Table 2 Objective evaluation of proposed approach
Measure/Statistics | GrayWorld | Retinex | Histogram stretch | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Y Channel | V Channel | Y Channel | V Channel | Y Channel | V Channel | ||||||||
Gauss. G1 | Mean G2 | Gauss. G3 | Mean G4 | Gauss. G5 | Mean G6 | Gauss. G7 | Mean G8 | Gauss. G9 | Mean G10 | Gauss. G11 | Mean G12 | ||
PSNR | \(\bar{X}\) | 8.0598 | 8.1130 | 8.0096 | 8.0603 | 7.0912 | 7.2380 | 7.2193 | 7.3628 | 7.9911 | 8.0472 | 7.9899 | 8.0395 |
s | 1.3808 | 1.3611 | 1.3914 | 1.3781 | 1.0045 | 1.0051 | 1.0499 | 1.0480 | 1.3433 | 1.3270 | 1.1182 | 1.1041 | |
SSIM | \(\bar{X}\) | 0.1763 | 0.1756 | 0.1744 | 0.1739 | 0.1667 | 0.1672 | 0.1681 | 0.1684 | 0.1757 | 0.1750 | 0.1765 | 0.1759 |
s | 0.0364 | 0.0367 | 0.0382 | 0.0384 | 0.0297 | 0.0298 | 0.0301 | 0.0306 | 0.0361 | 0.0364 | 0.0329 | 0.0330 | |
FoM | \(\bar{X}\) | 0.5199 | 0.4801 | 0.4386 | 0.4395 | 0.4221 | 0.4228 | 0.4136 | 0.4161 | 0.4722 | 0.5103 | 0.4445 | 0.4426 |
s | 0.0733 | 0.0723 | 0.0744 | 0.0743 | 0.0974 | 0.0943 | 0.0977 | 0.0949 | 0.0727 | 0.0718 | 0.0758 | 0.0751 | |