Table 4.

Mean NME for various models. Best performance is highlighted in bold.

Methodology	Mean NME
Proposed 2-input Method	0.0190
3DDFA_V2 [19]	0.0193
PRN [4]	0.0204
VRN_Guided [16]	0.0286
Proposed 1-input Method	0.0310
3DDFA [18]	0.0346