Table 1: Comparative table of the main QoE metrics.

MetricStandardClassEstimateType

PSNRObjectivePixel-by-pixel comparison between reference image and compressed image.FR

VQM
(Video Quality Metric)
NTIAObjectiveSequences are divided into temporal-space blocks. Calculate the orientation of each block using spatial luminance gradient. Score tends to 0 (best).
Assess blurring, global noise, block distortion, and color distortion
RR

SSIM
(Structural Similarity Index)
ObjectiveFind the mean, variance, and covariance within a frame and combine them in a distortion map. Use luminance, contrast, and structure similarity.
Use decimal value from 0 to 1 (high correlation with original picture).
FR

MOSITU-T P.800SubjectiveSubjective scale from 1 (poor) to 5 (good).NA