Table 2 Subjective rating criterion for visual quality of an image pair
From: Prediction error preprocessing for perceptual color image compression
Subjective score | Description |
|---|---|
3 | The right one is much better than the left one |
2 | The right one is better than the left one |
1 | The right one is slightly better than the left one |
0 | The right one has the same quality as the left one |
-1 | The right one is slightly worse than the left one |
-2 | The right one is worse than the left one |
-3 | The right one is much worse than the left one |