [38] method	12 *** (approximate value)	2.57
Proposed method	10.36	2.62

*, ** and ***: reported in the study by Proença et al. [40].