Table 2: Mapping among QoE metrics (SSIM, PSNR, VQM, and MOS) [16].

MOSPSNR (dB)SSIMVQM

5 (excellent) ≥37≥0.93<1.1
4 (good)≥31–<37≥0.85–<0.93≥1.1–<3.9
3 (fair)≥25–<31≥0.75–<0.85≥3.9–<6.5
2 (poor)≥20–<25≥0.55–<0.75≥6.5–<9
1 (bad)<20<0.55≥9