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Table 3 Quantitative comparison for different EFs

From: A new evaluation function for face image enhancement in unconstrained environments using metaheuristic algorithms

Metrics

Munteanu + CSO (M_CSO)

Ye + CSO

Proposed + CSO

Im1

Im2

Im3

Im1

Im2

Im3

Im1

Im2

Im3

ϕ g

1867

1082

2301

762

927

1935

2104

1116

4827

N g

537

361

630

1314

1673

1719

2306

2057

3368

ρ g

14.9

13.3

17.0

17.7

15.7

17.8

14.5

13.8

12.9

β g

7.8

7.7

7.7

7.8

7.6

7.8

7.8

7.7

7.8

ξ

0.1

0.1

0.0

0.0

0.0

0.0

0.0

0.1

0.0

Ε

1.235

1.160

1.279

1.242

1.227

1.323

1.333

1.252

1.510