Review Article
A Survey of Standardized Approaches towards the Quality of Experience Evaluation for Video Services: An ITU Perspective
Table 5
DCR 5 level opinion scale.
| Rating | Meaning |
| 5 | Imperceptible | 4 | Perceptible but not annoying | 3 | Slightly annoying | 2 | Annoying | 1 | Very annoying |
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